Ground pressure and overlying strata structure for a repeated mining face of residual coal after room and pillar mining
Ground pressure and overlying strata structure for a repeated mining face of residual coal after room and pillar mining
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DOI：
10.1016/j.ijmst.2016.05.017
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发表时间：
2016-07-01
影响因子：
11.8
通讯作者：
Jin Gan
中科院分区：
文献类型：
--
作者：
Jiang Bangyou;Wang Lianguo;Jin Gan
为研究房柱式开采后残余煤综采复采的异常地压及顶板控制问题，采用数值模拟和理论分析相结合的方法，建立了顶板断裂结构模型和力学模型。揭示了复采工作面顶板破裂特征，得出了复采工作面矿压规律及顶板支护条件。结果表明，复采工作面通过残留煤柱时，由于突失失稳定，老采空区上方老顶发生破裂，在工作面上方形成超大型岩块。老顶超前破断后，形成了相对稳定的“伏索梁”结构。复采工作面过老采空区时，由于大块岩块旋转接触矸石，在覆岩荷载作用下发生二次破碎。对山西省某综合矿山进行了实例计算，结果表明，复采工作面通过残留煤柱和空区时，确定合理的支架最小工作阻力值分别为11,412 kN和10,743 kN。现场矿压监测结果表明，所建立的力学模型和支护阻力计算是合理的。(C)2016由Elsevier B. V.代表中国矿业大学出版。
To investigate the abnormal ground pressures and roof control problem in fully mechanized repeated mining of residual coal after room and pillar mining, the roof fracture structural model and mechanical model were developed using numerical simulation and theoretical analysis. The roof fracture characteristics of a repeated mining face were revealed and the ground pressure law and roof supporting conditions of the repeated mining face were obtained. The results indicate that when the repeated mining face passes the residual pillars, the sudden instability causes fracturing in the main roof above the old goaf and forms an extra-large rock block above the mining face. A relatively stable "Voussoir beam" structure is formed after the advance fracturing of the main roof. When the repeated mining face passes the old goaf, as the large rock block revolves and touches gangue, the rock block will break secondarily under overburden rock loads. An example calculation was performed involving an integrated mine in Shanxi province, results showed that minimum working resistance values of support determined to be reasonable were respectively 11,412 kN and 10,743 kN when repeated mining face passed through residual pillar and goaf. On-site ground pressure monitoring results indicated that the mechanical model and support resistance calculation were reasonable. (C) 2016 Published by Elsevier B.V. on behalf of China University of Mining & Technology.