均质边坡分级开挖宽平台设计初探

Elementary Study on Design of Spacious Bnch in Homogengous Slope by Step Excavation

对整体稳定性较差的高边坡,在地形条件允许的情况下,建议在边坡中部设置宽平台。平台宽度达到一定值时,可使边坡平台上下级开挖互不影响,这样做的好处是当边坡产生局部失稳时就不会波及其他级边坡,从而避免从上到下连续大滑坡。提出采用极限平衡法搜索滑面的方法来确定宽平台的合理宽度,并用数值分析结果验证这种方法的合理性。进行了宽平台设计因子相关性分析,并建议采用工程类比的方法结合上述宽平台设计因子相关性找出一个较为合理的边坡开挖坡率和宽平台值。

With the condition landform permitting, Spacious bench in slope is suggested to set in the middle of slope that whole stability is of a sort in this paper. When the width of spacious bench is reach a fixed value, excavation in slope above and under the bench cannot affect each other. With this advantage, when a local failure in slope occurs the other parts will not be affected. A method to get the width of Spacious bench using limit equilibrium searching is put forward in this paper. Numerical analysis is used to validate rationality of the method. Relativities of Spacious bench design genes is studied, Engineering analogy method combined with the relativities are used to get a reasonable value of the ratio of slope and the width of bench.