【摘要】 "5·12"汶川地震诱发了大面积的山体滑坡,直接威胁人类的生命财产安全。陇南三家地老滑坡在这次地震期间前缘大规模滑动,并在前缘滑动牵引下诱发后缘形成贯通裂缝,严重威胁滑坡体上三家地村1 732村民的生命财产安全。因此,准确判断该滑坡稳定性,并采取相应的防治措施尤为重要。在对三家地滑坡进行现场勘查、室内试验和相关论证的基础上,阐述该滑坡的基本特征和成因,并运用传递系数法和数值模拟对该滑坡在不同工况下的稳定性及应力应变进行了计算、模拟和评价。研究结果表明,天然状态下,三家地老滑坡的整体稳定性系数为1.30～1.36,处于稳定状态;在地震和暴雨工况下,老滑坡的整体稳定性系数为1.02～1.09,处于欠稳定状态。最后,基于滑坡成因和稳定性评价结果,提出为提高滑坡稳定性应采取的加固措施。更多还原

【Abstract】 The "5·12" Wenchuan earthquake induced a large number of landslides,which had directly threatened the safety of human lives and properties.The old Sanjiadi landslide in Southern Gansu Province experienced large-scale collapse in foreside and a long,and through cracks formed owing to the front traction during Wenchuan earthquake,which could seriously jeopardize the safety of 1 732 people of the village on it.It is therefore very important to understand adequately and maintain effectively the stability of the landslide.Based on field investigation,indoor test and related studies on Sanjiadi landslide,the basic characteristics and formation mechanism were elaborated.Assuming different working conditions,the stability and stress-strain features were calculated and analyzed by adopting transfer coefficient analysis and numerical simulation.The results show that the integral stability coefficients of the old landslides ranged 1.30～1.36,implying a steady state in the normal condition.Under rainstorm and seismic conditions,the stability coefficients of landslide were 1.02～1.09,indicating an unstable state.Finally,relevant engineering strengthening measures were provided based on the formation mechanism and quantitative evaluation results of the landslides.更多还原