深部矩形巷道围岩瞬间卸荷动态响应数值模拟

发布时间：2019-04-18 18:59

【摘要】：浅部不可再生资源的枯竭,矿业工程、水利水电以及交通工程的繁荣,极大的刺激了地下工程向深部的伸展转变。煤岩是一种特殊的可燃性固体沉积岩,有自己的力学特性,特别为深部脆性煤岩巷道开挖时表现出的变形、强度破坏特性。深部煤岩处在特殊的地球物理环境和复杂的应力场中,是与浅部岩体最根本不同的原因。深部特殊的地质条件、开挖诱发的多种问题,不同于传统理论上的浅部工程,浅部开挖的理论及经验不在适用于深部开挖。基于此,本文依据国内的某煤矿地下工程地质情况为背景,以脆性煤样矩形巷道为研究对象,运用有限差分数值仿真软件FLAC 3D对深部矩形巷道围岩瞬间卸荷动态响应进行了数值模拟研究。主要研究内容包括以下几个方面:1.采用Laurent级数利用保角变换建立矩形外域到单位圆内域的映射函数,通过边界条件和域域对应点等条件求解其映射函数。矩形巷道开挖按平面应变问题处理后,利用复变函数理论求解矩形巷道围岩应力解析解。2.利用快速拉格朗日数值仿真软件FLAC 3D建立深部矩形巷道围岩瞬态卸荷动态响应计算模型,模拟了围岩瞬态卸荷动态响应,结合动力学理论,对模拟结果进行分析,结合某巷道开挖的工程实例进行了验证。3.研究了地应力分布情况、开挖面面积、开挖面高宽比、距离掌子面距离、卸荷时间等影响因素对深部矩形隧道瞬态卸荷动力扰动效应的影响。本文的研究将为今后脆性围岩瞬态卸荷方面研究提供参考,对煤矿开采、隧道开挖等工程施工安全提供依据。
[Abstract]:The depletion of shallow non-renewable resources, the prosperity of mining engineering, water conservancy and hydropower, and transportation engineering have greatly stimulated the transformation of underground engineering to deep extension. Coal rock is a kind of special combustible solid sedimentary rock, which has its own mechanical properties, especially the deformation and strength failure characteristic of deep brittle coal roadway excavation. The deep coal and rock lies in the special geophysical environment and the complex stress field, which is the most fundamental difference from the shallow rock mass. Different from shallow engineering in traditional theory the theory and experience of shallow excavation are not suitable for deep excavation because of the special geological conditions and problems induced by excavation. Based on the background of underground engineering geology of a coal mine in China, this paper takes the rectangular roadway of brittle coal sample as the research object. The transient unloading dynamic response of surrounding rock of deep rectangular roadway is numerically simulated by using finite difference numerical simulation software FLAC 3D. The main research contents include the following aspects: 1. The mapping function from the rectangular outer domain to the inner domain of the unit circle is established by using the conformal transformation of the Laurent series. The mapping function is solved by the boundary conditions and the corresponding points in the domain. After the excavation of rectangular roadway is dealt with according to plane strain problem, the analytic solution of surrounding rock stress of rectangular roadway is solved by using the theory of complex variable function. 2. The calculation model of transient unloading dynamic response of surrounding rock of deep rectangular roadway is established by using fast Lagrangian numerical simulation software FLAC 3D, and the transient unloading dynamic response of surrounding rock is simulated. Based on the dynamic theory, the simulation results are analyzed. Combined with an engineering example of tunnel excavation, it is verified. 3. The influence of factors such as in-situ stress distribution, area of excavation surface, ratio of height to width of excavation surface, distance from palm surface and unloading time on transient unloading dynamic disturbance effect of deep rectangular tunnel is studied. The research in this paper will provide a reference for the study of transient unloading of brittle surrounding rock and provide a basis for the safety of coal mining tunnel excavation and other engineering construction.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD322

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