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在分析现场实测资料的基础上,假定侧壁土压力极大值出现的临界深度,基于土拱效应原理,采用水平层分析方法,得到井壁处侧壁土压力系数及侧壁土压力计算式。根据沉井竖向平衡方程,反算出临界深度并分析了其影响因素。结果表明,随着沉井重量增加、土体内摩擦角增大,临界深度增大,即侧壁土压力极值点位置越偏下;随着井壁与土体外摩擦角增大、沉井高度增加,临界深度减小,即侧壁土压力极值点位置越偏上。该研究结果可有效指导沉井设计与施工。
Based on the field data, the critical depth of the maximum soil wall pressure is assumed. Based on the principle of soil arching, a horizontal layer analysis method is used to calculate the formula of the earth pressure coefficient and the earth pressure on the side wall. According to the vertical balance equation of caisson, the critical depth is calculated and the influencing factors are analyzed. The results show that as the weight of caisson increases, the internal friction angle increases and the critical depth increases, that is, the lower the extreme value of the earth pressure on the sidewall, the more the caisson height increases with the increase of the external friction angle between the wall and soil , The critical depth decreases, that is, the more the location of the extreme point of soil pressure on the sidewall is. The results of this study can effectively guide caisson design and construction.