结构性黏土边界面模型在FLAC3D中的开发及隧道施工数值模拟

doi:10.13722/j.cnki.jrme.2020.0030

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摘要基于FLAC3D提供的本构模型二次开发平台，采用C++语言编写了各向异性结构黏土模型(anisotropic structured clay model，ASCM)，通过上海结构性黏土K0固结三轴不排水剪切试验模拟验证模型的合理性，并进行隧道施工地层损失数值模拟，在此基础上分析黏土结构性和胶结吸力对地表沉降的影响。研究结果表明：自定义ASCM本构模型能够进行三维隧道数值模拟，计算的隧道施工地表沉降结果与离心模型试验实测结果吻合较好；当隧道间距为1.5D时，地表最大沉降位于双圆隧道对称面位置，沉降曲线表现为单峰值“V”型，隧道间距为3.0D和4.5D时，地表最大沉降位于隧道轴线位置，沉降曲线表现为双峰值“W”型；黏土结构性对隧道施工地层损失扰动下地表变形形状影响不大，但结构破坏引起隧道轴线位置地表沉降显著增加，黏土胶结吸力则对隧道施工地层损失扰动下地表变形大小和形状影响不大。

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	柳军修1
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	尹振宇3
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	朱姝4

关键词 ：隧道工程, 结构性, 黏土, 二次开发, 边界面模型

Abstract：According to the secondary development platform provided by FLAC3D，the anisotropic structured clay model(ASCM) is implemented using the coding language of C++. The model is first verified by simulating the undrained triaxial tests on K0 consolidated Shanghai clay. Numerical simulation of ground loss during tunnel construction is then performed，and the influences of clay structure and adhesive stress on ground surface settlement are analysed. The results show that the user-defined ASCM constitutive model can be used for numerical simulation of 3D tunnels and that the calculated ground surface settlement curves due to tunnel construction agree well with measurements of the centrifugal model tests. The profiles of the ground settlement curve like a “V” with the peak point located near the centre of the two tunnels with a spacing of 1.5D. With increasing the spacing distance of twin-tunnel，the settlement curve shape changes from “V” to “W” with two peak points located above the tunnel axis. Finally，the influence of clay structure on tunnel construction is numerically analysed. It is shown that the influence of clay structure on the ground deformation shape under the disturbance of ground loss in tunnel construction is not significant while that the ground settlement at the tunnel axis increases significantly due to structural deterioration. The influence of the clay adhesive stress on the ground settlement and deformation shape under the disturbance of ground loss in tunnel construction is not significant.

Key words： tunnelling engineering soil structure clay secondary development bounding surface model

引用本文:

柳军修1，2，尹振宇3，杨杰3，朱姝4. 结构性黏土边界面模型在FLAC3D中的开发及隧道施工数值模拟[J]. 岩石力学与工程学报, 2020, 39(6): 1277-1286.
LIU Junxiu1，2，YIN Zhenyu3，YANG Jie3，ZHU Shu4. Implementation of a bounding surface model of structured clays in FLAC3D and numerical simulation of tunnel construction#br#. , 2020, 39(6): 1277-1286.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0030 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I6/1277

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