关于水平层分析法的讨论

基于极限平衡法变分法得出的已有成果的基础上,分析了水平层分析法两个假定的合理性.研究表明,主动土压力强度沿墙高的分布对土条顶底面的法向力作用点位置系数非常敏感;法向力作用点位置系数为墙高的函数,除非在特殊情况下取常数1/2;土条间的切向作用力除非在特殊情况下为0,一般情形下为墙高的函数;水平层分析法使墙顶部的主动土压力强度变大,墙底部附近的主动土压力强度变小,提高了作用点的位置.

Discussion on horizontal slice method

Based on the existing results attained by the variational limit equilibrium method, two assumptions of the horizontal slice method are analyzed. Results show that the distribution of active earth pressure intensity along wall height is very sensitive to the action point position coefficient of the normal force acted on the top and the bottom of the soil slice; the action point position coefficient of the normal force is the function of the wall height and is 1/2 only in the special case; the horizontal slice method enlarges the earth pressure intensity at wall top and decreases the earth pressure intensity at wall bottom; thus the position of action point is moved up.