An analytical approach to estimate the mechanical state of roof strata in underground longwall mining

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-10-10 DOI:10.12989/GAE.2021.27.1.057
J. Zhang, Yansong Zhang, Wenzhou Du, Houwang Wang, M. Serati
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引用次数: 3

Abstract

The movement and collapse of roof strata in underground longwall mining is a key trigger factor for the occurrence of dynamic disasters. An accuracy estimation of roof strata mechanical state is critical for the prediction and control of dynamic disaster, such as coal burst and coal-and-gas outburst. An analytical approach is proposed in this work to estimate the mechanical state of roof strata in underground longwall mining. To do so, the unit width of roof strata is considered as a beam structure. A system of 4 simulations differential equations is proposed with 4 local slope data as input parameters to derive the mechanical expression of suspending roof strata. A differential evolution algorithm is further adapted to solve the equation system. In addition, a set of verification tests is carried out to showcase the feasibility and robustness of the proposed method. The results show that the average relative errors of 10 independent tests reach a high accuracy, which is less than 1% for the strata mechanical state control parameters. By using the estimated results, the slope, bending moment and shear force of suspending strata are derived. Moreover, the slope data sampling strategy is also devised. The parameters bound determination method is also proposed to ensure the calculation convergence. The local slope based analytical method proposed in this paper is a feasible approach to estimate the mechanical state of suspended roof strata before first weighting.
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地下长壁开采顶板受力状态的一种分析方法
地下长壁开采顶板岩层的移动和坍塌是动力灾害发生的关键触发因素。对顶板岩层力学状态的准确估计对于冲击煤、煤与瓦斯突出等动力灾害的预测和控制至关重要。本文提出了一种估算地下长壁开采顶板受力状态的解析方法。为此,将单位宽度的顶板岩层视为梁结构。以4个局部边坡数据为输入参数,建立了一个由4个模拟微分方程组成的系统,推导出悬浮顶板岩层的力学表达式。进一步采用微分进化算法求解该方程组。此外,还进行了一组验证测试,以验证所提出方法的可行性和鲁棒性。结果表明,10次独立试验的平均相对误差达到了较高的精度,岩层力学状态控制参数的平均相对误差小于1%。在此基础上,推导了悬索层的边坡、弯矩和剪力。此外,还设计了斜率数据的采样策略。为了保证计算的收敛性,提出了参数定界方法。本文提出的基于局部斜率的分析方法是一种可行的方法来估计悬顶岩层在首次称重前的受力状态。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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