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Analytical models for evaluating buoyancy-driven ventilation due to stack effect in a shaft considering heat transfer from shaft interior boundaries 认领 引用 被引量：2
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作者 YANG Dong LI Bai—zhan +1 位作者 DU Tao LI Nan 《Journal of Central South University》 SCIE EI CAS 2012年第3期651-656,共6页
Stack effect is a dominant driving force for building natural ventilation.Analytical models were developed for the evaluation of stack effect in a shaft,accounting for the heat transfer from shaft interior boundaries.... Stack effect is a dominant driving force for building natural ventilation.Analytical models were developed for the evaluation of stack effect in a shaft,accounting for the heat transfer from shaft interior boundaries.Both the conditions with constant heat flux from boundaries to the airflow and the ones with constant boundary temperature were considered.The prediction capabilities of these analytical models were evaluated by using large eddy simulation(LES)for a hypothetical shaft.The results show that there are fairly good agreements between the predictions of the analytical models and the LES predictions in mass flow rate,vertical temperatures profile and pressure difference as well.Both the results of analytical models and LES show that the neutral plane could locate higher than one half of the shaft height when the upper opening area is identical with the lower opening area.Further,it is also shown that the analytical models perform better than KLOTE's model does in the mass flow rate prediction. 展开更多
关键词 stack effect theoretical analysis large eddy simulation vertical temperature distribution heat transfer
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A simple plume model induced by stack effect in a vertical shaft 认领 引用
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作者 Zhang Jingyan Lu Weizhen Huo Ran 《Engineering Sciences》 2009年第3期35-40,共6页
After comparing the mechanism of tilted plume under stack effect with that of spill plume,the tilted plume model induced by stack effect in a vertical shaft is developed simply based on the theoretical results and a s... After comparing the mechanism of tilted plume under stack effect with that of spill plume,the tilted plume model induced by stack effect in a vertical shaft is developed simply based on the theoretical results and a series of full-scale tests. It is shown that the two sides of plume are symmetrical and have an accordant regulation that the plume radius has a linear relation to the height z. The profile of fire plume under stack effect is similar to the windblown flame in wind tunnel,and the range of flame deflection angle is about from 50 to 60 degree. 展开更多
关键词 stack effect tilted plume profile plume radius flame deflection angle air-entrainment
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Accessing the stack effect in high-rise buildings by the probability method based on climate demarcation:A case study in China 认领 引用
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作者 Chenkun Xie Yi Yang +5 位作者 Qiusheng Li Xianfeng Yu Zhihui Wang Baojun Bai Lijun Yuan Yanlong Guo 《Energy and Built Environment》 EI CSCD 2026年第3期519-533,共15页
