呼吉尔特矿区邻空巷对掘致冲风险分析及防治技术研究  

Risk analysis and prevention of rock burst during gob-side roadway breakthrough in Hujirt mining area

作　　者：段玉清 韩刚 郝晓琦 赵乾 DUAN Yuqing;HAN Gang;HAO Xiaoqi;ZHAO Qian(China Coal Energy Research Institute Co.,Lid.,Xi'an 710054,China;China Coal Rock Burst and Water Hazard Control Center,Ordos 017200,China;Menkeqing Coal Mine ZTHC ENERGY Co.,Ltd.,Ordos 017000,China)

机构地区：[1]中煤能源研究院有限责任公司,陕西西安安710054 [2]中煤冲击地压与水害防治研究中心,内蒙古鄂尔多斯017200 [3]中天合创能源有限责任公司门克庆煤矿,内蒙古鄂尔多斯017000

出　　处：《煤炭工程》2024年第3期75-83,共9页Coal Engineering

基　　金：国家自然科学基金项目(52174116)。

摘　　要：为研究呼吉尔特矿区厚硬顶板条件下小煤柱沿空掘巷贯通期间冲击地压机理,以门克庆煤矿11-3107回风巷贯通期间矿压显现为工程背景,建立了邻空巷贯通期间应力分布模型及FLAC3D数值模型,对比了距贯通点不同距离掘进工作面应力演化特征,揭示了邻空巷贯通期间冲击地压机理,并通过十字布点法、应力、微震等多种监测手段对巷道围岩变形、煤体应力进行了实测。基于机理分析和现场实测,提出卸压-支护一体化技术。结果表明:由于煤层顶板上方存在厚硬岩层,巷道开挖后,厚硬岩层通过应力传递作用于巷道围岩,使得滞后于掘进工作面的巷道顶底板及帮部发生较大变形;随着邻空巷掘进工作面距离贯通点越近,巷道变形量逐渐增大,通过巷道变形量的增加速率明确了距贯通点约160 m时,巷道变形量开始突增;微震事件主要集中在距贯通点190~60 m以内的巷道贯通区域,理论计算与现场矿压显现相符。In order to study the mechanism of rock burst during the gob-side roadway driving with small coal pillars underthick and hard roof in Hujirt mining area,the stress distribution model and FLAC~(3D)numerical model during the roadway breakthrough gob-side roadway were established based on the mine pressure behavior during the breakthrough of 11-3107 gob-side roadway in Menkeqing Coal Mine.The stress evolution characteristics of heading face at different distances from the roadway breakthrough point were compared,and the mechanism of rock burst during the roadway breakthrough of gob-side roadway was revealed.The deformation of roadway surrounding rock and coal body stress were measured by means of cross distribution method,stress,micro seismic and other monitoring methods.Based on mechanism analysis and field measurement,the integrated technology of pressure relief and support was proposed.The results show that due to the existence of thick and hard rock strata above the roof of the coal seam,after the excavation of the roadway,the thick and hard rock strata act on the surrounding rock of the roadway through stress transfer,resulting in large deformation of the roof,floor and side of the roadway lagging behind the tunneling head;As the tunneling head gets closer to the breakthrough point of the gob-side roadway,the deformation of the roadway gradually increases;According to the deformation increase rate of the roadway,when the tunneling head is about 160 m from the breakthrough point,the roadway deformation begins to increase sharply;the microseismic events mainly occurs in the roadway at 190~60 m from the roadway breakthrough point,and the theoretical calculation is consistent with the field mine pressure behavior.

关 键 词：巷道贯通 邻空巷道 应力传递 巷道支护 厚硬顶板 

分 类 号：TD324[矿业工程—矿井建设]