关键词: 粉质黏土, 强度参数, 相关性, 滑带土, 重庆库区

Abstract: Landslide is a kind of main geological disasters in Three Gorges Reservoir area. To landslide, the slide surface soil is an important component which relates closely to the deformation development and stability evaluation, so it is a key problem to study the shear strength parameters of these soils in stability evaluating and slide resistant designing. Most of the slide surface soil of the landslides along Three Gorges Reservoir in Chongqing is silty clay. The geological survey reports of representative landslides in Chongqing are collected. Taking strength parameters the slide soil as the research object, studies are mainly concentrated on the samples got from the site of the landslide and survey reports. The correlation among the natural peak strength, residual strength, saturated peak strength, residual strength by the conventional direct shear test in laboratory, and the correlation between the strength parameters from conventional direct shear test in laboratory and in situ are deduced. Then the regression equations among these strength parameters are established, and the characteristics of strength parameters under different test conditions are revealed finally.

Key words: silty clay , strength parameters , correlation , slide surface soil , Chongqing Reservoir Area ;