The stack effect in super high-rise buildings is mainly influenced by the temperature difference between the indoor and outdoor environments,wind pressure,building height,and the airtightness of building components.Co... The stack effect in super high-rise buildings is mainly influenced by the temperature difference between the indoor and outdoor environments,wind pressure,building height,and the airtightness of building components.Consequently,the intensity and frequency of the stack effect are inherently impacted by regional and seasonal climate conditions.This study initially examines two critical meteorological elements-temperature and wind speed-that are closely related to the stack effect in high-rise buildings.Then the appropriate climate demarcation for evaluating the stack effect in high-rise buildings,which is based on the building climate demarcation in China is investigated,and the land area of China is divided into four climate regions for the purpose of stack effect assessment.Utilizing annual meteorological monitoring data from each region,the probability function models for temperature and wind speed are developed,and a joint probability distribution function for temperature and wind speed in each region is derived using a binary copula function.Finally,the probabilistic assessment of the stack effect under both pure and combined thermal pressures across different climatic zones is numerically investigated by employing a standardized high-rise building model.This research enables a refined assessment of the stack effect for high-rise building,and provides a useful reference to improve the design codes in future. 展开更多
关键词 Super high-rise buildings Stack effect Building climate demarcation Exceeding probability assessment Numerical simulation
Leakage Current Estimation of CMOS Circuit with Stack Effect 认领 引用 被引量：4
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作者 Yong-JunXu Zu-YingLuo +2 位作者 Xiao-WeiLi Li-JianLi Xian-LongHong 《Journal of Computer Science & Technology》 SCIE EI 2004年第5期708-717,共10页
Leakage current of CMOS circuit increases dramatically with the technologyscaling down and has become a critical issue of high performance system. Subthreshold, gate andreverse biased junction band-to-band tunneling (... Leakage current of CMOS circuit increases dramatically with the technologyscaling down and has become a critical issue of high performance system. Subthreshold, gate andreverse biased junction band-to-band tunneling (BTBT) leakages are considered three maindeterminants of total leakage current. Up to now, how to accurately estimate leakage current oflarge-scale circuits within endurable time remains unsolved, even though accurate leakage modelshave been widely discussed. In this paper, the authors first dip into the stack effect of CMOStechnology and propose a new simple gate-level leakage current model. Then, a table-lookup basedtotal leakage current simulator is built up according to the model. To validate the simulator,accurate leakage current is simulated at circuit level using popular simulator HSPICE forcomparison. Some further studies such as maximum leakage current estimation, minimum leakage currentgeneration and a high-level average leakage current macromodel are introduced in detail.Experiments on ISCAS85 and ISCAS89 benchmarks demonstrate that the two proposed leakage currentestimation methods are very accurate and efficient. 展开更多
