摘要
针对王庄煤矿9105工作面受构造应力影响导致的大断面巷道变形严重问题,采用数值模拟与现场监测相结合的方法,研究了大断面巷道变形特征及其围岩控制技术。分析表明,巷道断面尺寸效应在4.5 m×4.5 m以上时表现更加突出,不利于巷道稳定;随着侧压系数的增加,巷道顶底板及两帮移近量均呈现增加趋势,侧压系数越大,巷道变形增加越剧烈;9105工作面巷道由于宽度较大,导致巷道顶板及两帮变形严重。据此设计了大断面巷道采用“高强度螺纹钢锚杆+预应力锚索+金属网+工字钢棚”联合支护技术。通过工程实践,顶底板移近量降低48.1%,两帮移近量降低55.4%,实现了构造巷道的有效控制。
Aiming at the serious deformation problem of the large section roadway caused by structural stress in the 9105 working face of Wangzhuang Coal Mine,a combined method of numerical simulation and on-site monitoring is used to study the deformation characteristics of the large section roadway and its surrounding rock control technology.The analysis shows that when the size effect of the roadway cross section is above 4.5 m×4.5 m,the performance becomes more prominent,which is not conducive to the stability of the roadway.With the increase of the lateral pressure coefficient,each of the movement amount of the roof,floor,and two sides of the roadway shows an increasing trend.The larger the lateral pressure coefficient,the more severe the deformation of the roadway.Due to the relatively large width of the 9105 working face roadway,the deformation of the roadway roof and two sides is severe.Based on this,a combined support technology of"high-strength threaded steel anchor rod+prestressed anchor cable+metal mesh+I-shaped steel shed"is designed for the large cross section roadway.Through engineering practice,the movement amount of the roof and floor reduced by 48.1%,and the movement amount of the two sides reduced by 55.4%,achieving effective control of the construction of the roadway.
作者
杜晓刚
Du Xiaogang(Shanxi Lu'an Environmental Protection Energy Development Co.,Ltd.Wangzhuang Coal Mine,Shanxi Changzhi 046000)
出处
《山东煤炭科技》
2024年第1期1-5,共5页
Shandong Coal Science and Technology
关键词
构造应力
大断面巷道
变形特征
围岩控制
支护
structural stress
large cross section roadway
deformation characteristic
surrounding rock control
support
