遍布节理模型在层状岩体模拟中的适用性研究  

Applicability of Ubiquitous-Joint Model in Layered Rocks Simulation

作　　者：黄娟[1] 周世杰 贾朝军 宋银涛 张建 HUANG Juan;ZHOU Shijie;JIA Chaojun;SONG Yintao;ZHANG Jian(School of Civil Engineering,Central South University,Changsha 410075,China;China Railway No.5 Engineering Group Co.,Ltd.,Hengyang 420002,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中铁五局集团有限公司,湖南衡阳420002

出　　处：《湖南大学学报（自然科学版）》2023年第9期131-141,共11页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(U1934211)。

摘　　要：为弥补遍布节理模型未考虑节理长度、间距及节理刚度的不足,利用三轴压缩数值试验和参数校准准则,对有限差分软件FLAC3D中的遍布节理模型进行参数校准.通过圆形洞室开挖的算例,对比分析了遍布节理模型与3DEC块体离散元模型的计算结果在位移、塑性区以及最大主应力上的差异.依托具有典型层状围岩的新华山隧道工程,采用校准的遍布节理模型和离散元方法分析隧道开挖和初期支护后的力学响应.最后探讨了层理角度对围岩变形和塑性区的影响,进一步验证校准后的遍布节理模型在工程中的适用性.研究表明,经过校准的遍布节理模型能够较好地描述层状岩体的各向异性行为,可应用于类似工程之中.To address the limitations of the Ubiquitous-Joint model which does not consider the effects of joint length,joint spacing,and joint stiffness,the parameters of the Ubiquitous-Joint model in FLAC3D were calibrated using triaxial compression numerical tests and parameter calibration criteria.The distinctions of modeling results between the Ubiquitous-Joint model and the 3DEC model including the deformation,the plasticity zone,and the maximum principle stress were compared and analyzed by an example of circular tunnel excavation.Based on the Xinhua Mountain Tunnel project with typical layered rock mass,the deformation and failure mode were analyzed with the calibrated Subiquitous model and discrete element method after the tunnel was excavated and primary support finished.Finally,the deformation and plastic zone of surrounding rock influenced by bedding angle was discussed,which further verified the applicability of the calibrated Subiquitous model in engineering.The results confirm that the calibrated Subiquitous model is capable to well describe the anisotropic behavior of layered rock,which can be applied to similar engineering projects.

关 键 词：岩石力学 各向异性 遍布节理模型 隧道开挖 

分 类 号：TU45[建筑科学—岩土工程]