关键词 computer-aided design leakage current estimation stack effect macromodeling propagation of signal probability
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Basal-plane stacking-fault energies of Mg alloys: A first-principles study of metallic alloying effects 认领 引用 被引量：13
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作者 Qing Dong Zhe Luo +6 位作者 Hong Zhu Leyun Wang Tao Ying Zhaohui Jin Dejiang Li Wenjiang Ding Xiaoqin Zeng 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第10期1773-1780,共8页
Generalized stacking-fault energies （GSFEs） of basal-plane stacking faults 11 and 12 in Mg alloys have been studied based on first-principles calculations, where 43 alloying elements were considered. It is found tha... Generalized stacking-fault energies （GSFEs） of basal-plane stacking faults 11 and 12 in Mg alloys have been studied based on first-principles calculations, where 43 alloying elements were considered. It is found that the most contributing features of alloying elements to GSFEs are bulk modulus, equilibrium volume, binding energy, atomic radius and ionization energy. Both bulk modulus and ionization energy exhibit positive relationships with GSFEs, and the others show opposite relationships. Multiple regressions have been performed to offer a quantitative prediction for basal-plane GSFEs in Mg-X systems. GSFEs, alloying effects of elements and the prediction model established within this work may provide guidelines for new Mg alloys design with better ductility. 展开更多
关键词 First-principles calculations Magnesium alloys Stacking-fault energy Alloying effect
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Oxygen Scavenging Effect of LaLuO_3/TiN Gate Stack in High-Mobility Si/SiGe/SOI Quantum-Well Transistors 认领 引用
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作者 冯锦锋 刘畅 +1 位作者 俞文杰 彭颖红 《Chinese Physics Letters》 SCIE EI CAS CSCD 2016年第5期108-110,共3页
Higher-s dielectric LaLuO3, deposited by molecular beam deposition, with TiN as gate stack is integrated into high-mobility Si/SiGe/SOI quantum-well p-type metal-oxide-semiconduetor field effect transistors. Threshold... Higher-s dielectric LaLuO3, deposited by molecular beam deposition, with TiN as gate stack is integrated into high-mobility Si/SiGe/SOI quantum-well p-type metal-oxide-semiconduetor field effect transistors. Threshold voltage shift and capacitance equivalent thickness shrink are observed, resulting from oxygen scavenging effect in LaLuO3 with ti-rich TiN after high temperature annealing. The mechanism of oxygen scavenging and its potential for resistive memory applications are analyzed and discussed. 展开更多
关键词 SOI SiGe TiN Oxygen Scavenging Effect of LaLuO3/TiN Gate Stack in High-Mobility Si/SiGe/SOI Quantum-Well Transistors of in Gate
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Synergistic Effect of Alloying Atoms on Intrinsic Stacking-Fault Energy in Austenitic Steels 认领 引用 被引量：2
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作者 Ling-Hong Liu Tou-Wen Fan +3 位作者 Cui-Lan Wu Pan Xie Ding-Wang Yuan Jiang-Hua Chen 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2017年第3期272-279,共8页
