逆断层错动作用下隧道衬砌铰接设计参数研究

doi:10.13722/j.cnki.jrme.2017.1477

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摘要

以滇中引水工程香炉山隧洞穿越断层为工程背景，运用有限元方法计算断层错动作用下衬砌的轴向力学特性，发现断层错动对衬砌的影响集中在错动面两侧30 m。基于衬砌弯矩沿轴向的分布,初步确定“铰接设计”中节段长度及节段间柔性连接的宽度。通过正交试验研究衬砌节段长度、柔性连接宽度、柔性连接材料强度3种因素及水平对衬砌内力的影响，并采用极差分析得到“铰接设计”的最优水平组合。结果表明，“铰接设计”是一种有效的抗错断措施，通过自身变形有效吸收断层错动产生的位移，且能够大幅度减小衬砌沿轴向的内力值，弯矩、剪力、轴力的降幅均超过80%。综合比较了纤维塑性混凝土与高性能泡沫混凝土在强度及渗透性方面的优、缺点，认为纤维塑性混凝土具有一定弹性模量、抗渗性好、抗拉强度和韧性高，可作为柔性连接材料用于铰接设计，研究结果可为过断层隧洞设计提供一定参考价值。

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关键词 ：隧道工程, 断层错动, 衬砌内力, 铰接设计, 正交试验, 极差分析, 抗错断措施

Abstract：

Based on the fault crossing situation of Xianglu mountain tunnel of water diversion project in central Yunnan province，the axial mechanical response of the lining was calculated by FEM. It was found that the influence of the fault movement on the lining is concentrated on 30 m in each side of the fault plane. The segment length and the width of the flexible joints of the articulated design were determined tentatively based on the distribution of the bending moment along the axial direction. The orthogonal test was conducted to investigate the influencing degree of the main factors and their different levels on the internal force of lining. Finally，the optimal combination for articulated design was obtained by range analysis. The results showed that the articulated design is an effective measure to accommodate the displacement of fault dislocation by the deformation. Moreover，the internal force of lining can be significantly reduced. The maximum reduction of bending moment，shear force and axial force are over 80%. Aiming at flexible material，the advantages and disadvantages of fiber-plastic concrete and high-performance foam concrete in strength and permeability were compared. It was concluded that the fiber-plastic concrete with a certain elastic modulus，good impermeability and higher tensile strength can be used as a flexible material for articulated design. The general regularity of this paper can provide some reference for the design of tunneling across fault zone.

Key words： tunnelling engineering fault dislocation mechanical response articulated design orthogonal test range analysis fault resisting measure

引用本文:

赵坤1，2，陈卫忠1，3，赵武胜1，杨典森1，宋万鹏1，2. 逆断层错动作用下隧道衬砌铰接设计参数研究[J]. 岩石力学与工程学报, 2018, 37(S1): 3411-3421.
ZHAO Kun1，2，CHEN Weizhong1，3，ZHAO Wusheng1，YANG Diansen1，SONG Wanpeng1，2. Study on parameters of articulated design of tunnel lining under reverse fault dislocation. , 2018, 37(S1): 3411-3421.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1477 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS1/3411

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