柱旁单侧充填煤充结构体的破坏响应特征与失稳机制  

Failure response characteristics and mechanism of coal backfilling structures in single pillar-side backfilling

作　　者：崔博强 白锦文[1,2,3] 冯国瑞 王善勇[4] 王凯[1,2] 史旭东[1,2] 郭军[1,2,3] 杨欣宇 宋诚[1,2] CUI Boqiang;BAI Jinwen;FENG Guorui;WANG Shanyong;WANG Kai;SHI Xudong;GUO Jun;YANG Xinyu;SONG Cheng(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Shanxi Province for Mine Rock Strata Control and Disaster Prevention,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Cooking Coal Group Co.Ltd.,Taiyuan 030024,China;Priority Research Centre for Geotechnical Science&Engineering,The University of Newcastle,NSW 2308,Australia)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024 [2]太原理工大学矿山岩层控制及灾害防控山西省重点实验室,山西太原030024 [3]山西焦煤集团有限责任公司,山西太原030024 [4]纽卡斯尔大学岩土工程研究中心,澳大利亚纽卡斯尔2308

出　　处：《中南大学学报（自然科学版）》2023年第6期2431-2446,共16页Journal of Central South University:Science and Technology

基　　金：国家杰出青年科学基金资助项目(51925402);国家自然科学基金资助项目(52174125);山西省优秀青年基金资助项目(202103021222008)。

摘　　要：为研究柱旁单侧充填后“充填体-煤柱”协同承载结构体(BP煤充结构体)的破坏响应特征,首先,借助三维光学散斑监测仪和声发射系统,开展6组不同类型BP煤充结构体试样的单轴压缩试验,实时监测表面变形信息和试样破裂信号;其次,构建基于声发射特征的BP煤充结构体单轴压缩损伤模型;最后,揭示BP煤充结构体单轴压缩的失稳机制。研究结果表明:随着煤体元件体积占比的增加,BP煤充结构体的承载能力逐渐减小,弹性模量先减小后增大,而峰值应变先增大后减小。BP煤充结构体试样在单轴加载过程中,应变集中带首先出现在煤-充界面,其次出现在体积占比较大的元件中,最后出现在体积占比较小的元件中;最大声发射能量均出现在体积占比较大的元件中。BP煤充结构体试样的损伤会经历一个渐进损伤过程,主要包括初始损伤阶段、损伤发展阶段和损伤衰减阶段;煤体元件体积占比越大,BP煤充结构体损伤值增长越迅速,也更易造成结构体突然失稳;相反,充填体元件体积占比的增大会延缓BP煤充结构体试样的损伤速度。BP煤充结构体试样的失稳最早由煤-充界面的剪切破坏或拉伸破坏所引发,之后煤体元件或充填体元件发生联动破坏,导致BP煤充结构体试样丧失整体承载能力,并引发最终失稳。The aim of the study is to explore the failure response characteristics of the"backfilling body-coal pillar"cooperative bearing structure(BP coal-backfilling structure)in the pillar-side backfilling.Firstly,six groups of uniaxial compression tests were carried out for different types of BP coal-backfilling structure samples,the three-dimensional optical speckle monitor and acoustic emission system were used to capture the surface deformation information and sample fracture signal.Secondly,the damage model of BP coal-backfilling structure was constructed based on the acoustic emission characteristics.Finally,the failure mechanism of BP coal-backfilling structure under uniaxial compression was revealed.The results show that with the increase of coal volume ratios,the bearing capacity of BP coal-backfilling structure samples gradually decreases,the elastic modulus firstly decreases and then increases,and the peak strain firstly increases and then decreases.During the uniaxial loading process of BP coal-backfilling structure samples,the strain concentration zone appears earliest at the interface position,then appears in the element with the larger volume ratio,and the appearance relatively lags behind in the element with a small volume ratio.In addition,the maximum acoustic emission energy value occurs in element with large volume ratio.The BP coal-backfilling structure samples experience a gradual damage process,which mainly includes the initial damage stage,the damage development stage and the damage attenuation stage.The larger the volume ratio of coal elements,the faster the damage value of the BP coal-backfilling structure samples increases,and the more likely the sudden instability is to be caused.On the contrary,the damage rate of BP coal-backfilling structure samples can be slowed down by increasing volume ratio of the backfilling body element.The failure of the BP coal-backfilling structure sample is firstly induced by the shear failure or tensile failure of coal-backfilling interface,then,the coal element o

关 键 词：柱旁单侧充填 煤充结构体 单轴加载 破坏响应 失稳机制 

分 类 号：TD315[矿业工程—矿井建设]