摘要
深部煤炭资源开采的强度和深度不断增加,深部巷道围岩的结构性失稳灾变问题日趋严峻、复杂,严重制约深部煤炭安全高效开采。鉴于深部巷道围岩结构变形失稳的渐进演化过程中释放多物理场响应信息,采用自主研制的深部地下工程结构变形失稳全过程模拟试验系统,配合声发射、并行电法、电磁辐射等监测系统,研究基于多源信息表征的深部巷道围岩结构灾变演化机理。开展了完整、层状和块状3种结构围岩的破坏性物理模型试验,利用声、电、磁多源信息演化规律对不同结构围岩的荷载-位移全过程进行了定量化评价和多源信息表征,从荷载-位移全程曲线、多源信息响应规律、围岩峰后损伤特性3个角度综合揭示了不同结构围岩的灾变演化及变形失稳机制。研究结果表明:(1)随着围岩完整性的降低,围岩由塑性破坏向脆性破坏转变,其变形破坏过程的波动性和渐进式破坏特征更加显著,层状和块状结构围岩的物理模型峰值承载能力相比于完整结构分别降低4.73%和20.73%;(2)与完整结构围岩的声、电、磁多源信息的连续性响应过程不同,层状和块状结构围岩呈现出阶段式响应规律且特征值更突出,尤其块状结构围岩的阶段跳跃性现象显著;(3)完整、层状和块状结构围岩的裂隙发育区面积依次为448.84、651.76和824.49 cm^(2),即随着围岩结构完整性的降低,裂隙发育区面积不断增大,在本研究中增大范围在1.5~1.9倍;(4)围岩的破坏失稳由完整结构的强度控制型向块状结构的结构控制型转变,而层状结构表现出强度-结构联合控制特征,围岩破坏失稳的结构效应越来越显著。
As the intensity and depth of deep coal mining continue to increase,the disaster caused by the structural instability of deep roadway surrounding rock becomes increasingly severe and complex,which seriously restricts the safe and efficient mining of deep coal resources.To investigate the multiple physical response information of deep roadway surrounding rock in the gradual evolution of deformation and instability,a self-developed simulation system for the complete process of deformation and instability of deep underground engineering structure was used,with the acoustic emission,parallel electrical method,electromagnetic radiation monitoring system,to carry out the destructive physical model tests of intact,layered and massive surrounding rock structures.The whole process of load-displacement of surrounding rock with different structures was quantitatively analyzed and characterized based on the evolution law of acoustic emission,apparent resistivity and electromagnetic radiation multi-source information.The disaster evolution and instability mechanisms of surrounding rocks with different structures were comprehensively revealed from the perspectives of load-displacement curve,multi-source information response law and post-peak damage characteristics of surrounding rocks.The results show that(1)With the decrease of rock structural integrity,the roadway surrounding rock changes from plastic failure to brittle failure,and its deformation and failure process is characterized by volatility and progressive failure.Compared with the intact structure,the equivalent peak bearing capacities of layered and massive surrounding rocks decrease by 4.73%and 20.73%,respectively.(2)Different from the continuous response process of the acoustic emission,apparent resistivity and electromagnetic radiation multi-source information of the intact structure surrounding rock,the layered and massive structure surrounding rocks show the phase response law,and the characteristic value is more prominent,showing the phase jump law.(3)The areas of fracture zones in intact,layered and massive structures are 448.84,651.76 and 824.49 cm~2,respectively.With the decrease of the structural integrity of surrounding rock,the area of fracture zones increases continuously,ranging from 1.5 to 1.9 times in this study.(4)The instability mechanism of surrounding rock changes from the strength control type of intact structure to the structure control type of massive structure,while the layered structure shows the characteristics of combined strength and structure control.And the structural effect of surrounding rock failure and instability is becoming more and more significant.
作者
靖洪文
赵振龙
吴疆宇
JING Hongwen;ZHAO Zhenlong;WU Jiangyu(State Key Laboratory far Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Civil Engineering and Architecture,Linyi Unwersity,Linyi 276000,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2023年第1期163-176,共14页
Journal of China Coal Society
基金
国家自然科学基金资助项目(51734009,52074259,52004272)。
关键词
灾变演化
围岩结构
深部巷道
多源信息
荷载-位移全过程
disaster evolution
surrounding rock structure
deep roadway
multi-source information
whole loading-displacement curve
