基于非线性弹性地基梁的充填采场顶板运动研究

发布时间：2018-08-21 14:02

【摘要】：固体充填采煤技术有效解决了“三下”压煤开采问题,在该技术中如何根据充填材料压实力学特性来研究采场顶板运动是该技术发展的必然要求。本论文从充填矸石非线性弹性地基系数测定着手,根据侧限压缩试验拟合出充填矸石非线性弹性地基反力表达式,并通过现场的应力-变形量曲线实测得到了充填矸石非线性弹性地基系数;在此基础上综合运用理论分析、数值模拟、工程实测的研究方法,建立了充填矸石非线性弹性地基直接顶受力分析模型,采用有限差分法和牛顿迭代法求解出了直接顶的挠度和内力,分析了工作面不同推进长度对直接顶挠度和内力的影响,通过以上研究方法共同验证了非线性弹性地基的精确性。取得了以下研究成果:(1)提出了采用弹性地基系数大小表征充填矸石抗变形能力,并根据现场实测的应力-变形量曲线,得到了充填矸石非线性弹性地基系数及其反力表达式,并建立了充填矸石非线性弹性地基直接顶受力分析模型;(2)采用有限差分法和牛顿迭代法求解出了直接顶的挠度和内力,并与充填矸石线性弹性地基直接顶受力分析模型的结果进行比较,分析了工作面不同推进长度时两种弹性地基直接顶在挠度和内力的差异;建立了充填矸石非线性弹性地基顶板运动数值模拟模型,分析了工作面不同推进长度对直接顶挠度和内力的影响;(3)通过翟镇矿7203W充填工作面现场实测顶板下沉,得到了顶板下沉规律,验证了采用非线性弹性地基表征充填矸石抗变形能力的精确性。
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD823.7

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