Ground response of entries driven adjacent to a retreating longwall panel
Ground response of entries driven adjacent to a retreating longwall panel
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靠近后退长壁面板驱动的入口的地面响应
DOI：
10.1016/j.ijrmms.2021.104630
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发表时间：
2021-01-22
影响因子：
7.2
通讯作者：
Zhao Deshuai
中科院分区：
文献类型：
--
作者：
Zhang Guangchao;Zang Chuanwei;Zhao Deshuai
采用现场观测与数值模拟相结合的方法，研究了后移综放面邻近巷道的稳定性规律及控制方法。试验地点位于中国山西省运城市。观测结果表明，沿后退盘区巷道的变形破坏过程可分为3个阶段：缓慢的初始增长阶段（开采盘区前方125米以上），快速持续增加阶段（面板前方125米至面板后方-100米）和加速增加阶段（面板后方-100米至-200米）。数值模拟得到的两个肋的应力变化证实了所描述的开采扰动的演变。同时，数值模拟结果也表明，顶板预裂处理可显著降低煤柱和盘区帮的峰值应力，从而减少煤岩破坏和巷道收敛。根据试验场地的岩层条件和巷道的地面响应，确定了顶板预裂处理的具体参数，并在现场进行了初步应用。现场应用表明，所提出的顶板预裂方案显著改善了采区顺槽的性能。研究结果有助于加深对EDRLP的地面响应及其与顶板岩层移动的相关性的认识。此外，本文提出的顶板预裂处理的控制策略和设计原则也具有一定的工程应用价值。
This paper presents an integrated approach for field instrument and numerical modeling to investigate the stability principle and control method of entries that are driven adjacent to a retreating longwall top coal caving panel. The test site is located in the city of Yuncheng, Shanxi Province, China. The instrument results indicated that the deformation and failure process of entries driven adjacent to the retreating longwall panel (EDRLP) could be divided into three stages: a slow initial increase stage (more than 125 m ahead of the mining panel), a rapid and continuous increase stage (125 m ahead of the panel to -100 m behind the panel), and an accelerating increase stage (-100 m to -200 m behind the panel). The stress changes in two ribs obtained with numerical modeling confirmed the described evolution of the mining disturbance. Meanwhile, numerical modeling results also suggested that a roof pre-splitting treatment could significantly decrease the peak stress in the coal pillar and panel rib, thus decreasing coal/rock mass failures and entry convergences. Furthermore, based on the rock formation condition of the test site and the ground response of entries, the detailed parameters of the roof pre-splitting treatment were determined and tentatively applied in the field. The field application suggested significantly improved gateroad performance with the proposed roof pre-splitting scheme. This study's results can help to increase understanding of the ground response of the EDRLP and correlations with roof strata movement. In addition, the proposed control strategy and design principle of the roof pre-splitting treatment can potentially be applied to other projects.