顺层岩质岸坡板桩支护结构土压力计算*

采用有限元软件PLAXIS对顺层岩质岸坡上板桩墙的墙后土压力进行分析计算,探讨了不同结构面倾角时板桩墙自身的位移以及墙后土压力的变化趋势,得到了板桩墙墙后土压力的大小和土压力分布形式。结果表明:顺层岩质岸坡上板桩墙的墙后土压力合力值随着结构面倾角的增加呈先减小再增大的趋势,同时墙后土压力的大小不是随入土深度的增加而简单地呈线性增大,而是出现不规则的增大或减小,墙后土压力最大值基本都出现在墙体临空界面处或者墙体的底部,在进行板桩墙稳定性分析中应全面考虑墙底部及板桩墙临空界面处最大土压力。研究成果可为完善《建筑边坡工程技术规范》提供参考。

Soil pressure calculation of sheet-pile walls on rock- bedded slope

This paper analyzes calculates the soil pressure of the sheet-pile wall on the rock-bedded slope with PLAXIS, discusses the variation trend of the soil pressure and horizontal displacement with different inclination angles, and obtains the value and distribution of the sheet-pile wall on the rock-bedded slope. The research results show that the total lateral soil pressure of the sheet-pile wall first increases and then decreases with the increment of the inclination angles, the soil pressure does not present the simple linear increase distribution, but an irregular distribution, the maximum soil pressure presented on the freeing surface or the bottom of the sheet-pile wall. The results may serve as a reference for the perfection of the Technical Code for Building Slope Engineering.