考虑平动位移效应的刚性挡土墙土压力理论

Theory of earth pressure against rigid retaining walls considering translational movement effect

针对平动模式下的刚性挡土墙,研究了考虑平动位移效应的非极限状态土压力计算理论.考虑墙体平动位移对墙后填土内摩擦角及墙土接触面上外摩擦角的影响,建立了内外摩擦角与位移之间的关系公式.对平动未达到极限位移的挡土墙,结合位移与摩擦角之间的关系,分析了最不利情况下墙后土楔的受力情况,得到考虑位移效应的非极限状态土压力计算公式.通过比较,发现理论公式计算结果与模型试验结果较吻合.

Considering the movement effect of translational wall, a new method for calculating the earth pressure against rigid retaining walls was proposed. Based on the translation effect on the internal friction angle of the backfill and the outer friction angle on the soil-wall interface, the relationship between the friction angles and the wall movement was obtained. By analyzing the forces on the most unfavorable soil wedge, the formula for calculating earth pressure in the non-limit state was established. Comparison of the calculated results with the measured results from model tests show that the proposed method can provide a good prediction of the earth pressure behind rigid retaining wall under translation mode.