基于岩体断裂能比值的脆性指标分析  

Analysis of Brittleness Index Based on Fracture Energy Ratio of Rock Mass

作　　者：龚诚鑫 张连英[1] 马超[1] 田竹华 GONG Chengxin;ZHANG Lianying;MA Chao;TIAN Zhuhua(Xuzhou University of Technology,Xuzhou,Jiangsu 221018,China;China University of Mining and Technology,State Key Laboratory for Geomechanics&DeepUnderground Engineering,Xuzhou,Jiangsu 221000,China;School of Civil Engineering andArchitecture,Anhui University of Science and Technology,Huainan,Anhui 232001,China)

机构地区：[1]徐州工程学院,江苏徐州市221018 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州市221000 [3]安徽理工大学土木建筑学院,安徽淮南市232001

出　　处：《矿业研究与开发》2022年第2期82-89,共8页Mining Research and Development

基　　金：江苏省高校自然科学研究重大项目(17KJA560004);徐州市重点研发计划项目(KC18090);徐州市创新能力建设计划项目(KC18241);江苏省住房和城乡建设厅科技计划项目(2018JH023).

摘　　要：脆性是岩石极为重要的一种固有属性,是评价岩爆发生概率和岩体力学属性的重要指标,但至今还没有标准的、统一的岩石脆性定义及测试方法。因此,在简化的应力-应变曲线基础上,提出一种考虑岩体峰后断裂能与峰前断裂能比值的新的脆性指标。为验证新指标的准确性,对3种不同岩性岩石开展了单轴和三轴压缩试验。研究结果发现:花岗岩、红砂岩和泥质砂岩在所受应力状态相同的情况下,脆性程度依次减小,与实际脆性程度相符;经由理论和试验结果分析,验证了该脆性指标的正确性,能够为深部岩体开发利用中的地层脆性评价提供参考。Brittleness is an extremely important inherent property of rock,as well as an important indicator for evaluating the probability of rockburst and the mechanical properties of rock mass.However,there is no standard and unified definition and testing method for rock brittleness.Therefore,based on the simplified stress-strain curve,a new brittleness index considering the ratio of post-peak fracture energy to pre-peak fracture energy of rock mass was proposed.To verify the accuracy of the new index,uniaxial and triaxial compression tests were carried out on three different lithologic rocks.The research results show that the brittleness degree of granite,red sandstone and argillaceous sandstone decreases in turn under the same stress state,which is consistent with the actual brittleness degree.The correctness of the brittleness index was verified through the analysis of theoretical and experimental results,which can provide a reference for stratum brittleness evaluation in the development and utilization of deep rock mass.

关 键 词：岩体力学 脆性指标 应力-应变曲线 峰前断裂能 峰后断裂能 

分 类 号：TD313[矿业工程—矿井建设]