Intrinsic stacking-fault energy is a critical parameter influencing the various mechanical performances of aus- tenitic steels with high Mn concentrations. However, quantitative calculations of the stacking-fault ener... Intrinsic stacking-fault energy is a critical parameter influencing the various mechanical performances of aus- tenitic steels with high Mn concentrations. However, quantitative calculations of the stacking-fault energy （SFE） of the face-centered cubic （fcc） Fe, including the changes in concentrations and geometrical distribution of alloying atoms, cannot be obtained by using previous computation models. On the basis of the interaction energy model, we evaluated the effects of a single alloying atom （i.e., Mn, A1, Si, C and N）, as well as its aggregates, including the Mn-X dimer and Mn2-X trimer （X = A1, Si, C and N） on the SFE of the fcc Fe via first-principle calculations. Given low concentrations （〈10 wt%） of alloying atoms, dimers and trimers, theoretical calculations reveal the following： （1） Alloying atom Mn causes a decrease in the SFE, whereas A1, Si, C and N significantly increase the SFE; （2） combination with other alloying atoms to form the Mn-X dimer （X = A1, Si, C and N） exerts an effect on SFE that, to a certain extent, is close to that of the corresponding single X atom; （3） the interaction between Mnz-X and the stacking fault is stronger than that of the corresponding single X atom, inducing a significant increase in the SFE of fcc Fe. The theoretical results we obtained demonstrate that the increase in SFE in high-Mn steel originates from the synergistic effect of Mn and other trace alloy atoms. 展开更多
关键词 Stacking-fault energy Synergism First-principle calculation Austenitic steel Alloying effect
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STUDY ON THE STABILITY AND STACKING INTERACTION EFFECT OF THE TERNARY M(Ⅱ)(ATP)AND PYRIDINE-LIKE LIGANDS 认领 引用
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作者 Bin SONG Jie ZHANG Fu Hai WU Liang Nian JI Biotechnology Research Center,Chemistry Department Zhongshan University,Guangzhou 510275 《Chinese Chemical Letters》 SCIE EI CAS 1993年第12期1097-1100,共4页
The stabilities of the complexes of three pyridine-like ligands with M(II)(ATP)2- and M(II)(M=Ni,Co)were studied by spectrophotometry and by comparing the stability constants of the ternary complexes with these of ... The stabilities of the complexes of three pyridine-like ligands with M(II)(ATP)2- and M(II)(M=Ni,Co)were studied by spectrophotometry and by comparing the stability constants of the ternary complexes with these of the binary complexes.A stacking interaction between the pyridine ring and the purine ring of ATP is indicated.The general existence of the stacking interaction encourages us to interpret the antitumor mechanism of a new class of antitumor drugs. 展开更多
关键词 ATP)AND PYRIDINE-LIKE LIGANDS STUDY ON THE STABILITY AND STACKING INTERACTION EFFECT OF THE TERNARY M
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潮热地区变电站10 kV配电装置室凝露机理分析与综合防治 认领 引用
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作者 张俊康 沈谢林 +2 位作者 杨冬明 张少莹 郑昕泽 《电气技术》 2026年第6期54-59,共6页
