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An Innovative Approach for Gob-Side Entry Retaining by Roof Cutting in Steeply Pitching Seam Longwall Mining with Hard Roof: a Case Study
Mining, Metallurgy & Exploration ( IF 1.9 ) Pub Date : 2020-05-06 , DOI: 10.1007/s42461-020-00219-4
Li Zhang , Jing Zhao , Chuanwei Zang , Shuanlin Wang

The application of gob-side entry retaining (GER) in steeply pitching seam longwall mining with a hard roof has always been a difficult problem. Based on the simplified roof beam mechanical model, the traditional gob-side entry retaining by packing (GERP) roof structure evolution process and its problems with use in steeply pitching seams are analyzed. Therefore, based on the unique characteristics of the gangue rolling and accumulating in the steeply pitching seam, this contribution proposes an innovative method of gob-side entry retaining by roof cutting (GERRC) in steeply pitching seam and details its technical process. The roof structures of the GERRC and the GERP are compared. Taking the Chang Gouyu Coal Mine as a case study, field experiments were carried out. This research finds that the GERRC can both overcome the impact of rolling gangue on roadside support and make the rolling and stacking gangue become a roadside support. The roof structure of the GERRC is in a one-time statically indeterminate state, which is conducive to the stability of the roadway. In the field test, the total displacement of the roadway roof and floor is 97 mm, the supporting pressure of the serried single props is less than 28 MPa, and the props have no obvious bending phenomenon.

中文翻译:

硬顶板大斜距煤层长壁开采沿空留巷创新方法

沿空留巷(GER)在硬顶板大斜煤层长壁开采中的应用一直是一个难题。基于简化的顶梁力学模型,分析了传统沿空留填(GERP)顶板结构演化过程及其在大倾角煤层中的应用问题。因此,本文根据陡倾煤层脉石滚动堆积的独特特点,提出了一种创新性的陡倾煤层沿空截顶留空(GERRC)方法,并详细介绍了其工艺流程。GERRC 和 GERP 的屋顶结构进行了比较。以长沟峪煤矿为例,开展了现场试验。本研究发现,GERRC既可以克服滚动矸石对路边支护的影响,又可以使滚动堆积的脉石成为路边支护。GERRC顶板结构处于一次性静不定状态,有利于巷道的稳定。现场试验中,巷道顶底板总位移为97 mm,串联单支支柱支撑压力小于28 MPa,支柱无明显弯曲现象。
更新日期:2020-05-06
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