裂隙岩体中隧道变形破坏的节理有限元模拟计算
发布时间：2019-08-02 17:55
【摘要】：裂隙岩体是地下工程施工中经常遇到的一类岩体,研究其变形和破坏机理是工程安全施工的保证。以天平线关山隧道工程为例,采用基于修正Goodman单元的节理网络有限元法,将裂隙岩体看作由岩块和节理、裂隙组成的二元结构,其中岩块和节理、裂隙分别采用线性Mohr-Coulomb强度准则和非线性Barton-Bandis剪切强度准则。通过有限元软件Phase~2模拟分析了隧道开挖过程中裂隙岩体的变形破坏特点以及不同工况下隧道拱顶的沉降量,并讨论了Barton-Bandis准则中节理粗糙程度(J_(RC))的取值对围岩稳定性的影响。研究方法为裂隙岩体的数值计算提供了新手段,节理粗糙度(J_(RC))的反演结果能为支护设计和加固措施提供参考依据。
[Abstract]:Fracture rock mass is a kind of rock mass often encountered in underground engineering construction, and the study of its deformation and failure mechanism is the guarantee of engineering safety construction. Taking Guanshan Tunnel Project of Tianping Line as an example, the joint network finite element method based on modified Goodman element is adopted to regard the fracture rock mass as a binary structure composed of rock block, joint and fracture, in which the linear Mohr-Coulomb strength criterion and nonlinear Barton-Bandis shear strength criterion are adopted for rock block and joint and fracture, respectively. The deformation and failure characteristics of cracked rock mass during tunnel excavation and the settlement of tunnel arch roof under different working conditions are simulated and analyzed by finite element software Phase~2, and the influence of joint roughness (J _ (RC) in Barton-Bandis criterion on the stability of surrounding rock is discussed. The research method provides a new method for the numerical calculation of fracture rock mass, and the inversion results of joint roughness (J _ (RC) can provide a reference for support design and reinforcement measures.
【作者单位】： 太原理工大学矿业工程学院;
【基金】：山西省回国留学人员科研项目(2013-050) 2012年高等学校博士学科点专项科研基金(20121402110013)资助
【分类号】：U452
[Abstract]:Fracture rock mass is a kind of rock mass often encountered in underground engineering construction, and the study of its deformation and failure mechanism is the guarantee of engineering safety construction. Taking Guanshan Tunnel Project of Tianping Line as an example, the joint network finite element method based on modified Goodman element is adopted to regard the fracture rock mass as a binary structure composed of rock block, joint and fracture, in which the linear Mohr-Coulomb strength criterion and nonlinear Barton-Bandis shear strength criterion are adopted for rock block and joint and fracture, respectively. The deformation and failure characteristics of cracked rock mass during tunnel excavation and the settlement of tunnel arch roof under different working conditions are simulated and analyzed by finite element software Phase~2, and the influence of joint roughness (J _ (RC) in Barton-Bandis criterion on the stability of surrounding rock is discussed. The research method provides a new method for the numerical calculation of fracture rock mass, and the inversion results of joint roughness (J _ (RC) can provide a reference for support design and reinforcement measures.
【作者单位】： 太原理工大学矿业工程学院;
【基金】：山西省回国留学人员科研项目(2013-050) 2012年高等学校博士学科点专项科研基金(20121402110013)资助
【分类号】：U452
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