【摘要】：煤巷開挖時瞬間圍巖即出現(xiàn)異常的、較大的彈性變形行為,難以用胡克定律解釋。這表明即便是彈性變形階段,煤體也表現(xiàn)出強烈的非線性行為。這是由于煤體與其他巖石相比,分布著大量的孔隙、裂隙、層理、割理等諸多類型的缺陷,具有更加明顯的非均質(zhì)性。首先分析了煤體的非線性彈性特征,而后給出了其非線性彈性力學行為的本構方程,并進行了數(shù)值編程,實現(xiàn)了可以考慮煤體非線性彈性階段的彈塑性NLEPS本構模型,最后進行了有效的數(shù)值驗證,并在大尺度的煤巷開挖中進行了應用可行性分析。計算結(jié)果表明基于NLEPS本構模型的計算結(jié)果更為準確地反映了煤層巷道開挖卸載誘發(fā)的圍巖非線性變形行為。
[Abstract]:When coal roadway is excavated, abnormal and large elastic deformation appears in surrounding rock, which is difficult to be explained by Hook's law. This indicates that even in the elastic deformation stage, coal bodies exhibit strong nonlinear behavior. This is due to the fact that the coal body has more obvious heterogeneity than other rocks because of the distribution of many kinds of defects such as pores fractures bedding cleats and so on. Firstly, the nonlinear elastic characteristics of coal body are analyzed, then the constitutive equation of nonlinear elastic behavior of coal body is given, and numerical programming is carried out to realize the elastoplastic NLEPS constitutive model which can take into account the nonlinear elastic stage of coal body. Finally, effective numerical verification is carried out, and the feasibility analysis is carried out in large scale coal roadway excavation. The calculation results show that the calculation results based on NLEPS constitutive model reflect the nonlinear deformation behavior of surrounding rock induced by excavation and unloading of coal seam roadway more accurately.
【作者單位】： 中國礦業(yè)大學(北京)煤炭資源與安全開采國家重點實驗室;中國礦業(yè)大學(北京)資源與安全工程學院;煤炭開采國家工程技術研究院;深部煤炭開采與環(huán)境保護國家重點實驗室;
【基金】：國家自然科學基金資助項目(41272347) 國家科技支撐計劃資助項目(2013BAB02B01) 煤炭資源與安全開采國家重點實驗室開放基金資助項目(SKLCRSM16DCB01)
【分類號】：TD313

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相關碩士學位論文 前2條

1 張文正;幾類非線性彈性力學問題的解析解法[D];煙臺大學;2008年

2 高愛玲;一類非線性彈性力學方程組的邊值問題[D];遼寧師范大學;2013年

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本文編號：2383991