基坑围护结构侧向变形引起的坑外土体变形研究

基坑围护结构侧向变形引起的土体侧移和沉降,会对坑外桩基的水平和竖向承载性状造成影响。基于影像源法,在综合考虑围护结构变形、地表沉降以及围护结构变形方向对坑外土体位移影响的基础上,对基坑围护结构侧向变形引起的坑外土体侧移和沉降计算方法展开了研究。首先,采用分段法,分别研究了围护结构变形和地表沉降作用下坑外土体侧移及深层沉降;然后,基于叠加原理,针对坑外任意点位置土体侧移和沉降,推导出了适用于不同基坑围护结构变形模式的相关计算公式;最后,将采用本文方法得到的坑外土体侧移及沉降计算结果同实测结果及现有理论方法的计算结果进行对比分析。结果表明,采用本文方法得到的坑外土体侧移及深层沉降与现场实测结果吻合度更高,从而验证了本文方法的可行性。

Analysis on Soil Movements for Lateral Deformation of Retaining Wall

The lateral displacement and settlement of soil around pile due to lateral deformation of retaining wall have affected the bearing behavior of the pile.Therefore,it is very necessary to study displacement field of soil for lateral deformation of retaining wall.In this paper,an analysis was used to study lateral movement and deep settlement of soil behind retaining wall involving retaining wall deformation,ground surface settlement and direction of retaining wall deformation.Firstly,by the division method,the lateral movement and deep settlement of soil behind retaining wall for retaining structure deformation and ground surface settlement were studied respectively.Secondly,a theory method to calculate the lateral movement and deep settlement of soil behind retaining wall was proposed according to principle of superposition.Finally,an analysis was done by comparing results of soil movements behind retaining wall by the method of this paper,the existing theory methods and measured in situ.It is found that the soil movements by method of this paper are fit the result measured in-situ better than results by the existing theory methods.Therefore,the method proposed in this paper is feasible to calculate the soil movements behind retaining wall induced by lateral deformation of retaining wall.