基于有限差分的岩体破裂非连续变形及水力弱化效应表征方法  

Representation of discontinuous deformation and hydraulic weakening effect of rock masses failure based on finite difference method

作　　者：陈云娟[1] 敬艺 贾润枝 王军[1] 杨卓 罗平利 CHEN Yunjuan;JING Yi;JIA Runzhi;WANG Jun;YANG Zhuo;LUO Pingli(Key Laboratory of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University),Ministry of Education,Jinan 250101,Shandong,China;School of Qilu Transportation,Shandong University,Jinan 250061,Shandong,China;China National Chemical Communications Construction Group Co.,Ltd.,Jinan 250102,China;Shandong Highway Engineering Technology Research Center Co.,Ltd.,Jinan 250102,Shandong,China)

机构地区：[1]山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室,山东济南250101 [2]山东大学齐鲁交通学院,山东济南250061 [3]中化学交通建设集团有限公司,山东济南250102 [4]山东省公路工程技术研究中心有限公司,山东济南250102

出　　处：《山东大学学报（工学版）》2023年第5期103-111,共9页Journal of Shandong University（Engineering Science）

基　　金：国家自然科学基金资助项目(42172310);山东省自然科学基金资助项目(ZR2022ME060);山东省青创科技支持计划资助项目(2019KJG015)。

摘　　要：针对有限差分方法在研究岩体非连续变形和水力弱化参数方面的弊端,将屈服状态的岩体单元设置为空单元,使其不再参与计算,实现非连续变形的表征特点。通过分析拟合得到岩体参数随水压增加的弱化关系,重新定义柔度张量,嵌入弱化参数,修正并开发了水力弱化本构模型、屈服函数以及流动法则。基于提出的改进方法,分析岩体压缩条件下的非连续表征特性、各阶段变形特性以及强度影响规律等,模拟结果与已有文献中试验结果吻合度较高,验证了方法的有效性。Aiming at the disadvantages of finite difference method in studying discontinuous deformation and hydraulic weakening parameters of rock mass,the characterization of discontinuous deformation was realized by setting the rock mass element in the yield state as"empty element"to make it no longer participate in the calculation,and the discontinuous characteristics such as translation,large deformation and shedding of elements was simulated.Through the analysis and fitting,the weakening relationship of rock mass parameters with the increase of water pressure was obtained,and the flexibility tensor was redefined,at the same time,the weakening parameters were embedded to modify and develop the hydraulic weakening constitutive model,yield function and flow law.Based on the proposed improved method,the discontinuous characteristics of rock mass,deformation characteristics at each stage and influence law of strength under compression were analyzed.The simulation results were in good agreement with experimental results in existing literature,which verified the effectiveness of this method.

关 键 词：有限差分 岩体破裂 非连续表征 水力弱化 本构开发 

分 类 号：TU452[建筑科学—岩土工程]