| 某砂岩隧道在开挖过程中变形的数值模拟研究 |
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| 引用本文： | 言志信,史盛,江平,党冰,刘灿,徐甜.某砂岩隧道在开挖过程中变形的数值模拟研究[J].地震学刊,2013(6):631-636. |
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| 作者姓名： | 言志信 史盛 江平 党冰 刘灿 徐甜 |
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| 作者单位： | 兰州大学土木工程与力学学院、西部灾害与环境力学教育部重点实验室,兰州730000 |
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| 基金项目： | 高等学校博士学科点专项科研基金课题（20090211110016）、甘肃省建设科技攻关项目（JK2012-20）资助 |
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| 摘 要： | 以某砂岩隧道为背景，首先应用弹塑性理论对隧道开挖后围岩的变形屈服和拱顶及边墙的应力状态进行了分析，继而采用有限差分软件FLAC3D模拟了隧道开挖过程中围岩的位移及塑性变形情况。计算结果表明：该研究段隧道发生塑性屈服的临界深度为78．2m；当隧道开挖31m后，由于开挖卸荷作用使得原先储存在围岩内的大部分应力得以释放，此后困岩变形基本趋于稳定；该隧道在开挖过程中，边墙变形量最大，达到1．94mm，由于隧道在开挖过程中围岩的自稳作用，当开挖到一定时间后，围岩变形将趋于稳定；该隧道在开挖过程中，拱顶和底部以拉张破坏为主，边墙则产生剪切破坏。
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| 关 键 词： | 砂岩隧道 本构模型 开挖 围岩变形 数值模拟 |
Study on Numerical Simulation for Deformation of a Sandstone Tunnel during Excavation |
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| YAN Zhi-xin,SHI Sheng,JIANG Ping,DANG Bing,LIU Can,XU Tian.Study on Numerical Simulation for Deformation of a Sandstone Tunnel during Excavation[J].Journal of Seismology,2013(6):631-636. |
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| Authors: | YAN Zhi-xin SHI Sheng JIANG Ping DANG Bing LIU Can XU Tian |
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| Institution: | (School of Civil Engineering and Mechanics, Key Laboratory of Meehanies on Disaster and Environment in Western China of Ministry of Education, Lanzhou University, Lanzhou 730000, China) |
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| Abstract: | As a case study, based on a realistic tunnel, we use elastic-plastic method to calculate the deformation of tunnel after excavation. Using the three-dimensional fast Lagrange analysis of continua method we analyse the deformation of tunnel during excavation. The result shows that the critical depth of plastic yield is 78.2 m. When the excavation reaches 31 m in the tunnel, the stress of surrounding rock is released and tends to stability. The maximum deformation of tunnel is at the sidewall during excavation. It reached 1.94 ram. The deformation of surrounding rock tends to stability after excavation which holds some days. During the construction, the tunnel is in tensile failure state at the vault and bottom, but in shear failure state at the sidewall. The con- clusion in this paper can be referred to the design of sandstone tunnel. |
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| Keywords: | sandstone tunnel constitutive model excavation surrounding rock deformation nu-merical simulation |
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