【摘要】：固體充填采煤技術(shù)有效解決了“三下”壓煤開采問題,在該技術(shù)中如何根據(jù)充填材料壓實力學特性來研究采場頂板運動是該技術(shù)發(fā)展的必然要求。本論文從充填矸石非線性彈性地基系數(shù)測定著手,根據(jù)側(cè)限壓縮試驗擬合出充填矸石非線性彈性地基反力表達式,并通過現(xiàn)場的應(yīng)力-變形量曲線實測得到了充填矸石非線性彈性地基系數(shù);在此基礎(chǔ)上綜合運用理論分析、數(shù)值模擬、工程實測的研究方法,建立了充填矸石非線性彈性地基直接頂受力分析模型,采用有限差分法和牛頓迭代法求解出了直接頂?shù)膿隙群蛢?nèi)力,分析了工作面不同推進長度對直接頂撓度和內(nèi)力的影響,通過以上研究方法共同驗證了非線性彈性地基的精確性。取得了以下研究成果:(1)提出了采用彈性地基系數(shù)大小表征充填矸石抗變形能力,并根據(jù)現(xiàn)場實測的應(yīng)力-變形量曲線,得到了充填矸石非線性彈性地基系數(shù)及其反力表達式,并建立了充填矸石非線性彈性地基直接頂受力分析模型;(2)采用有限差分法和牛頓迭代法求解出了直接頂?shù)膿隙群蛢?nèi)力,并與充填矸石線性彈性地基直接頂受力分析模型的結(jié)果進行比較,分析了工作面不同推進長度時兩種彈性地基直接頂在撓度和內(nèi)力的差異;建立了充填矸石非線性彈性地基頂板運動數(shù)值模擬模型,分析了工作面不同推進長度對直接頂撓度和內(nèi)力的影響;(3)通過翟鎮(zhèn)礦7203W充填工作面現(xiàn)場實測頂板下沉,得到了頂板下沉規(guī)律,驗證了采用非線性彈性地基表征充填矸石抗變形能力的精確性。
[Abstract]:Solid filling coal mining technology has effectively solved the problem of "three down" coal mining. In this technology, how to study the roof movement of stope according to the compaction mechanical characteristics of filling material is the inevitable requirement of the development of this technology. In this paper, the nonlinear elastic foundation coefficient of filling gangue is measured, and the reaction expression of nonlinear elastic foundation filled with gangue is fitted according to the lateral limit compression test. The coefficient of nonlinear elastic foundation filled with gangue is obtained by measuring the stress-deformation curve in the field, and the research methods of theoretical analysis, numerical simulation and engineering measurement are used synthetically. The direct roof force analysis model of the nonlinear elastic foundation filled with gangue is established. The deflection and internal force of the direct roof are solved by using the finite difference method and Newton iteration method, and the influence of different advancing lengths of the working face on the deflection and internal force of the direct roof is analyzed. The accuracy of nonlinear elastic foundation is verified by the above research methods. The following research results are obtained: (1) the elastic foundation coefficient is proposed to represent the deformation resistance of filling gangue, and according to the stress-deformation curve measured in the field, the nonlinear elastic foundation coefficient and its reaction force expression are obtained. The direct roof force analysis model of the nonlinear elastic foundation filled with gangue is established. (2) the deflection and internal force of the direct roof are solved by using the finite difference method and Newton iteration method. The difference of deflection and internal force between the two kinds of elastic foundation with different advancing lengths is analyzed by comparing with the results of the direct top force analysis model of the linear elastic foundation filled with gangue, and the results are compared with the results of the direct top force analysis model of the filling gangue linear elastic foundation. A numerical simulation model of roof movement in nonlinear elastic foundation with filling gangue is established, and the influence of different advancing lengths on the deflection and internal force of the direct roof is analyzed. (3) the roof subsidence is measured at 7203W filling face in Zhai Zhen Coal Mine. The law of roof subsidence is obtained, and the accuracy of using nonlinear elastic foundation to characterize the deformation resistance of filling gangue is verified.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD823.7

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