大倾角煤层长壁伪俯斜采场围岩应力演化及顶板破断特征  

Stress Evolution and Roof Breaking Characteristics of Surrounding Rock in Oblique Longwall Mining Area of Steeply Dipping Seam

作　　者：伍永平[1,2] 刘旺海 解盘石[1,2] 田双齐 WU Yongping;LIU Wanghai;XIE Panshi;TIAN Shuangqi(School of Energy Engineering,Xi’an University of Science and Technology,Xi'an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention of Ministry of Education,Xi’an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西安科技大学西部矿井开采及灾害防治教育部重点实验室,陕西西安710054

出　　处：《煤矿安全》2020年第9期222-227,共6页Safety in Coal Mines

基　　金：国家自然科学基金重点资助项目(51634007);国家自然科学基金面上资助项目(51774230)。

摘　　要：以绿水洞煤矿3132俯伪斜工作面为工程背景,研究了大倾角伪俯斜采场围岩应力演化、顶板破断及采场空间尺度特征。结果表明,大倾角伪俯斜采场围岩存在应力拱特性,沿走向呈对称性应力拱,沿倾斜方向呈非对称性应力拱;在工作面推进过程中,基本顶应力演化形态依次为楔形→倒立桃形→倒立梯形等主要形态;基本顶岩层在中上部区域呈拉、压破坏,在下部区域呈压破坏;伪俯斜采场支承应力峰值较真倾斜采场支承应力峰值略大,随开挖次数的增加支承应力峰值逐渐叠加产生累积效应;伪俯斜采场受顶板断裂、垮落"时序性"以及矸石充填"负约束效应"的影响,易形成空间尺度上大、下小的非对称性采场空间。Taking 3132 steeply dipping coal fully-mechanized oblique longwall mining working face in Lyushuidong Coal Mine as the engineering background,the aricle studies the stress evolution and roof fracture and the spatial scale characteristics of the steeply dipping coal oblique mining area.The results show that the surrounding rock of the steeply dipping coal oblique stope has stress arch characteristics,and the symmetry stress arch along the strike direction is asymmetric stress arch in the decline direction.When the working face is advanced,the main roof stress evolution form is wedge shape→inverted peach shape→inverted trapezoidal and other main forms;the main roof rock layer is tensile and compressive failure in the upper middle part,and the lower part is compressive failure.The peak of the supporting stress of the pseudo stope is slightly larger than the peak of the true inclined stope.As the number of excavation increases,the peak value of the supporting stress gradually increases to produce a cumulative effect.The slope of the pseudo stope is affected by the roof rupture,the"sequence"of the collapse and the"negative constraint effect"of the gangue filling,which is easy to form a large and small asymmetric stope space scale.

关 键 词：大倾角煤层 伪俯斜采场 应力演化 顶板垮落 采场空间 

分 类 号：TD323[矿业工程—矿井建设]