岩石(体)破坏广义统一强度理论  

Research on generalized unified strength theory of rock (mass) failure

作　　者：郭建强[1] 杨前冬 卢雪峰 陈建行 蒋建国 蒋磊 伍安杰 GUO Jianqiang;YANG Qiandong;LU Xuefeng;CHEN Jianhang;JIANG Jianguo;JIANG Lei;WU Anjie(College of Civil Engineering,Guizhou University,Guiyang 550025,China;Guizhou Geological and Mineral Foundation Engineering Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550025 [2]贵州地矿基础工程有限公司,贵州贵阳550081

出　　处：《煤炭学报》2021年第12期3869-3882,共14页Journal of China Coal Society

基　　金：国家科技支撑计划资助项目(2012BAK05B00);国家自然科学基金资助项目(41372356)。

摘　　要：强度理论是深部空间利用及灾害防控的基础,鉴于深地空间的"三高"赋存环境及传统强度理论在深部岩体稳定性适用性方面存在着较大不足,迫切需要建立适应于深部岩体的强度理论。基于能量转化是物质物理过程的本质属性,从可释放应变能角度分析了已有扩容准则、强度准则及岩爆判据的物理涵义及其不足之处,借鉴由强度数据最佳拟合得到的经验性强度准则,通过引入变形参数建立了能体现深部岩体应变能高度积聚、岩体完整性、岩体弹性模量、震源释放应变能及支护结构抵抗能的半理论半经验的广义统一强度理论,针对深部岩体中扩容、屈服或破坏、弱岩爆、中等岩爆及高岩爆活动5个级别,提出4个分级界限值(0.9,1.0,1.2和1.9)。广义统一强度理论首次实现了以下3个方面统一:广义统一强度理论所表征物理涵义与岩体扩容、屈服或破坏及岩爆发生的内在机理的统一;实现了扩容准则、强度准则与岩爆判据表达式的统一,便于深部岩体数值模拟计算;将震源释放应变能与支护结构抵抗能统一于同一个表达式,实现了地震与非地震条件下深部岩体稳定性计算公式的统一,并从理论上得出地下工程震害较小的内在原因。利用已有的岩爆经典模型与广义统一强度理论,对国内外经典扩容应力、真三轴强度及一些重大深部岩石工程岩爆情况进行了预测,结果表明广义统一强度理论与实际情况吻合得较好。Strength theory is the foundation of deep space utilization and disaster prevention and control. Nevertheless, because of the initial property of the ‘three high’ occurrence environment of the deep earth, it is necessary to establish strength theory, which is different from the classical strength theories, and describe the disasters with high energy level frequently occur in deep rock body. Compared with the traditional model, a generalized unified strength theory was proposed considering the intrinsic relations between energy conversion and substance physical process. The geological parameters including rock integrity designation, elasticity modulus, and earthquake energy release level and resistance strain energy of the supporting and protecting system were adopted to establish the model. In terms of five grades of deep rock mass movement, i.e., dilation, failure, and weak, moderate, intense rockbursts, four boundary values were presented as 0.9,1.0,1.2 and 1.9. The generalized unified strength theory(GUST) is realized to achieve a unification in three areas: dilation criterion, strength criterion and rockburst criterion. The GUST was used to verify the Byerlee theory and the good agreements were obtained. The problems of deep ground dilation and time, rockburst and time were solved. The effect of the release strain energy of earthquake and resistance energy of supporting system was studied in terms of dilation, failure and rockburst of deep ground, and the design and calculation of deep ground with resistance strain energy of the supporting and protecting system were proposed.

关 键 词：深部岩体 可释放应变能 抵抗能 统一强度理论 

分 类 号：TU45[建筑科学—岩土工程]