对《建筑边坡工程技术规范》的讨论——以岩体等效内摩擦角法计算侧向岩石压力

Discussion on the ‘Technical Code for Building Slope Engineering'——Calculation of the Lateral Rock Pressure by Method of Equivalent Internal Friction Angle

基于采用岩体等效内摩擦角法计算岩石侧压力的结果偏大,通过分析计算方法存在的问题及其计算结果偏大的原因后,提出无外倾结构面时岩石侧压力应由采用岩体等效内摩擦角按侧向土压力方法计算值减去岩体破裂角与等效内摩擦角间岩石侧压力沿规范计算值方向分力获得,分析了本文计算方法的合理性及经济性。研究结果表明,直立切坡采用文中的计算方法可以减小岩石侧压力约1.6%～16.6%;岩体破裂角及其与等效内摩擦角间差值越大,减小工程造价越多,减小工程造价的程度越明显。新的计算方法具有安全性和一定的经济性。

It is too large for the result of lateral rock pressure calculated by method of equivalent internal friction angle. After analyzing the problem in calculation method and the reason of too large result,this paper puts forward that the lateral rock pressure should be the result of calculation by method of equivalent internal friction angle minus the component force along the calculated value direction by code of the lateral rock pressure of rock between break angle and equivalent internal friction angle when there was no extraversion structural surface. And the rationality and economy of the new calculation method were validated by theoretical analysis. The results show that the lateral rock pressure can be reduced about by 1. 6% ～ 16. 6% with the new calculation method in vertical slope. And the rock pressure or the difference between rock pressure and equivalent internal friction angle were larger,the decreases of project cost and the extent of project cost decreasing were more. This new method is safe with certain economic benefits.