【摘要】：淺部不可再生資源的枯竭,礦業(yè)工程、水利水電以及交通工程的繁榮,極大的刺激了地下工程向深部的伸展轉(zhuǎn)變。煤巖是一種特殊的可燃性固體沉積巖,有自己的力學特性,特別為深部脆性煤巖巷道開挖時表現(xiàn)出的變形、強度破壞特性。深部煤巖處在特殊的地球物理環(huán)境和復雜的應力場中,是與淺部巖體最根本不同的原因。深部特殊的地質(zhì)條件、開挖誘發(fā)的多種問題,不同于傳統(tǒng)理論上的淺部工程,淺部開挖的理論及經(jīng)驗不在適用于深部開挖�；诖�,本文依據(jù)國內(nèi)的某煤礦地下工程地質(zhì)情況為背景,以脆性煤樣矩形巷道為研究對象,運用有限差分數(shù)值仿真軟件FLAC 3D對深部矩形巷道圍巖瞬間卸荷動態(tài)響應進行了數(shù)值模擬研究。主要研究內(nèi)容包括以下幾個方面:1.采用Laurent級數(shù)利用保角變換建立矩形外域到單位圓內(nèi)域的映射函數(shù),通過邊界條件和域域?qū)c等條件求解其映射函數(shù)。矩形巷道開挖按平面應變問題處理后,利用復變函數(shù)理論求解矩形巷道圍巖應力解析解。2.利用快速拉格朗日數(shù)值仿真軟件FLAC 3D建立深部矩形巷道圍巖瞬態(tài)卸荷動態(tài)響應計算模型,模擬了圍巖瞬態(tài)卸荷動態(tài)響應,結合動力學理論,對模擬結果進行分析,結合某巷道開挖的工程實例進行了驗證。3.研究了地應力分布情況、開挖面面積、開挖面高寬比、距離掌子面距離、卸荷時間等影響因素對深部矩形隧道瞬態(tài)卸荷動力擾動效應的影響。本文的研究將為今后脆性圍巖瞬態(tài)卸荷方面研究提供參考,對煤礦開采、隧道開挖等工程施工安全提供依據(jù)。
[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.
【學位授予單位】：河北工程大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD322

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