岩-煤组合体试样变形场与能量演化特征试验研究  

Experimental study on deformation field and energy evolution characteristics of rock-coal composite samples

作　　者：孔凯 尹大伟[1,3] 张虎 朱海峰 李法鑫 孙德全 张士川 王沉 KONG Kai;YIN Dawei;ZHANG Hu;ZHU Haifeng;LI Faxin;SUN Dequan;ZHANG Shichuan;WANG Chen(State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Shandong Energy Northwest Mining Yongming Coal Mine,Yan′an,Shannxi 717300,China;Shandong Deep Rockburst Disaster Assessment Engineering Laboratory,Jinan,Shandong 250104,China;Shandong Institute of Coalfield Geological Planning and Survey,Jinan,Shandong 250104,China;Zaozhuang Wangchao Coal Mine Company of Limited Liability,Zaozhuang,Shandong 277518,China;Mining College,Guizhou University,Guiyang,Guizhou 550025,China)

机构地区：[1]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590 [2]山东能源西北矿业永明煤矿,陕西延安717300 [3]山东省深部冲击地压灾害评估工程实验室,山东济南250104 [4]山东省煤田地质规划勘察研究院,山东济南250104 [5]枣庄王晁煤矿有限责任公司,山东枣庄277518 [6]贵州大学矿业学院,贵州贵阳550025

出　　处：《山东科技大学学报（自然科学版）》2022年第5期30-39,共10页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51904167,52074169);山东省深部冲击地压灾害评估工程实验室开放课题(鲁煤研开(2020)003号)。

摘　　要：采用数字散斑应变测量系统进行灰岩-煤组合体试样单轴压缩变形破坏演化试验,分析组合体试样变形局部化带和能量演化特征,揭示其渐进破坏机制。组合体试样变形局部化带演化主要与其内部原生裂纹起裂、扩展有关,变形局部化带首先出现在原生裂纹区域,沿最大主应力方向发育扩展,煤样内变形局部化带发育扩展相对较快,变形局部化带交汇、贯通导致组合体试样整体破坏失稳。变形局部化带位移错动量演化主要经历微变化、线性缓慢增长、非线性加速增长3个阶段,与轴向应力变化基本相对应,峰后变形局部化带快速扩展贯通,位移错动量非线性加速增长。外界输入能量主要被煤样变形破坏所消耗,煤样首先发生渐进破坏而释放能量,交界面处灰岩、煤样由协同变形转为非协同变形;煤样破坏诱发灰岩回弹变形并释放弹性能,部分弹性能作用于煤样而加剧其破坏,煤样发生拉-剪混合破坏;煤样内裂纹扩展传播至灰岩内,并与灰岩内裂纹贯通,导致其拉伸破坏。The digital speckle strain measurement system was adopted to conduct uniaxial compression deformation and failure evolution tests on limestone-coal composite samples.The evolution characteristics of the deformation localization zone and energy of the composite samples were analyzed and the progressive failure mechanism was revealed.Mainly related to the internal initiation and propagation of primary cracks in the limestone-coal composite,the deformation localization zones first appeared around the primary cracks and then developed and expanded along the maximum principal stress direction.The deformation localization zones within the coal samples developed and expanded relatively rapidly.The intersection and penetration of deformation localization zones led to the overall failure and instability of the composite samples.The displacement dislocations of deformation localization zones mainly experienced three stages:Micro-change stage,linear slow growth stage,and nonlinear accelerated growth stage,roughly corresponding to the variations of axial stress.After the peak stress point,the deformation localization zones expanded and penetrated rapidly and the displacement dislocations increased nonlinearly.The external input energy was mainly consumed by the deformation and failure of coal samples,which released energy due to the progressive failure.At the same time,the limestone and coal samples at the interface changed from cooperative deformation to non-cooperative deformation.The failure of coal samples induced the rebound deformation of limestone and the release of elastic properties within it,part of which acted on the coal samples to aggravate their failure,resulting in the tensile-shear failure.The cracks in the coal samples propagated into the limestone and penetrated with the cracks in it,leading to the tensile failure of the limestone.

关 键 词：岩-煤组合体 数字散斑 变形场 变形局部化带 弹性变形能 

分 类 号：TD315[矿业工程—矿井建设]