摘要
Narrow backfill earth pressure estimation is applied to study the stability of supporting structures in the vicinity of existing buildings.Previous narrow backfill earth pressure studies have neglected seismic-unsaturated seepage multi-field coupling,resulting in inaccurate estimates.To address these deficiencies,this paper proposed a calculation method for seismic passive earth pressure in unsaturated narrow backfill,based on inclined thin-layer units.It considers the interlayer shear stress,arching effect,and the multi-field coupling of seismic-unsaturated seepage.Additionally,this paper includes a parametric sensitivity analysis.The outcomes indicate that the earthquake passive ground pressure of unsaturated narrow backfill can be reduced by increasing the aspect ratio,seismic acceleration coefficient,and unsaturation parameterα.It can also be reduced by decreasing the effective interior friction angle,soil cohesion,wallearth friction angle,and vertical discharge.Furthermore,for any width soil,lowering the elevation of the action point of passive thrust can be attained by raising the effective interior friction angle,wall-earth friction angle,and unsaturation parameterα.Reducing soil cohesion,seismic acceleration coefficient,and vertical discharge can also lower the height of the application point of passive thrust.
窄填土压力适用于计算临近建筑物的支护结构的稳定性。以往的窄填土压力研究忽略了地震-非饱和渗流多场耦合作用,导致计算不准确。为了解决这些不足,本文提出了一种基于倾斜薄层单元的非饱和窄填土地震被动土压力计算方法,考虑了层间剪应力、拱效应和地震-非饱和渗流的多场耦合。此外,本文开展了参数敏感性分析。结果表明,增加宽高比、地震加速度系数和非饱和参数α,可以降低非饱和窄填土的地震被动土压力。此外,对于任意宽度土体,增大有效内摩擦角、墙土摩擦角和非饱和参数α,可以降低被动土压力合力作用点高度。此外,降低土体黏聚力、地震加速度系数和垂直渗透量也能降低土压力合力作用点高度。
基金
Project(42277175)supported by the National Natural Science Foundation of China
Project(NRMSSHR-2022-Z08)supported by the Key Laboratory of Natural Resources Monitoring and Supervision in Southern Hilly Region,Ministry of Natural Resources,China。
作者简介
Corresponding author:LIN Hang,PhD,Professor,E-mail:linhangabc@126.com,ORCID:https://orcid.org/0000-0002-5924-5163。
