膨胀岩土地层环状膨胀对盾构隧道衬砌荷载的影响  

Influence of Annular Expansion on Load of Shield Tunnel Lining in Expansive Layer

作　　者：方勇[1] 符亚鹏[1] 崔戈[1] 杨斌[1] 

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031

出　　处：《地下空间与工程学报》2014年第4期829-833,841,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51278422);高铁联合基金(No.U1134208);国家科技支撑计划课题(2012BAG05B03);国家973计划课题(2010CB732105);四川省青年科技基金(2012JQ0021);中央高校基本科研业务费专项资金(No.SWJTU11ZT33)

摘　　要：为了获得膨胀岩土地层环状膨胀产生的膨胀荷载对于盾构隧道衬砌结构内力的影响规律,从理论上推导了岩土环状膨胀引起的附加荷载计算公式,并利用有限元分析软件ANSYS,建立了膨胀地层隧道模型并进行数值模拟。结合数值分析方法,研究了不同膨胀圈厚度情况下,地层环状膨胀对衬砌结构接触压力增量的影响。研究结果表明,膨胀荷载与岩土膨胀力大小、应力水平、地层抗力、膨胀后岩土的物性参数等因素有关,因环状岩土膨胀引起的衬砌压力增加值小于室内测得的岩土膨胀力;衬砌径向压力增加值与衬砌和深部围岩刚度、膨胀圈厚度成正相关关系;衬砌压力的增加值主要体现在结构轴力上,这对结构受力是有利的,从而轴力成了该结构设计的控制因素。研究成果为盾构隧道结构设计膨胀荷载的取值提供了依据。In order to obtain the influence law of expansive force resulted from the annular expansion in expansive layer on shield tunnel lining structure load,the equation of additional load caused by annular expansion is deduced and a computation model has been built and simulated numerically with the finite element analysis software ANSYS. The influence of annular expansion at various thickness of expansive ring on the contact pressure of tunnel lining structure was analyzed by numerical method. The results show that the expansive load is related to the expansive force,stress,ground resistance and material parameters of expanded soil,because the load of annular ground expansion added to the pressure on tunnel lining structure is less than the expansive force tested indoor. There is significant positive correlation between the stiffness of lining structure,the hardness of the deep surrounding rock,the thickness of the expansive ring with the added value of lining radial pressure. The added value of lining pressure is mainly embodied in the axial force which is beneficial to the lining structure. As a result,the axial force becomes the control factor of the structure design. This research can offer reference to the determination of expansive load in structure design of shield tunnel.

关 键 词：膨胀地层 盾构隧道 环状膨胀 衬砌结构 膨胀荷载 

分 类 号：TU457[建筑科学—岩土工程] U451[建筑科学—土工工程]