加筋土边坡安全评价的简化水平条分法  

Simplified horizontal slice method of reinforced soil slopes safety analysis

作　　者：乐超[1,2] 徐超[1,2] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《水文地质工程地质》2013年第2期74-78,共5页Hydrogeology & Engineering Geology

摘　　要：对于加筋土填方边坡圆弧滑动安全系数的计算,传统垂直条分法难以合理考虑水平向加筋力和地震力,造成计算结果偏保守;而基于Morgenstern-Price假设的水平条分法在验算加筋土边坡稳定性时,虽严格满足极限平衡条件,但需进行双重迭代,使计算过程过于复杂,不适合工程应用。本文参考Janbu假设来定义条间切向力Xi,简化了法向条间力Ei的计算,重新推导出只需单个迭代的加筋土边坡水平条分法安全系数计算公式,使计算过程更简洁。采用Bishop垂直条分法和简化水平条分法分别计算了某工程的两个实例,并进行了比较和分析,证明本文提出的方法合理易行。In the analysis of the factor of safety of reinforced soil fill slopes,the horizontal tension forces of reinforcing elements and seismic forces cannot be considered properly for common vertical slice methods and the result is a little conservative.The proposed horizontal slice method,which is based on the Morgenstern-Price Method,complies strictly with the limit equilibrium condition,but both of the factor of safety and the scaling factor must be computed iteratively,which makes the method too complex to be popularized in the engineering design.In this paper,the expression of the factor of safety of the simplified horizontal slice method is based on the assumption of inter-slice tangential force Xi made by Janbu,and the simplified calculation of inter-slice normal force Ei,which should be computed iteratively just for the factor of safety,makes the computational process simpler and clearer.Two cases of reinforced soil slopes are analyzed by using the Bishop vertical slice method.The simplified horizontal slice method is proposed in this paper and the computation results are compared.The result shows that the proposed method is rational and simple to use.

关 键 词：加筋土边坡 极限平衡 简化水平条分法 地震荷载 

分 类 号：TU43[建筑科学—岩土工程]