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物部-冈部(Mononobe-Okabe)土压力理论广泛应用于地震作用下的土压力计算,但其关于土压力分布及合力作用点位置的假设与实际情况不符。从墙后滑动楔体中取出一顶面与填土表面相平行的局部楔体,通过建立楔体的力矩平衡方程,获得了侧向土压力系数的理论计算式,在此基础上推导出基于Mononobe-Okabe理论的非线性土压力分布及合力作用点位置公式,相关公式中考虑了挡墙发生偏转对土压力的影响。与试验实测数据的对比分析结果表明:土压力分布及合力作用点位置理论计算值与实测值基本吻合,改进的Mononobe-Okabe理论在有、无地震作用下均较好的反映了土压力的变化规律。
The Mononobe-Okabe theory of earth pressure is widely used to calculate earth pressure under earthquake action, but its assumptions about the distribution of earth pressure and the location of the resultant force point are not in accordance with the actual situation. A local wedge body whose top surface is parallel to the filling surface is removed from the sliding wedge body behind the wall, and the theoretical formula of lateral soil pressure coefficient is obtained by establishing the moment balance equation of the wedge body. Based on this, Mononobe-Okabe theory of non-linear earth pressure distribution and the location of the point of application of the formula, the formula to consider the deflection of the retaining wall on earth pressure. The results of comparison with the experimental data show that the calculated values of earth pressure distribution and the location of synergistic action point are in good agreement with the measured values. The modified Mononobe-Okabe theory can better reflect the change of earth pressure with and without earthquake law.