边坡稳定性影响因素及应对措施

Influence factors of slope stability and countermeasures

以均质边坡为例,分别采用瑞典圆弧法、简化的毕肖普法、简布法等极限平衡法计算土坡的稳定性.研究了不同岩土力学参数对边坡稳定性的影响,并对不同土坡结构形式计算结果进行了对比分析,最后文章提出了边坡失稳的几种防治措施.结果表明:边坡稳定性随着土体重度的增大而减小,随着内摩擦角和粘聚力的增大而增大,随着坡体角度增加而减小;边坡总高度一定时,采用分级放坡可有效的提高坡体稳定性,且级数越多,坡体安全系数越大;当坡体总高度及各级边坡坡度相同时,平台宽度越宽,稳定系数越大,且平台宽度达到一定程度时,稳定系数保持不变;保持边坡总高度、平台宽度不变,当一级和二级边坡高差相差越大,稳定系数越小,当一级和二级边坡高度相等时稳定系数达到最大.

Taking homogeneous soil slope as an example, the paper uses limit equilibrium method,including Swedish circle method, simplified Bishop method and Janbu method to conduct slope stability calculation. The effects of different geome- chanieal parameters and different slope structures on slope stability are assessed and the calculation results were analyzed. Finally, the paper puts forward some measures to prevent slope failure. The results show that：slope stability decreases with the increases of soil density, increases with the increases of soil internal friction angle and cohesion, and decreases with the increase of slope angle. While the total height of the slope is fixed, the slope stability can be effectively improved by using hierarchical slope,factor of safety increases as the slope hierarch adds. While the total height of slope and slope angle is fixed, the factor of safety increases as the platform widens and eventually reaches a stable level. Fix the total height and platform width, the bigger of the height difference between adjacent slopes, the smaller of the factor of safety, and when the height is equal, slope stability coefficient reaches the maximum.