原创《软土基坑引起下卧隧道隆起非线性流变》：本论文主要论述了流变论文范文相关的参考文献,对您的论文写作有参考作用。
作者简介：张俊峰（1973）,男,博士生,主要从事城市建设土木工程、结构工程、岩土工程方面的研究,（Email）zjf10@163.com.
王建华（通信作者）,博士生导师,教授,(Email)wjh417@sjtu.edu.cn.摘 要：软土地区深基坑开挖改变了周边土体的初始应力,引起周边土体的位移,对周边构筑物造成不均匀沉降、混凝土开裂等不利的影响,并且可能危及临近地铁隧道的安全.对基坑开挖引起的下卧隧道的隆起变形进行了研究并提出了实用的预测方法.基坑开挖土体卸载引起的土体变形采用了Boussinesq应力解进行求解,隧道反力引起的土体变形采用了弹性半空间Mindlin应力解进行分析.隧道本身变形采用了弹性的地下连续梁进行分析,并且考虑隧道和土体的相互作用.通过引入软土的非线性流变模型,考虑了软土变形的时间效应,因此可以对复杂开挖过程进行模拟分析.还对基坑开挖对隧道隆起的效应进行了讨论,通过上海市某重点工程实例的隧道隆起量的预测结果和实测值对 析,隧道隆起的监测结果证实了该方法的有效性.
关键词：隧道隆起；基坑开挖；土和隧道结构共同作用；非线性流变；明德林解；布辛奈斯克解
中图分类号：TU311.41文献标志码：A文章编号：16744764（2012）03001006
Nonlinear Rheological Analysis on Tunnel Displacement Induced
by Adjacent Excavation in Soft Clay
ZHANG Junfeng1, WANG Jianhua1, WEN Suolin2
(1.Civil Engineering Department, Shanghai Jiaotong University, Shanghai 200240, P. R. China;
2. Shanghai Tunnel Engineering Co., Ltd., Shanghai 200082, P. R. China)
Abstract:Deep excavation in soft clay often brings soil stress disturbance and soil deformation, which would bring differential settlement and structural cracks. It probably brings safety problems to adjacent underground tunnels. Therefore, it is necessary to predict tunnel displacement induced by excavation for tunnel’s security. A new method was proposed to estimate the heave of underlying tunnel induced by adjacent excavation verified by field measurements. The soil deformation by excavated soil gravity was analyzed by application of Boussinesq solution. The soil deformation by tunnel surface pressure was analyzed by Mindlin solution. The tunnel was assumed to be an elastic beam on foundation to simulate the tunnel, in which interaction analysis of tunnel and soil was employed. In consideration of rheologic soil, Viscoelastic model was employed to analyze soil nonlinear displacement with time in soft clay. Tunnel displacements were discussed by different excavation cases. A case study showed a good agreement between the results from the prediction and the measurement.
Key words:tunnel displacement; excavation; tunnelsoil structure interaction; nonlinear rheological; Mindlin solution; Boussinesq solution
近年来在城市建设、市政交通施工中经常会碰到这种地铁隧道上方进行基坑开挖的情况.这种土体开挖引起了基坑周边土体应力场的改变,进而可能引起临近构筑物的不均匀沉降和混凝土开裂等不利影响.同样,地铁隧道的不均匀沉降可造成隧道的直接破坏［1］.因此对于这种越来越多的隧道上方基坑开挖情况,必须在开挖之前对开挖造成的隧道隆起问题事先进行预测和地铁运行安全性评估.
目前进行基坑开挖引起的隧道隆起量预测主要有3类方法：大型有限元数值模拟分析［23］、残余应力法［4］以及基于Mindlin理论解推导隧道应力的弹性地基梁方法［5］.大型有限元方法对于基坑整体分析问题比较全面,由于建立了三维模型,分析结果非常详细和直观.但是实际工程中对于初步方案设计、详细施工方案论证等诸多阶段,由于设计目的不同,不可能每个阶段都建立大型有限元模型进行长时分析.残余应力法按分层总和法的思路,根据开挖引起的残余应力场计算了隧道处土体的隆起变形,该方法简便易于理解和使用,但该方法没有考虑隧道抵抗土体隆起的作用.基于Mindlin理论解推导隧道应力的弹性地基梁方法计算了隧道处的应力分布进而按弹性地基梁的方法计算隧道变形,这种方法较好地考虑了隧道的刚度作用,但是没有考虑隧道和周边土体力的相互作用.
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