Rock slope instability is a prevalent geological hazard that imposes significant adverse impacts on engineering activities.Although existing studies have focused on homogeneous rock slopes,the theoretical models for q...Rock slope instability is a prevalent geological hazard that imposes significant adverse impacts on engineering activities.Although existing studies have focused on homogeneous rock slopes,the theoretical models for quantifying the stability of softhard interbedded anti-inclined slopes remain underdeveloped,primarily due to the complex force transfer mechanisms involved.This study proposed a novel theoretical model for the stability analysis of soft-hard interbedded anti-inclined slopes under rainfall conditions.The framework models stratified rock layers as layered cantilever beams with material heterogeneity.Based on the principle of deformation compatibility,it comprehensively accounted for interlayer force transfer and strength degradation resulting from differential deformations among rock layers.Furthermore,it integrated the critical instability length induced by the self-weight of rock layers to determine the fracture depth.The proposed method was validated against engineering case studies and physical model tests,with error falling within an acceptable range.Compared to existing theoretical methods,the proposed method provided a more realistic representation of the slope's stress field.The analysis results demonstrate that rainfall not only reduces the inclination angle of the failure surface but also leads to an approximate 30%decrease in the safety factor.The proposed theoretical model is particularly useful for quickly calculating the stability of soft-hard interbedded anti-inclined rock slope under rainfall conditions,compared to complex and time-consuming numerical simulation calculations.展开更多
Introducing strong radiative impurities as an important way to mitigate the peak heat load will be employed in EAST for high power long pulse experiments were explored under both low(L)and the first time in EAST,with ...Introducing strong radiative impurities as an important way to mitigate the peak heat load will be employed in EAST for high power long pulse experiments were explored under both low(L)and the first time in EAST,with the injection of argon into divertor plasmas has been considered at the divertor target plate for ITER,and operations.To this end,radiative divertor high(H)-mode confinement regimes,for and its mixture(25%Ar in D2).The Ar injection greatly reduced particle and heat fluxes to the divertor in L-mode discharges,achieving nearly complete detached divertor plasma regimes for both single null(SN)and double null(DN)configurations,without increasing the core impurity content.In particular,the peak heat flux was reduced by a factor of~6~significantly reducing the intrinsic in-out divertor asymmetry for DN,as seen by both the new infra-red camera and the Langmuir probes at the divertor target.Promising results have also been obtained in the H-modes with argon seeding,demonstrating a significant increase in the frequency and decrease in the amplitude of the edge localized modes(ELMs),thus reducing both particle and heat loads caused by the ELMs.This will be further explored in the next experimental campaign with increasing heating power for long pulse operations.展开更多
基金supported by the Chongqing Water Conservancy Science and Technology Project(grant number:CQSLK-202329)the Natural Science Foundation of Chongqing,China(grant number:CSTB2022NSCQ-MSX0991)+1 种基金the National Natural Science Foundation of China(grant number:52378327)the Chongqing Natural Science Foundation Innovation Development Joint Fund(grant number:CSTB2022NSCQ-LZX0049)。
摘要Rock slope instability is a prevalent geological hazard that imposes significant adverse impacts on engineering activities.Although existing studies have focused on homogeneous rock slopes,the theoretical models for quantifying the stability of softhard interbedded anti-inclined slopes remain underdeveloped,primarily due to the complex force transfer mechanisms involved.This study proposed a novel theoretical model for the stability analysis of soft-hard interbedded anti-inclined slopes under rainfall conditions.The framework models stratified rock layers as layered cantilever beams with material heterogeneity.Based on the principle of deformation compatibility,it comprehensively accounted for interlayer force transfer and strength degradation resulting from differential deformations among rock layers.Furthermore,it integrated the critical instability length induced by the self-weight of rock layers to determine the fracture depth.The proposed method was validated against engineering case studies and physical model tests,with error falling within an acceptable range.Compared to existing theoretical methods,the proposed method provided a more realistic representation of the slope's stress field.The analysis results demonstrate that rainfall not only reduces the inclination angle of the failure surface but also leads to an approximate 30%decrease in the safety factor.The proposed theoretical model is particularly useful for quickly calculating the stability of soft-hard interbedded anti-inclined rock slope under rainfall conditions,compared to complex and time-consuming numerical simulation calculations.
基金supported by National Magnetic Confinement Fusion Science Program of China(Nos.2010GB104001,2009GB106005)National Natural Science Foundation of China(Nos.51109112,11108177,11105180 and 11075180)partially supported by the Open Foundation of State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering of China(No.2011490804)
摘要Introducing strong radiative impurities as an important way to mitigate the peak heat load will be employed in EAST for high power long pulse experiments were explored under both low(L)and the first time in EAST,with the injection of argon into divertor plasmas has been considered at the divertor target plate for ITER,and operations.To this end,radiative divertor high(H)-mode confinement regimes,for and its mixture(25%Ar in D2).The Ar injection greatly reduced particle and heat fluxes to the divertor in L-mode discharges,achieving nearly complete detached divertor plasma regimes for both single null(SN)and double null(DN)configurations,without increasing the core impurity content.In particular,the peak heat flux was reduced by a factor of~6~significantly reducing the intrinsic in-out divertor asymmetry for DN,as seen by both the new infra-red camera and the Langmuir probes at the divertor target.Promising results have also been obtained in the H-modes with argon seeding,demonstrating a significant increase in the frequency and decrease in the amplitude of the edge localized modes(ELMs),thus reducing both particle and heat loads caused by the ELMs.This will be further explored in the next experimental campaign with increasing heating power for long pulse operations.