针对福建泉州某220 kV变电站10 kV配电装置室母线桥局部放电及金属构件锈蚀问题,通过现场测试与理论分析,揭示了凝露形成的根本机理——建筑封堵不严与通风控制缺失耦合,在垂直相邻空间形成热力烟囱效应主导的空气对流,致使高含湿量的... 针对福建泉州某220 kV变电站10 kV配电装置室母线桥局部放电及金属构件锈蚀问题,通过现场测试与理论分析,揭示了凝露形成的根本机理——建筑封堵不严与通风控制缺失耦合,在垂直相邻空间形成热力烟囱效应主导的空气对流,致使高含湿量的热空气持续接触低温设备表面并冷凝。基于湿空气热力学理论解析传热传质过程,通过露点计算定量验证凝露发生的必然性。提出以“封堵隔离为基础、温湿度协同调控为核心、智能监测为保障”的综合治理方案,通过建筑气密性改造和空调-除湿机联动控制,实现环境露点的精确管理。工程应用表明,该方法可有效防范凝露与放电隐患,治理后装置室相对湿度稳定控制在(50±5)%范围内,为潮热地区变电站的防潮设计与运维提供了可靠解决方案。 展开更多
关键词 变电站 凝露 热力烟囱效应 传热传质 露点温度 综合治理
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关于垂直堆叠芯片的单粒子效应地面试验预计方法研究 认领 引用
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作者 郭啸 王奇 +3 位作者 郭春成 王朝旭 王丹 张涛 《固体电子学研究与进展》 CAS 2026年第3期41-46,共6页
介绍了垂直堆叠芯片单粒子效应地面试验预计方法,通过一种背面减薄方法,解决一款宇航用垂直堆叠芯片在单粒子效应地面试验中的难点,使其地面试验得以顺利进行,获得了该芯片的主要单粒子事件参数,包括单粒子翻转饱和截面、线性能量传输... 介绍了垂直堆叠芯片单粒子效应地面试验预计方法,通过一种背面减薄方法,解决一款宇航用垂直堆叠芯片在单粒子效应地面试验中的难点,使其地面试验得以顺利进行,获得了该芯片的主要单粒子事件参数,包括单粒子翻转饱和截面、线性能量传输阈值。根据故障定位,该款垂直堆叠芯片抗单粒子翻转能力薄弱点为上层硅互补金属氧化物半导体(Complementary metal oxide semiconductor,CMOS)波控芯片锁存器IP单元。本研究形成了一套通用的垂直堆叠芯片单粒子效应地面试验预计方案,可为高可靠高密度宇航集成电路研制提供有力保障。 展开更多
关键词 垂直堆叠芯片 单粒子效应 地面试验 单粒子事件截面 线性能量传输阈值
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Predicting air pressure in drainage stack of high-rise building 认领 引用 被引量：2
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作者 E. S. W. WONG 李应林 朱祚金 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2013年第3期351-362,共12页
It is necessary to understand the features of air pressure in a drainage stack of a high-rise building for properly designing and operating a drainage system. This paper presents a mathematical model for predicting th... It is necessary to understand the features of air pressure in a drainage stack of a high-rise building for properly designing and operating a drainage system. This paper presents a mathematical model for predicting the stack performance. A step function is used to describe the effect of the air entrainment caused by the water discharged from branch pipes. An additional source term is introduced to reflect the gas-liquid interphase interaction （GLII） and stack base effect. The drainage stack is divided into upper and base parts. The air pressure in the upper part is predicted by a total variation diminishing （TVD） scheme, while in the base part, it is predicted by a characteristic line method （CLM）. The predicted results are compared with the data measured in a real-scale high- rise test building. It is found that the additional source term in the present model is effective. It intensively influences the air pressure distribution in the stack. The air pressure is also sensitive to the velocity-adjusting parameter （VAP）, the branch pipe air entrainment, and the conditions on the stack bottom. 展开更多
关键词 air pressure in drainage stack characteristic line method stack base effect,interphase interaction
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A two-dimensional analytical modeling for channel potential and threshold voltage of short channel triple material symmetrical gate Stack(TMGS) DG-MOSFET 认领 引用
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作者 Shweta Tripathi 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第10期518-524,共7页
