尺寸效应及成岩差异对边坡稳定性的影响规律

Rules of influence of size effect and diagenesis difference on slope stability

为研究三维边坡尺寸效应及在不同成岩区域岩性差异对边坡稳定性的影响规律,采用FLAC3D软件建立模型进行计算分析,研究了边坡走向长度L与高度H之比(L/H)与三维边坡稳定性的关系,以及不同成岩条件下边坡稳定系数的降幅差异。结果表明:随着L/H的不断增长,边坡稳定系数呈负指数规律递减,当L/H<4时,稳定系数下降的幅度较大,并逐渐放缓;当L/H≥4时,稳定系数开始趋于稳定;当L/H≥7时,稳定系数已与L无关。不同区域的边坡稳定性受L/H的影响呈现一致的下降规律,且边坡稳定系数降幅与成岩强度呈负相关。

In order to study the law of 3D slope stability on thesize effect and diagenesis difference, models were built and ana- lyzed by FLAC3D. The influence of slope direction length and height ratio （ L/H ） and the decline level of slope stability coeffi- cient in different diagenetic conditions were studied in this paper. The results indicate that with the increase of L/H , the stability coefficient decreases following the law of negative exponent. When L/H is lower than 4, the stability coefficient changed greatly. When L/H is larger than 4, the stability coefficient ten- ded to be stable. When L/H is larger than 7, the stability coeffi- cient is no correlation with L. The slope stability is in line with the same regularity with the change of L/H in different area, and the decreased degree has a negative correlation with different dia- genetic strength.