ISSN 1000-3665 CN 11-2202/P
    刘琛尧, 晏启祥, 孙润方, 王绪, 邓宝华, 陈耀. 基于三维离散-连续耦合的岩溶隧道突水破坏模式研究[J]. 水文地质工程地质. DOI: 10.16030/j.cnki.issn.1000-3665.202211045
    引用本文: 刘琛尧, 晏启祥, 孙润方, 王绪, 邓宝华, 陈耀. 基于三维离散-连续耦合的岩溶隧道突水破坏模式研究[J]. 水文地质工程地质. DOI: 10.16030/j.cnki.issn.1000-3665.202211045
    LIU Chenyao, YAN Qixiang, SUN Runfang, WANG Xu, DENG Baohua, CHEN Yao. Study on water inrush failure mode of karst tunnel based on three-dimensional discrete-continuous coupling[J]. Hydrogeology & Engineering Geology. DOI: 10.16030/j.cnki.issn.1000-3665.202211045
    Citation: LIU Chenyao, YAN Qixiang, SUN Runfang, WANG Xu, DENG Baohua, CHEN Yao. Study on water inrush failure mode of karst tunnel based on three-dimensional discrete-continuous coupling[J]. Hydrogeology & Engineering Geology. DOI: 10.16030/j.cnki.issn.1000-3665.202211045

    基于三维离散-连续耦合的岩溶隧道突水破坏模式研究

    Study on water inrush failure mode of karst tunnel based on three-dimensional discrete-continuous coupling

    • 摘要: 岩溶隧道在修建的过程中难以避免接近溶腔甚至高承压水溶腔,而突水破坏极易引发安全事故甚至对隧道产生不可逆的影响,因此对破坏模式的研究有利于解决岩溶隧道相关安全问题以及对选线安全具有一定参照意义。本文通过三维离散-连续耦合数值技术,对微观离散颗粒物理、力学参数进行标定并验证,模拟了在水压作用下下伏溶腔与隧道仰拱之间的防突岩体垮塌重要过程。根据实验结果将防突岩体的破坏模式分为三类:剪切破坏模式、弯折破坏模式和复合破坏模式。弯折破坏模式表现为防突岩体中部和两端拉伸裂缝呈贯通状;剪切破坏模式表现为防突岩体两端裂缝呈剪切态;复合破坏模式则同时具有二者的共同特性。三种破坏模式所引起的裂缝发育规律相似,均可分为三阶段:初始发育、快速发育和平缓发育三个阶段。初始发育阶段时防突岩体所存在的裂缝数量较少;维持水压力防突岩体的裂缝数量突增并进入快速发育阶段;而后防突岩体中的裂缝产生贯通效果进入平缓发育阶段,最终防突岩体整体垮塌。由此得出结论:突水破坏在岩溶隧道中是一个渐变的过程,但对岩溶隧道总体安全性有不可逆的影响。

       

      Abstract: During the construction of karst tunnel, it is difficult to avoid approaching the cavern, even high pressure water cavern. Water inrush damage very easily causes safety accidents and would have irreversible impact on the tunnel. The study on damage mode is conducive to solving problems related to karst tunnel safety and has certain significance for the safety of route selection. In this study, the physical and mechanical parameters of micro-discrete particles are calibrated and verified by a three-dimensional discrete-continuous coupling numerical technology, and the important process of rock-burst collapse prevention between the underlying solution cavity and the tunnel invert under water pressure is simulated. The results show that the failure modes of outburst prevention rock mass are divided into three types: shear failure mode, bending failure mode, and composite failure mode. The bending failure mode indicates that the tensile cracks in the middle and both ends of the outburst prevention rock mass are in the form of penetration; the shear failure mode shows that the cracks at both ends of the outburst prevention rock mass are in the shear state; while the composite failure mode has the common characteristics of both. The fracture development rules caused by the three failure modes are similar and can be divided into three stages: initial development, rapid development, and gentle development. At the stage of initial development, the number of cracks in the rock body is small; the number of cracks in the rock mass maintaining water pressure and preventing outburst suddenly increases and enters the stage of rapid development; after that, the crack in the outburst prevention rock mass connect and then enter the stage of gentle development, ultimately, leading to the overall collapse of the outburst prevention rock mass. Thus, this study indicates that water inrush damage is a gradual process in karst tunnels, but it has an irreversible impact on the overall safety of karst tunnels.

       

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