黏性土挡土墙土拱效应的研究

为了研究黏性土挡土墙中滑裂面倾角变化对土拱效应的影响,在假定土拱形状为圆弧的基础上推导了考虑滑裂面倾角变化时侧向土压力系数的计算公式,推导出考虑土拱效应的张拉裂缝公式;并基于土楔形力学模型,得到了滑裂面倾角公式,以及考虑滑裂面倾角变化的竖向平均应力计算公式. 本文提出的计算方法不仅考虑了土拱效应,同时也考虑了考虑滑裂面倾角变化对挡土墙土压力的影响,因而更符合实际情况.

Research on Arching Effect of Cohesive Soil Behind Retaining Wall

In order to study the arching effect of cohesive soil on the calculation of the active earth pressure behind the retaining wall, a new lateral pressure coefficient formula related to the angle of slip surface and the tension crack was first derived and further studied. Then based on the analysis of the soil wedge model, the formula used to calculate the angle of slip surface was deduced with consideration of the soil-wall friction angle and cohesion. At last, based on the analysis of the microelement model and using the static mechanic method, the new vertical mean stress distribution formula was derived. The calculated results of sand and clay soils were in an agreement with the test data. Therefore, it was necessary considering the arching effect of slip surface angle in the calculation of the active earth pressure.