多孔洞试件充填强化的力学特性与失稳模式  

Mechanical properties and instability mode of multi-hole cement specimens strengthened by filling

作　　者：辛亚军[1,2] 董帅 姬红英 王宇[1] 杨俊鹏 XIN Yajun;DONG Shuai;JI Hongying;WANG Yu;YANG Junpeng(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Collaborative Innovation Center ofCoal Work Safety,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Institute of Resources and Environment,Henan Polytechnic Uni-versity,Jiaozuo 454000,Henan,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]河南理工大学煤炭安全生产河南省协同创新中心,河南焦作454000 [3]河南理工大学资源环境学院,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2023年第2期144-152,共9页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51174078,51374091);河南省科技攻关计划项目(172102310639);新疆维吾尔自治区区域协同创新项目(2017E0209);深井瓦斯抽采与围岩控制技术国家地方联合工程实验室开放基金资助项目(SJF201801)。

摘　　要：为探讨矿山巷道围岩钻孔卸压后充填强化的承载特性,基于多孔洞试件应力分布与裂纹发展形态分析,在实验室利用刚性试验机对2组8个多孔洞试件进行单轴压缩力学试验,确立充填前后多孔洞试件破坏形态与失稳模式。结果表明:多孔洞试件内部自由面增多,应力集中重叠明显,孔洞周边起裂明显;孔洞数越多,多孔洞试件强度越小,但充填后强度均得到强化,提高了3.37%~16.78%;在充填体强度低于多孔洞基体强度下,充填前后多孔洞试件的轴向变形随孔洞数增加而减小,相对于无充填试件,孔洞越少,充填试件变形越小;充填试件破坏路径分为沿弱胶结面破坏和沿充填体撕裂破坏,充填与无充填试件分别呈曲线自主与块体供向失稳。研究结果可为深部巷道卸压孔洞围岩充填参数选择提供理论参考。For discovering bearing characteristics on filling reinforced surrounding rock in mining gateway after borehole pressure relief,uniaxial compression mechanical tests were operated on two groups of eight multi-hole specimens by rigid testing machine on the basis of analysis on stress distribution and crack de⁃velopment of multi-hole specimen.Instability modes and failure forms of multi-hole specimens before and af⁃ter being filled were determined.The results showed that,free surface increased in multi-hole specimens,stress concentrated and overlapped obviously,and cracking around hole was obvious.The more the hole number was,the smaller the strength of multi-hole specimen was,while the strength of filled specimen was higher than the no-filled one,the strengthen ranges were 3.37%~16.78%.When filling material strength was less than multi-hole specimen,axial deformation of filled multi-hole specimen decreased with hole num⁃ber increasing.Compared with the no-filled specimen,the less hole number was,the smaller the deformation of filled specimen was.Failure ways of filled specimen was divided into two types:the failures along weak bonding surface and along filled mass,and the filled and no-filled specimens showed respectively curve free instability and block directional one.The research results could provide reference for the filling parameter selection of relief-pressure hole in deep gateway surrounding rock.

关 键 词：多孔洞试件 充填强化 多孔成线 失稳模式 

分 类 号：TU452[建筑科学—岩土工程]