衡重式桩板挡墙上墙土压力模型试验研究

简要介绍了几何相似系数为7的衡重式桩板挡墙模型和多工况模型试验，着重分析了上墙在不同卸荷板尺寸和设置位置及有外荷载工况下对上墙土压力的分布问题。试验结果表明：①板埋深超过某一深度时，并不能有效改善上墙主动土压力的分布情况，反过来说明存在最佳埋深位置。②板宽对卸荷板上表面处的土压力影响较大，但对上墙土压力总体分布趋势没有影响。③填土荷载下，当卸荷板宽度和上墙高比值小于0.4时，上墙土压力接近于朗肯土压力分布；当宽高比大于1.3时，上墙土压力分布更接近于静止土压力。④工程设计时，上墙土压上墙土压力可按公式 计算

Model tests on earth pressure of upper part wall of sheet pile wall with relieving platform

The model tests of sheet pile wall with relieving platform by use of geometric similarity coefficient of 7 and its different conditions are introduced briefly. The earth pressure distributions on upper wall with changing of the width and depth of relieving platform under the conditions of embankment and an external load are analyzed emphatically. The results show that: ①The depth of relieving platform exceeds a certain depth, which can't improve effectively the distribution of active earth pressure on the upper wall; in turn that exists best depth location. ②The change of width of relieving platform has a great influence on earth pressure near the surface of relieving platform, but has no effect on the overall distribution trend of earth pressure on upper wall. ③In the embankment load , when the ratio of the relieving platform width to the height of upper part wall is less than 0.4，the distribution of earth pressure on the upper wall is close to the Rankine's earth pressure; when the ratio is more than 1.3, the distribution of earth pressure on the upper wall is close to the at rest earth pressure. ④In engineering design, it is suggest that the upper part wall earth pressure can be calculated by the formula