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提出一种适用于TBM工法修建高地应力深部斜井的管片衬砌配合碎石可压缩层的让压支护技术。结合台格庙矿区TBM施工的长距离斜井工程,采用有限差分与离散元的耦合计算方法,从围岩塑性区发展、管片衬砌接触力、管片衬砌弯矩和轴力分析碎石可压缩层的让压效果,从碎石可压缩层的压缩变形路径和颗粒移动特征角度揭示碎石可压缩层的让压机制。研究结果表明:碎石可压缩层的密实度和地层的地应力分布情况影响其让压效应,密实度主要影响接触力的大小,而地应力条件主要影响接触力的形状,从而影响管片衬砌的内力分布形状和大小;碎石可压缩层的让压机制由相互嵌挤作用和错动移位作用两部分组成。不同地应力组合和不同的密实度时,嵌挤作用和错动移位作用各自发挥的程度不同,从而引起碎石的压缩变形路径差异,最终导致不同的让压效果。研究结果对未来TBM工法修建深部斜井的支护结构型式设计具有一定参考价值。
This paper presents a new technology of pressure-relief support for the compressible layer of the pipe lining combined with rubble which is suitable for the construction of deep inclined shaft with high ground stress by TBM method. Combined with the TBM long-distance incline project in Ta-gemiao mining area, finite element method and discrete element method are used to analyze the plasticity of rock mass from the plastic zone development of surrounding rock, the contact force of segment liner, The letting pressure effect of the compressive layer reveals the compressive mechanism of the compressible layer of gravel from the perspective of the compressive deformation path and particle movement characteristics of the compressible layer of the crushed stone. The results show that the compactness of compressible layer of gravel and the distribution of geostress of formation affect the size of contact force, which mainly affects the contact force, while the influence of geostress mainly affects the shape of contact force, The shape and size of the internal force distribution; gravel compressible layer to let pressure mechanism by mutual crowding squeeze action and dislocation of the two parts. Different combinations of stress and different densities, the role of embedded crowding and dislocation shift each play a different degree, which led to the crushing deformation of the compression path difference, and ultimately lead to different letting pressure effect. The results of this study have certain reference value for the design of the supporting structures for the construction of deep inclined shafts in the future TBM method.