In the present work, a two-dimensional（2D） analytical framework of triple material symmetrical gate stack（TMGS）DG-MOSFET is presented in order to subdue the short channel effects. A lightly doped channel along wit... In the present work, a two-dimensional（2D） analytical framework of triple material symmetrical gate stack（TMGS）DG-MOSFET is presented in order to subdue the short channel effects. A lightly doped channel along with triple material gate having different work functions and symmetrical gate stack structure, showcases substantial betterment in quashing short channel effects to a good extent. The device functioning amends in terms of improved exemption to threshold voltage roll-off, thereby suppressing the short channel effects. The encroachments of respective device arguments on the threshold voltage of the proposed structure are examined in detail. The significant outcomes are compared with the numerical simulation data obtained by using 2D ATLAS;device simulator to affirm and formalize the proposed device structure. 展开更多
关键词 triple material symmetrical gate stack(TMGS) DG MOSFET gate stack short channel effect drain induced barrier lowering threshold voltage
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临南洼陷新生界火山岩储层发育特征及有利目标预测 认领 引用
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作者 李翔 张健 +1 位作者 王月皎 白万奎 《复杂油气藏》 2026年第2期144-151,共8页
在火成岩发育区,由于各种原因造成地震记录杂乱无规律,地震资料对储层厚度和岩性边界分辨能力受限,有效储层难以分辨识别。以临南洼陷为例,结合岩心、测井曲线及地震资料,开展火成岩地层对比、期次划分和层位解释工作,实现了对火成岩6... 在火成岩发育区,由于各种原因造成地震记录杂乱无规律,地震资料对储层厚度和岩性边界分辨能力受限,有效储层难以分辨识别。以临南洼陷为例,结合岩心、测井曲线及地震资料,开展火成岩地层对比、期次划分和层位解释工作,实现了对火成岩6种亚相的识别划分,对侵入岩4个不同期次的准确追踪和对火山锥体的精细刻画;同时,对侵入岩储集空间类型进行评价分析,划分临南洼陷有效储集空间,针对研究区内储油性能最好的S741井区开展叠前五维裂缝预测工作,裂缝预测与侵入岩钻遇井试油数据对应率达86%。结合测井资料与区域地质特征对研究区内侵入岩开展储层综合评价,共优选出11个Ⅰ类圈闭、13个Ⅱ类圈闭和有利分布区域55 km2,并提出有利目标和部署建议。 展开更多
关键词 火成岩 岩相识别 有效储集空间 叠前五维裂缝预测 侵入岩储层综合评价 临南洼陷
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基于电磁超声的铁质文物特征提取方法研究 认领 引用
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作者 姚恩涛 路璐 +1 位作者 石玉 王平 《测控技术》 2025年第2期18-25,共8页
传统文物鉴定通常凭借个人经验,从文物材质、外观等方面着手,对文物真伪进行鉴定,该方法存在一定的局限性。针对铁质文物,根据材料的磁致伸缩特性取决于材料的微观结构的特点,利用具有磁致伸缩效应的电磁超声检测其特征参数,提出了一种... 传统文物鉴定通常凭借个人经验,从文物材质、外观等方面着手,对文物真伪进行鉴定,该方法存在一定的局限性。针对铁质文物,根据材料的磁致伸缩特性取决于材料的微观结构的特点,利用具有磁致伸缩效应的电磁超声检测其特征参数,提出了一种铁质文物的特征参数提取方法;利用电磁超声信号幅值随偏置磁场强度变化曲线,通过堆叠稀疏自编码器提取该曲线的特征参数用于文物的特征表达,并使用支持向量机(Support Vector Machine, SVM)分类算法进行辨识。采用该方法对3个不同的样件进行了实验验证,检测准确率达到93.3%,表明该方法对铁质文物的鉴定具有可行性。 展开更多
关键词 电磁超声 铁质文物 堆叠稀疏自编码器 磁致伸缩效应
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层错能对中锰钢包辛格效应的影响 认领 引用
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作者 冯毅 蔡志辉 +2 位作者 王辉 黄光杰 马鸣图 《机械工程材料》 CAS CSCD 北大核心 2025年第7期58-63,共6页
通过调整碳、锰和铝含量获得层错能分别为16,63 mJ·m-2的2种中锰钢,采用1次拉-压加载试验研究了不同加载工况(拉伸/压缩应变分别为4%/8%,6%/10%,8%/12%)下层错能对包辛格效应的影响。结果表明:不同加载工况下,较大层错能中锰钢... 通过调整碳、锰和铝含量获得层错能分别为16,63 mJ·m-2的2种中锰钢,采用1次拉-压加载试验研究了不同加载工况(拉伸/压缩应变分别为4%/8%,6%/10%,8%/12%)下层错能对包辛格效应的影响。结果表明:不同加载工况下,较大层错能中锰钢的压缩屈服强度降低比率(拉压屈服强度差与拉伸屈服强度之比)和包辛格应力参数(最大应力与压缩屈服强度差的绝对值与最大应力之比)均较小,包辛格比(最大应力与压缩屈服强度差的绝对值和最大应力与拉伸屈服强度差的绝对值之比)较大,背应力较小,相间塑性应变不兼容水平较低,包辛格效应较弱;随着拉伸/压缩应变增加,较小层错能中锰钢的包辛格效应增强,较大层错能中锰钢的包辛格效应几乎不变,对应变不敏感。 展开更多
关键词 中锰钢 包辛格效应 背应力 层错能 相间应力
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基于快循环同步加速器的闪疗束流配送系统 认领 引用
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作者 史莹 张满洲 +2 位作者 李德明 韩学健 孙培涵 《强激光与粒子束》 CAS CSCD 北大核心 2025年第8期92-100,共9页
