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目前,对于填土为粘性土且填土面或墙背面轮廓复杂的挡土墙,设计规范中还没有特定的公式求解墙后土压力。文章采用《土力学》书中介绍的图解法和《水工挡土墙设计规范》土压力计算章节中的公式联合求解,分别计算填土为粘性土且填土面为水平面与斜坡面组合时的挡土墙墙背上的主动土压力。通过计算分析得:公式联合求解与图解法相比求得的挡土墙稳定安全系数仅相差了1.5%,所以在实际工程中两种方法均可采用,图解法较公式法更加简便,公式法较图解法计算结果更加保守。但是当墙后填土由性质不同的土层组成时,图解法受到限制,需采用公式联合求解。
At present, there is no specific formula in the design code for solving the earth pressure behind the wall for the retaining walls with the clay as the filling soil and the filling surface or the back of the wall. The article uses the graphic method introduced in the book “Soil Mechanics” and the formulas in the section of earth pressure calculation of “Code for Design of Hydraulic Retaining Wall” to calculate the formulas respectively. When the fill is clay and the fill surface is horizontal and ramp Active earth pressure on the back of the retaining wall. Through calculation and analysis, the safety coefficient of the retaining wall calculated by the formula is less than 1.5%, so both methods can be used in practical engineering. Graphical calculation results more conservative. However, when the backfill is composed of different types of soil layers, the graphic method is limited and the formula should be used jointly to solve the problem.