不同围压下松软煤体力学特性与能量演化规律  

Mechanical Properties and Energy Evolution of Soft Coal under Different Confining Pressures

作　　者：孙福龙 杨杰 陈勇 吴教锟 李永元[1] 赵清全 张倍宁 周文斌 付树平 SUN Fulong;YANG Jie;CHEN Yong;WU Jiaokun;LI Yongyuan;ZHAO Qingquan;ZHANG Beining;ZHOU Wenbin;FU Shuping(Huaneng Coal Technology Co.,Ltd.,Beijing 100070,China;China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400037,China;State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;Yunnan Diandong Yuwang Energy Co.,Ltd.,Yuwang Coal Mine No.1 Well,Qujing 655000,China)

机构地区：[1]华能煤炭技术研究有限公司,北京100070 [2]中煤科工集团重庆研究院有限公司,重庆400037 [3]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [4]云南滇东雨汪能源有限公司雨汪煤矿一井,云南曲靖655000

出　　处：《沈阳理工大学学报》2023年第6期48-54,共7页Journal of Shenyang Ligong University

基　　金：华能集团总部科技项目(HNKJ19-H10);南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室开放基金项目(E22226);中国煤炭科工集团有限公司科技创新创业资金专项重点项目(2022-2-TD-ZD009)。

摘　　要：为揭示滇东矿区松软煤体在加载破坏过程中的力学特性和能量演化规律,基于MTS815.03岩石力学实验系统对原煤试样进行不同围压条件下的三轴压缩实验。结果表明:煤样的峰值应力、弹性模量与围压存在指数函数关系;峰值应变、泊松比随围压呈线性增加;围压效应使煤样的破坏从延塑性向脆性转变,破坏模式由局部剪切形态向整体劈裂形态发展;围压对煤样变形破坏过程中能量演化影响显著。随着围压的增大,极限弹性能与峰值总能量均呈近似线性增加,积聚的极限弹性能对煤样的破坏起重要作用,宏观表现为高围压条件下煤样破坏较低围压剧烈。In order to reveal the mechanical properties and energy evolution of soft coal dur-ing loading failure in eastern Yunnan mining area,conventional triaxial compression tests were carried out on raw coal samples under different confining pressures based on MTS815.03 rock mechanics test system.The results show that the peak stress and elastic modulus of coal samples have exponential function relationship with confining pressure;The peak strain and Poisson′s ratio increase linearly with confining pressure;The confining pres-sure effect makes the failure of the coal sample transform from ductile to brittle,and the fail-ure mode of the coal sample develops from local shear to global splitting;Confining pressure has a significant effect on the energy evolution of coal samples during deformation and fail-ure,and the elastic energy evolution curve is highly consistent with its stress-strain curve.With the increase of confining pressure,both the ultimate elastic energy and the peak total energy increase linearly.The accumulated ultimate elastic energy plays an important role in the failure of coal samples.Macroscopically,the failure of coal samples under high confining pressure is more severe than that under low confining pressure.

关 键 词：围压 三轴压缩 力学特性 弹性能 

分 类 号：TD315[矿业工程—矿井建设]