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关于考虑土拱效应的临近地下室外墙影响下的挡土墙主动土压力的研究目前已经取得了很多成果,但对考虑地表附加应力影响时的研究还有较多的不足。研究发现,考虑地表附加应力时挡土墙后破裂土体的平均竖向应力σv的求解公式与地表到墙后土体破裂面的最短距离H1和张拉裂缝的深度zc的正负以及两者之间的关系有关,以此为基础将该问题分为4种情况进行研究,推导出了各情况下相应的σv的求解公式,并得得到了其相应的主动土压力计算公式;同时,通过对主动土压力积分推导出了各情况下相应的主动土压力合力和倾覆力矩的计算公式,由此可以计算合力作用点的高度。算例表明,地表附加应力的存在会对主动土压力的分布以及合力作用点的位置有较大的影响,证明了本文研究的必要性。
There are many achievements on the research of active earth pressure on the retaining wall under the influence of the soil base arch near the basement wall considering the soil arching effect. However, there are still many deficiencies in the study of the influence of the additional stress on the earth surface. It is found that the formula for calculating the average vertical stress σv of post-cracked earth retaining wall considering the additional surface stress and the positive and negative of the shortest distance H1 from the surface to the earth’s rupture plane and the depth zc of the tensile fracture, On the basis of which the problem is divided into four kinds of situations to study and deduce the corresponding formula of σv in each case and obtain the corresponding formula of active earth pressure; at the same time, The active earth pressure integral is deduced to calculate the corresponding active earth pressure resultant force and overturning moment in each case, which can calculate the height of the resultant force point. The example shows that the existence of additional surface stress will have a great influence on the distribution of active earth pressure and the position of the point of resultant force, proving the necessity of this study.