红层滑坡滑带土结构强度试验研究

川东红层是滑坡等地质灾害的多发区,研究滑带土结构强度特征对滑坡稳定性评价及滑坡治理工程设计有着重要意义。通过对不同含水率、不同压力、不同时间固结试样的强度试验,分析了结构强度随含水率、压力、时间的变化规律。研究认为:1水对结构强度的影响具有双面性,结构强度随含水率变化曲线呈"山峰"状;2含水率较小时,试样的结构强度随密度增大而增大;3滑带土中含有较多的黏土矿物,黏土矿物的软化、膨胀、定向排列降低了试样的结构强度。

EXPERIMENTAL STUDY OF STRUCTURAL STRENGTH FOR SLIDE ZONE SOIL OF RED BEDS

The red bed which located in the geological disasters frequently occur area in the East of Sichuan, thus studying the structural strength characteristics of slide zone soils in this area could help us to evaluating the stability of landslides and also improving the slope control engineering in landslides. Based on the strength tests on different moisture content, pressure and consolidation time, the relationships between soil structural strength with moisture content, pressure and consolidation time has been analyzed. Research results as follows: (1) Water has two-side influence to the soil structural strength, the relationship between structural strength and moisture content are shown as a waved mountain. (2) The soil structural strength is increasing with the density of the soil, when the moisture content is small. (3) When the slide zone soil contains a large number of clay minerals, the soften, expand and directional arrangement characteristics of the clay minerals can also decrease the soil structural strength.