考虑位移影响及土拱效应的土压力研究

RESEARCH ON EARTH PRESSURE CONSIDERING DISPLACEMENT AND SOIL ARCHING

针对不同位移模式下的刚性挡土墙,提出考虑位移影响和土拱效应的土压力计算方法。将已有的内、外摩擦角与位移之间的关系式以及侧压力系数的表达式植入水平层分析法,推导出不同位移模式下的主、被动土压力的理论公式。并将计算结果与六个模型试验数据比较,结果表明:计算结果与试验数据的变化趋势基本一致,主动情况下吻合较好,被动稍差;从位移模式的角度来说,绕顶部转动(RT)模式吻合较好,绕底部转动(RB)模式被动情况与试验数据略有差距。总体而言,该方法基本上能够综合考虑挡土墙位移与土拱效应对土压力分布的影响。

A calculation method of earth pressure on the retaining wall of different movement models was proposed by taking the soil arching and wall＇s displacement into account.The relationship between the internal and external friction angle and coefficient of lateral earth pressure were incorporated into the horizontal layer analysis to derive the theoretic formulae of the active and passive earth pressures,the calculated results were compared with those of the test models.It is found that the calculation results are basically consistent with the ones of six models,with the active condition being better than the passive condition and the passive earth pressure of the movement model of rotation about bottom（RB） having the largest error.In general,the present method was taken into overall account the influences of wall movement and soil arching on the distribution of earth pressure.