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以麻柳湾-昭通高速公路为工程背景,研究了岩堆斜坡路基的极限填方高度。针对不同的黏聚力c、内摩擦角φ和坡角α设计了96组方案,利用临界滑动场方法计算了岩堆斜坡上的路基极限填方高度,根据计算结果绘制了便于工程实用的路基极限填方高度H的速查曲线。根据该曲线可以开展如下工作:1)迅速获得已知岩堆斜坡的极限填方高度H,初步判断路基的整体稳定性;2)获得设计填方高度H’下路基填料的若干组最小强度指标,为填料的选择提供指导。研究结果应用于麻柳湾-昭通高速公路项目中,取得了良好的效果,也可为类似工程的初步设计提供简单实用的参考依据。
Taking Maliuwan-Zhaotong Expressway as the engineering background, the height of the limit fill of rocky dump slope subgrade is studied. According to different cohesion c, internal friction angle φ and slope angle α, 96 schemes were designed. The critical height of embankment on rock mass slope was calculated by using the critical slip field method. Based on the calculation results, the engineering subgrade Limit fill height H of the quick check curve. According to this curve, the following work can be done: 1) Obtain the ultimate height H of the known rock mass slope quickly and determine the overall stability of the subgrade; 2) Obtain some minimum intensity index of the subgrade filled with design fill height H ’ , For the choice of filler to provide guidance. The results have been applied to the Maliuwan - Zhaotong Expressway project and achieved good results. It can also provide a simple and practical reference for the preliminary design of similar projects.