为了实现超高剂量率的质子Flash照射,基于快循环同步加速器建立了一个束流配送系统。快循环同步加速器能够在数百ns内快速引出质子束,通过改变不同的引出时间引出不同能量的束流,从而实现能量的快速切换。基于这个特性,考虑与层叠加照... 为了实现超高剂量率的质子Flash照射,基于快循环同步加速器建立了一个束流配送系统。快循环同步加速器能够在数百ns内快速引出质子束,通过改变不同的引出时间引出不同能量的束流,从而实现能量的快速切换。基于这个特性,考虑与层叠加照射方式相结合,束流的瞬时剂量率可以达到10~7 Gy/s。靶区在纵向上分成单独的层,每一层需要不同的能量。由于能量层切换的时间非常短,射程调制轮无法满足需求,选用纹波过滤器进行射程调制。使用蒙特卡罗软件FLUKA模拟了整个装置,包括了散射片,射程补偿器,纹波过滤器和准直器,最大化提高进入靶区的质子通量。在低、中、高三个能量区域,根据原始布拉格峰曲线设计了3种尺寸的纹波过滤器,将尖峰区域扩展成高斯分布,分别提供了2、6、13 cm宽度的3个扩展布拉格峰区域,有效减少了能量层数量,缩短了整体照射时间。将快循环同步加速器与层叠加的照射方式相结合,可以获得超高瞬时剂量率的照射野,为实现Flash照射提供了一种新的方法。 展开更多
关键词 质子治疗 Flash效应 束流配送系统 层叠加 快循环同步加速器
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基于桩周土围限失效的筋箍料粒桩复合地基承载力计算 认领 引用 被引量：3
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作者 龙军 彭搏程 《公路工程》 2025年第1期138-143,共6页
探讨分析了筋箍料粒桩(GEGC)及其复合地基的加固机理,基于此,针对筋箍料粒桩竖向受荷后的鼓胀变形特性及复合地基桩土共同承担荷载特性,从桩周土对料粒桩围限失效的角度出发,取单桩及有效加固范围内桩周土形成的典型单元体为分析对象,采... 探讨分析了筋箍料粒桩(GEGC)及其复合地基的加固机理,基于此,针对筋箍料粒桩竖向受荷后的鼓胀变形特性及复合地基桩土共同承担荷载特性,从桩周土对料粒桩围限失效的角度出发,取单桩及有效加固范围内桩周土形成的典型单元体为分析对象,采用Vesic圆孔扩张理论,综合考虑桩间土侧向约束效应、桩间土堆载效应、筋材环箍效应对筋箍料粒桩承载力的影响,导出了筋箍料粒桩单桩承载力计算公式,进而得到了基于桩周土围限失效的筋箍料粒桩复合地基承载力确定方法。最后通过与高速公路筋箍碎石桩复合地基现场载荷试验结果的对比分析,验证了承载力计算方法的可行性。 展开更多
关键词 复合地基 筋箍料粒桩 承载力 侧向约束效应 堆载效应 水平摩阻效应
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南天山西段乌恰构造带堆垛构造变形及应力数值模拟分析 认领 引用 被引量：1
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作者 罗强 赵振伟 +6 位作者 刘畅 吴育林 陈九洲 黄天 王锦洲 张昭坤 陈友智 《地质科学》 CAS CSCD 北大核心 2025年第5期1259-1270,共12页
构造变形中“堆垛构造”是对逆冲岩片垂向叠置的形态描述,缺少明确的运动学含义和地质意义。南天山西段乌恰构造带堆垛构造中二叠系—石炭系获得勘探突破,表明堆垛构造为良好的勘探目标。但受限于地震资料分辨率的影响,其内部应力状态... 构造变形中“堆垛构造”是对逆冲岩片垂向叠置的形态描述,缺少明确的运动学含义和地质意义。南天山西段乌恰构造带堆垛构造中二叠系—石炭系获得勘探突破,表明堆垛构造为良好的勘探目标。但受限于地震资料分辨率的影响,其内部应力状态、圈闭有效性等无法判断。本文结合地震、钻井和测井资料,通过数值模拟的手段,来表征乌恰构造带堆垛构造发育过程、变形机制和应力状态,为此类构造的油气勘探开发提供理论依据。研究获得以下认识:1)过乌恰背斜剖面构造缩短率为42.7%,不考虑剥蚀作用情况下,山根最大隆升幅度达125%,先存构造对堆垛构造形成起主要控制作用。2)颗粒流PFC2D 5.0数值模拟技术分析乌恰构造附近堆垛构造处变形机制,最开始为简单剪切;之后垂向上变形机制分化,上部为纯剪切和亚简单剪切,下部为简单剪切;然后,又转变为以简单剪切作用为主导;最后主要受控于刚性旋转作用。3)Abaqus有限元模拟发现存在先存构造的情况下,堆垛构造下部第二排背斜应力作用较强,油气圈闭易被断裂破坏。乌恰背斜石炭系裂缝由下至上分别受到纯剪切、垂向拉伸、简单剪切作用,表明其复杂的变形过程。 展开更多
关键词 南天山 塔里木 乌恰构造带 堆垛构造 运动学 变形机制 应力 圈闭有效性
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北京市昌平区突发地质灾害隐患发育特征与成因分析研究 认领 引用 被引量：2
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作者 王惠芬 《城市地质》 2025年第4期483-491,共9页
昌平区位于北京西北部平原与山区接合带,地貌多样、岩层结构复杂、构造活跃,崩塌、滑坡和泥石流等地质灾害隐患发育。文章采用空间相关性分析、多因子叠加分析等方法,结合区域地质条件及“23·7”强降雨灾害案例,系统分析灾害隐患... 昌平区位于北京西北部平原与山区接合带,地貌多样、岩层结构复杂、构造活跃,崩塌、滑坡和泥石流等地质灾害隐患发育。文章采用空间相关性分析、多因子叠加分析等方法,结合区域地质条件及“23·7”强降雨灾害案例,系统分析灾害隐患发育特征与成因。结果表明:截至2024年5月,昌平区灾害隐患点集中分布于西北部8个乡镇,规模以小型为主(占96.15%),主要为崩塌灾害(占90.32%),其多发育在丘陵褶皱或断层破碎带。地形地貌、工程岩组、地质构造为灾害隐患的内在控制因素,隐患点高度集中于低山丘陵、坚硬/较坚硬岩组与断裂带附近;强降雨是关键诱发因素;修路、建房切坡等人类工程活动加剧隐患形成。基于易发性分析,提出差异化分级防控对策,为区域精准防控提供技术支撑。 展开更多
关键词 地质灾害 发育特征 成因分析 叠加效应 防控对策
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地铁叠落隧道群洞施工扰动效应分析及控制案例研究 认领 引用
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作者 姚三瑞 王炜 姚爱军 《现代城市轨道交通》 2025年第4期32-39,共8页
针对苏州地铁8号线小径距叠落临近既有地铁3号线隧道的复杂工况,采用有限元数值模拟和现场监测相结合的方法,系统分析群洞型地铁叠落隧道施工对既有隧道及周边地层的扰动效应。研究结果表明,8号线施工引起的地表沉降最大值达13.73 mm,... 针对苏州地铁8号线小径距叠落临近既有地铁3号线隧道的复杂工况,采用有限元数值模拟和现场监测相结合的方法,系统分析群洞型地铁叠落隧道施工对既有隧道及周边地层的扰动效应。研究结果表明,8号线施工引起的地表沉降最大值达13.73 mm,且沉降曲线呈V型叠加;既有3号线隧道受扰动较小,变形控制在1 mm以内;8号线右线上穿左线过程中,左线衬砌变形显著,拱顶和拱底变形分别达到-13.16 mm和-12.99 mm。针对上述扰动,提出上下层隧道夹层注浆加固和隧道布设支撑台车的控制措施,可有效减小衬砌变形和地表沉降。相关研究成果可为类似群洞型叠落隧道的设计与施工提供参考和借鉴。 展开更多
关键词 地铁 叠落隧道 隧道群洞效应 衬砌变形 地表沉降 变形控制
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