关于公路路基设计规范中挡土墙倾覆稳定方程表达式的商榷

《公路路基设计规范》 (JTG D30—2004)对挡土墙的设计首次提出了以荷载分项系数法为主的设计方法，即滑移和倾覆稳定采用分项系数法设计、地基承载力采用容许应力法设计。根据荷载分项系数法，相同的分项系数因荷载对挡土墙结构的不同作用效果必须取用不同的数值。但是，规范对倾覆稳定方程表达式表述含混，容易出错。根据分项系数的不同取值，对挡土墙倾覆稳定进行了大量计算，并与总安全系数法的计算结果进行比较，提出了倾覆稳定方程的修正表达式，供大家商榷。

Discuss on Expression of Retaining Wall＇s Overturning Stability in Specification for Design of Highway Subgrade

The design of retaining wall centering partial coefficient for the loads is firstly proposed in "Specifications for Design of Highway Subgrades"(JTG D30-2004),which designs slip and overturning stability by partial coefficient and bearing capacity of foundation by allowable stress.Thus the same partial coefficient will take different values because load acts on retaining wall structure differently,but the expression of overturning stability in the Specification is ambiguous resulting in errors easily.According to these different values of partial coefficient,through the massive calculation of overturning stability and then comparision to the result of total safety factor method,the revised of overturning stability equation is put forward for discussion.