刚度差异对岩石破裂影响的颗粒流模拟研究  

Influence of stiffness difference on rock fracture based on particle flow simulation

作　　者：陈军涛[1,2,3] 李昊 褚衍玉[4] 张毅 唐道增 朱君 李文昕 王开宇 CHEN Juntao;LI Hao;CHU Yanyu;ZHANG Yi;TANG Daozeng;ZHU Jun;LI Wenxin;WANG Kaiyu(College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;State Key Laboratory of Coal Mining and Clean Vtilization,Beijing 100013,China;Qiuji Coal Mine,Shandong Energy Linyi Mining Group Co.Ltd,Dezhou,Shandong 251105,China;China Academy of Safety Science and Technology,Beijing 100012,China;College of Electrical Engieering and Automation,Shandong University of Sciecience and Technology,Qingdao,Shandong 266590,China)

机构地区：[1]山东科技大学能源与矿业工程学院,山东青岛266590 [2]煤炭资源高效开采与洁净利用国家重点实验室,北京100013 [3]山东能源临沂矿业集团有限责任公司邱集煤矿,山东德州251105 [4]中国安全生产科学研究院,北京100012 [5]山东科技大学电气与自动化工程学院,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2022年第2期51-59,共9页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51974172);山东省自然科学基金项目(ZR2020ME102);煤炭资源高效开采与洁净利用国家重点实验室项目(2021-CMCU-KF015);山东科技大学研究生科研创新资助项目(YC20211441,YC20211420);山东科技大学科研创新团队支持计划项目(2018TDJH102)。

摘　　要：为研究矿物颗粒与胶结物刚度差异对岩石破裂的影响,基于平行黏结模型开展了不同颗粒有效模量、黏结有效模量下的压缩、拉伸试验研究。结果表明:颗粒有效模量与压弹性模量相关性最大,黏结有效模量与拉弹性模量相关性最大,同时受黏结有效模量影响的宏观参数包含且多于颗粒有效模量,优先标定黏结有效模量有助于提高模拟试验的准确性。固定黏结有效模量时,颗粒有效模量越大,岩体稳定性越好;固定颗粒有效模量时,黏结有效模量越大,颗粒稳定性越差;当两种有效模量增大时,模型易出现脆性破坏,反之易出现塑性破坏;刚度差异系数值反映了模型内部颗粒刚度和胶结体刚度的差别,刚度差异系数值越小,模型越容易产生裂隙,即矿物颗粒的刚度越大岩石越稳定,胶结物的刚度越大岩石越容易出现裂隙。最后利用试验实例验证了结论的准确性。In order to investigate the influence of differences in stiffness between mineral particles and cement on rock fracture,this paper carries out a study of compression and tension tests under effective modulus of different particles and effective modulus of cement based on the parallel bond model.The results show that the effective modulus of particles is the most correlated with the elastic modulus under compression and the effective modulus of bond is the most correlated with the tensile elastic modulus.The macroscopic parameters affected by the effective modulus of bond include and are more than the effective modulus of particles.When the effective modulus of bond is fixed,the greater the effective modulus of particles is,the better the stability of the rock mass becomes.When the effective modulus of particles is fixed,the greater the effective modulus of bond is,the less stable the particles become.When the effective modulus of the two types of particles increases,the model is more prone to brittle damage and vice versa.The value of the coefficient of stiffness difference reflects the difference between the stiffness of the particles and the stiffness of the bond within the model.The smaller the value of the coefficient of stiffness difference is,the more likely the model is to produce.The smaller the value of the coefficient of difference in stiffness is,the more likely the model is to fracture.In other words,the greater the stiffness of the mineral particles is,the more stable the rock becomes;the greater the stiffness of the cement is,the more likely it is to fracture.Finally,the accuracy of the conclusions is verified by test examples.

关 键 词：颗粒流 颗粒有效模量 平行黏结模量 裂纹扩展 刚度 

分 类 号：TU458[建筑科学—岩土工程]