围护结构变形模式对土压力的影响

Effect of deformation modes of retaining structures on earth pressures

围护结构的变形模式、土体的性质、墙土间的摩擦特性以及墙后填土随位移增大产生的变形和强度的发展等因素都对围护结构所受的土压力的大小和分布产生影响,而经典的土压力理论无法考虑以上除土体性质之外的诸多因素的影响。本文利用三维数值分析方法,在考察计算范围和边界条件对计算结果产生的影响的基础上,把围护结构变形模式加以简化,探讨了不同的围护结构变形模式对土压力大小和分布的影响,经分析发现围护结构变形模式不同,土压力达到极限状态所需位移不同,而且所受土拱效应的影响程度也显著不同。同时本文分析了围护结构单一变形模式下,土体参数对土压力的影响。

Earth pressures are the result of interaction between soils and retaining structures. There are many factors that have an influence on magnitude and distribution of earth pressures, such as deformation modes of retaining structures, soil properties, frictional character between retaining structures and soils, deformation and intensity development caused by soil displacement increasing gradually and so on. However, classical earth pressure theories can＇t consider these factors except soil properties. Based on the analysis of the effect of calculation dimensions and boundary conditions on the results, the deformation modes of retaining structures were simplified and the effect of different deformation modes of retaining structures on magnitude and distribution modes was studied. The results indicate that earth pressures need ＇different soil displacements to come to limit conditions for different retaining, structures and they are affected by soil-arch effect to different extents. At the same time, the effect on earth pressures of soii parameters for one retaining structure was also discussed.