基于土体损伤的深基坑支护地表沉降量计算  

Calculation method of ground settlement of deep foundation pit support based on soil damage

作　　者：徐志彪[1] Xu Zhibiao(Yangling Vocational Technical College,Yangling 712100,China)

机构地区：[1]杨凌职业技术学院

出　　处：《电子测量技术》2019年第9期85-88,共4页Electronic Measurement Technology

基　　金：自然科学研究基金(A2018026)项目资助

摘　　要：目前深基坑外部地表沉降量计算均假定土体是理想的原状土,与工程实际不符,不能很好地表征深基坑外部地表沉降,针对此问题,提出了一种改进的深基坑支护地表沉降计算方法。首先,基于损伤土体力学理论,建立了土体损伤模型;然后,基于损伤条件下的土体演变和本构关系,构造了土体损伤条件下的基坑支护地表沉降计算模型。实验测试结果表明,该模型能够很好地描述深基坑工程中支护地表的沉降过程,与工程实践监测结果相符,且证明了土体损伤和地表超载均对基坑支护地表有较大影响。At present,the calculation of the external surface settlement of the deep foundation pit is based on the premise that the soil is an ideal undisturbed soil.This does not match the actual project.The external surface settlement of deep foundation pits cannot be well characterized.Aiming at this problem,an improved calculation method for ground settlement of deep foundation pit support is proposed.Firstly,based on the theory of damage soil mechanics,a soil damage model is established.Then,using the soil evolution and constitutive relation under the damage condition,the calculation model of ground settlement supported by the foundation pit is constructed.The experimental results show that the model can well describe the settlement process of the supporting ground surface in deep foundation pit engineering,which is consistent with the engineering practice monitoring results.The experimental results also prove that soil damage and surface overload have a great impact on the foundation pit support.

关 键 词：深基坑 支护结构 土体损伤 地表沉降 

分 类 号：TU445[建筑科学—岩土工程] TN98[建筑科学—土工工程]