青海某地区非饱和滑坡滑带土蠕变特性研究

Study on creep characteristics of unsaturated landslide sliding zone soil in one area of Qinghai

对滑坡滑带土的分析研究是判断滑坡稳定性的重要基础,滑坡在其生命周期演化过程及稳定性主要受滑带土蠕变特性控制。为解决滑坡漫长生命周期内的滑带土长期强度问题,以青海省西宁市某土质滑坡为例,利用滑坡滑带土的三轴蠕变试验,研究滑带土在不同压力水平下的蠕变特性,并进一步求得滑坡滑带土的长期抗剪强度。研究表明:滑带土的长期强度与常规强度相比,其黏聚力和内摩擦角分别下降了23.25%和28.27%。蠕变研究成果能为滑坡生命周期内的稳定性和滑坡土体蠕变特性提供技术研究资料。

The mechanical parameters of sliding-zone soil are one of the most important determinative factors to judge the stability of landslide,and the evolution process and stability of its life cycle are mainly controlled by the creep characteristics of sliding-zone soil.In order to solve the problem of long-term strength of sliding-zone soil in the long life cycle of landslide,the creep characteristics of sliding-zone soil under different pressure levels are studied by using triaxial creep experiment of sliding-zone soil,and the long-term shear strength of sliding-zone soil is further obtained.The study result shows that the cohesion and internal friction angle of the sliding zone soil decrease by 23.25%and 28.27%respectively for the comparison of the long-term strength with the conventional strength.The creep research results can provide technical data for the stability of landslide and the creep characteristics of landslide soil in its life cycle.