沿空留巷挡矸应力演变及围岩运动规律研究  

Stress Evolution of Blocking Gangue in Gob-Side Entry Retaining and Surrounding Rock Movement

作　　者：王壮 陈庆玉 陈庆钊 王在斌 WANG Zhuang;CHEN Qingyu;CHEN Qingzhao;WANG Zaibin(Shandong Qiuji Coal Mine Co.,Ltd.,Dezhou 251105,China)

机构地区：[1]山东省邱集煤矿有限公司,山东德州251105

出　　处：《山西煤炭》2021年第2期35-39,共5页Shanxi Coal

摘　　要：为了研究沿空留巷挡矸应力演变及围岩运动规律,以邱集煤矿1101工作面双重灰岩复合顶板为研究对象,采用切顶卸压沿空留巷技术进行开采。随着工作面推采,上覆岩层逐渐弯曲、下沉,与采空区垮落的矸石接触。利用GPD300矿用本安型充填体挡矸压力传感器和YHJ65J激光测距仪来监测采动影响下巷道挡矸支护应力及巷道变形规律。结果表明,挡矸压力在滞后工作面平均13 m位置处开始增长,在滞后工作面21.5 m出现首次稳定,滞后工作面55 m位置处出现第2次增长,两台监测仪器的监测结果最大值为3.02 kN,约为87 kPa;采用YHJ65J激光测距仪对留巷巷道收敛特性进行检测,发现顶底板移进量大于两帮收敛量,巷道挡矸效果明显。In order to study the stress evolution of blocking ganague in gob-side entry retaining and surrounding rock movement,taking the double limestone composite roof of the 1101 working face in Qiuji Mine as the research object,the roof cutting pressure releasing technology in the gob-side entry retaining was used in mining.With the advancing of the working face,the overlying rock strata gradually bent and sank,and then reached the gangue collapsed in the mined-out area;the GPD300 intrinsically safe filling body pressure sensor and YHJ65J laser range finder were used to monitor the supporting stress of blocking gangue under the influence of mining and roadway deformation.The results showed that:The blocking gangue pressure began increasing at average 13 m of the lagging working face,stabilized for the first time at 21.5 m,and increased for the second time at 55 m.The maximum monitoring value by the two monitoring instruments was 3.02 kN,about 87 kPa.With YHJ65J laser range finders,the convergence between roof and floor was found greater than that between two sides in the retaining roadway,which had distinct blocking gangue effects.

关 键 词：挡矸支柱 沿空留巷 巷道变形 压力 

分 类 号：TD325[矿业工程—矿井建设]