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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 rule of expansion load caused by annular expansion of expansive rock strata on the internal force of shield tunnel lining structure, the formula of additional load caused by annular expansion of rock and soil is theoretically deduced. With the help of finite element analysis software ANSYS, Expansion tunnel model and numerical simulation. Combined with numerical analysis method, the influence of formation ring expansion on the contact pressure increase of lining structure under different thickness of expansion ring was studied. The results show that the expansion load is related to the size of the rock expansion, the stress level, the resistance of the formation and the physical parameters of the rock after expansion. The added value of the lining pressure caused by the expansion of the annular rock is less than the measured expansion of the rock The increase of lining radial pressure has a positive correlation with the rigidity of lining and deep surrounding rock and the thickness of expansion ring. The added value of lining pressure is mainly reflected in the structural axial force, which is favorable for the bearing of the structure, so that the axial force becomes The structural design of the control factors. The research results provide the basis for the design of expansion tunnel load.