强风化花岗岩弹塑性本构模型研究(Ⅱ):工程应用  

Study of elastoplastic constitutive model of strongly weathered granite Ⅱ:Engineering application

作　　者：陈卫忠[1,2] 曹俊杰[1] 于洪丹[1] 贾善坡[3] 陈培帅[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [2]山东大学岩土与结构工程中心,济南250061 [3]长江大学城市建设学院,湖北荆州434023

出　　处：《岩土力学》2011年第12期3541-3547,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金重大国际合作项目(No.50720135906);国家自然科学基金(No.40772184);交通运输部行业科技攻关项目资助

摘　　要：根据文献[1]优化反演得到隧址处强风化围岩应变硬化弹塑性本构模型的计算参数,通过数值仿真研究CRD法、双侧壁法和台阶法3种工法时围岩与支护结构的受力变形情况,结果表明,CRD法为最优工法。在此基础上,根据翔安隧道左线ZK8+257～ZK8+307段的现场实际施工情况,建立三维模型动态模拟隧道CRD法开挖支护全过程,并将计算的变形位移与现场实测数据进行对比分析。研究表明:提出的弹塑性硬化本构模型及其数值仿真技术可较好地反映强风化花岗岩隧道开挖过程中的变形和破坏规律。其研究成果可为衬砌结构设计以及国内同类型隧道的施工和衬砌支护技术设计提供可靠指导。According to reference [1],calculation parameters of strain-hardening elastoplastic model in the strongly weathered granite region are obtained by back analysis.The CRD method,double-side-drift method and bench method are used to study the deformation behavior of the surrounding rock and support structure by the numerical simulation respectively.It is shown that the CRD method is the best method for undersea tunnel excavation after comparing the results.On this basis,considering the in-situ situation of section ZK8＋257-ZK8 ＋307 of Xiamen undersea tunnel,a 3D numerical model is established to simulate the tunnel excavation process constructed by CRD method.Meanwhile,a comparative analysis between the calculation results and in-situ measurements is carried out.The results show that the numerical simulation technology as well as the strain-hardening elastoplastic model established here can well reflect the deformation behavior and damage rule of strongly weathered granite during Xiamen undersea tunnel excavation.The results can provide guidance for lining design,support technology and also tunnel construction for the same kind of tunnel construction.

关 键 词：海底隧道 本构模型 软弱围岩 施工方法 

分 类 号：O344.3[理学—固体力学]