散粒体斜坡稳定性相关因素试验研究

Experimental Research on Related Factors for Stability of Granular Mixture Slope

松散颗粒堆积斜坡的稳定性一直是边坡研究的一个难题且少有涉足,此种灾害形式在我国西部山区较为常见。以散粒体斜坡的稳定性受控于何种因素作为研究出发点,以休止角为衡量标准,对散粒体斜坡失稳进行试验研究。试验结果表明:颗粒类圆程度越高其堆积休止角越小;休止角随颗粒的增大有增大的趋势;粗颗粒的含量增大稳定性呈现先增后减的现象;颗粒级配的改良对坡体稳定性起到促进作用。对滑动面的角度研究显示:滑面角度为最大休止角减去2.5°左右,并做了适当的修正处理。成果对散粒体斜坡稳定性的研究以及此类溜砂灾害的治理有一定的参考意义。

The stability of loose granular pile slope has been a difficult problem and less involved in slope research ,and this kind of disaster is common in the western mountains of China .Here ,taking what factors are the control ones for the granular mixture slope as the starting point in the research and taking the repose angle as the measuring standard ,the in-stability of the granular slope is tested and studied .The test results show that the repose angle is smaller when the particle grinding degree is higher ;the repose angle has a increasing trend along with the increase of particle ;as the content of coarse particle is increased ,the stability is increased first and then decreased ;the modified grain composition has pro-moting effect on the stability of slope .The study of the sliding surface angle shows that the sliding surface angle is about the maximum repose angle minus 2 .5＆#176; ,and the appropriate correction is made .This results has a certain reference sig-nificance on the granular slope stability studies and the disaster management as such sliding sand .