Failure Evolution and Instability Mechanism of Surrounding Rock for Close-Distance Parallel Chambers with Super-Large Section in Deep Coal Mines
Failure Evolution and Instability Mechanism of Surrounding Rock for Close-Distance Parallel Chambers with Super-Large Section in Deep Coal Mines
复制标题
深部煤矿超大断面近距离平行硐室围岩破坏演化及失稳机制
DOI：
10.1061/(asce)gm.1943-5622.0001998
复制
发表时间：
2021-05-01
影响因子：
3.7
通讯作者：
Ma, Qing
中科院分区：
文献类型：
--
作者：
Liu, Xuesheng;Fan, Deyuan;Ma, Qing
深井大断面、超大断面硐室围岩稳定性控制难度大，近距离硐室也是如此。以山东菏泽龙固煤矿某煤矸石分选系统超大断面硐室群现场地质条件为基础，建立FLAC 3D数值模拟模型，研究不同硐室间距和松动圈厚度条件下围岩的破坏演化规律。结果表明：随着药室间距的减小和松动圈厚度的增加，药室间的相互作用增强，临界药室间距（L-2）范围为15-10 m，临界松动圈厚度为4-5 m。在此基础上，分别建立了硐室间距和松动圈控制的围岩失稳力学模型。然后，从理论上得到L-2和不发生链失稳时的松弛圆半径（R*（a））。最后通过现场计算对理论进行验证。研究揭示了硐室围岩连锁失稳机理，为深部开采条件下近距离超大断面平行硐室设计提供了理论指导和参考。
The stability of surrounding rock for large or super-large section chambers is extremely hard to control in deep coal mines, as well as in close-distance chambers. Based on the on-site geological conditions of the super-large-section chamber group of a coal gangues separation system in Longgu Coal Mine, Heze City, Shandong, China, this paper will establish a FLAC3D numerical simulation model to research the failure evolution of the surrounding rock under different chamber spacings and thicknesses of the loosening circle. The results show that the interaction between chambers increased with the decrease of chamber spacing and the increase in the loosening circle thickness, the critical spacing (L-2) range was 15-10 m, and the critical thickness of the loosening circle was 4-5 m. Based on this, the instability mechanical models of the surrounding rock that is controlled by chamber spacing and loosening circle will be established, respectively. Then, L-2 and loosening circle radius without chain instability (R*(a)) will be obtained theoretically. Finally, the theoretical verification will be realized by on-site calculations. This research revealed the chain instability mechanism of the chamber surrounding rock and provided theoretical guidance and reference for the close-distance parallel chamber with a super-large section design under deep mining conditions.