岩土力学2017，Vol.38Issue(2)：385-391,399,8.DOI:10.16285/j.rsm.2017.02.011
蠕动型滑坡滑带土蠕变特性研究
Creep properties of sliding-zone soil from a creeping landslide
摘要
Abstract
A creeping landslide shows a deformation response of long-term and small-scale,the evolution and stability of which are controlled by the creep response of sliding-zone soil.The Majiagou landslide,a typical creeping landslide in Three Gorges reservoir region,is selected as a case.A series of large-scale triaxial compression tests is conducted on the undisturbed specimens of sliding-zone soil to reveal the creep laws of sliding-zone soil under different confining pressures and stress levels.On this basis,the difference between long-term strength and conventional strength of the soil is determined by the isochronous curves.The results show that the sliding-zone soil of Majiagou landslide has steady creep characteristic,and the creep process can be divided into attenuation creep stage and constant speed creep stage.And the deformation tendency of sliding-zone soil is similar to the macroscopic deformation of the landslide.The absolute creep displacement and the strain rate of constant speed creep stage are positively correlated with the axial stress.While the duration of the attenuation creep stage increases linearly with the shear stress level.The long-term cohesion and the long-term internal frictional angle decrease by 24.8％ and 22.4％ respectively comparing with the conventional strength parameters.关键词
蠕动滑坡/滑带土/三轴蠕变试验/蠕变特性/长期强度Key words
creeping landslide/sliding-zone soil/triaxial creep tests/creep properties/long-term strength分类
建筑与水利引用本文复制引用
孙淼军,唐辉明,王潇弘,胡新丽,汪明元,倪卫达..蠕动型滑坡滑带土蠕变特性研究[J].岩土力学,2017,38(2):385-391,399,8.基金项目
国家重点基础研究发展项目(973计划)(No.2011CB710604) （973计划）
国家自然科学基金项目(No.41272305).This work was supported by the National Program on Key Basic Research Project of China (973 Program) (2011CB710604) and the National Natural Science Foundation of China (41272305). （No.41272305）
