隧道水压充填型溶洞突水破坏模式与灾变演化机理研究

发布时间：2018-05-26 18:22

本文选题：隧道 + 充水溶洞　；参考：《山东大学》2017年硕士论文

【摘要】：岩溶地区地质赋存条件复杂,隧道施工难度大,隧道施工常会遇到涌水、突泥等地质灾害,严重威胁施工安全。本文以重庆歇马隧道为依托工程,通过室内试验、模型试验、数值模拟等手段,对溶洞突涌水破坏模式及致灾演化机理进行深入的研究,主要内容如下:(1)研制了溶洞突水模拟室内试验系统,该试验系统具有系列化、可视化、多类型等特点,且试验周期短、方便简洁,适宜进行旨在研究宏观规律的大样本统计试验。开展了溶洞突水模拟室内试验,模拟了隧道拱顶、拱底、掌子面前方溶洞突水过程,总结了溶洞突水过程中隔水岩体破坏模式,综合分析了溶洞突水及隔水岩体处裂隙萌生,演化贯通、突水通道形成直至发生突水的整个过程。(2)研制了高地应力—高渗压模型试验系统,该系统主要由试验台架、地应力加载系统、水压加载系统、控制系统、多元信息监测系统、高清视频监测系统组成,该系统具有承载力高、可拓展性强、可视化程度高、自动化程度高等特点。从重庆歇马隧道工程现场采取灰岩岩样,通过单轴压缩试验、巴西劈裂试验、三轴压缩试验等室内试验,研究岩溶区灰岩力学性质。开展了隧道施工诱发溶洞突水致灾过程模型试验,分析隧道开挖过程中充水溶洞对隧道围岩稳定性的影响以及隧道突涌水过程中多物理场信息变化规律,揭示了隧道施工诱发溶洞突涌水致灾机理。(3)采用FLAC3D数值软件,构建三维数值模型,对隧道前方存在上覆高压充水溶洞施工进行模拟,分析隧道开挖过程中隧道围岩位移场、应力场、渗流场变化规律,研究高压充水溶洞对隧道围岩稳定性的影响。
[Abstract]:The geological conditions in karst area are complicated and the tunnel construction is difficult. The tunnel construction is often met with geological disasters such as water gushing and mud outburst which seriously threaten the construction safety. In this paper, by means of laboratory test, model test, numerical simulation and so on, the failure mode of water gushing and the mechanism of disaster-induced evolution of karst caverns are deeply studied based on the Chongqing Xiangma Tunnel. The main contents are as follows: (1) A water inrush simulation laboratory test system for karst caves has been developed. The system is characterized by serialization, visualization, multi-type, short test period, convenience and simplicity. It is suitable for large sample statistical test to study macroscopic law. In this paper, the water inrush simulation laboratory test of karst cave is carried out, and the water inrush process of the tunnel arch top, arch bottom and front face of the tunnel is simulated. The failure mode of water barrier rock mass during the water inrush process of the cave is summarized, and the water inrush of the cave and the crack initiation at the water-proof rock mass are analyzed synthetically. The model test system of high in-situ stress-high permeability pressure is developed. The system is mainly composed of test bed, in-situ stress loading system, hydraulic pressure loading system, control system, etc. The multi-information monitoring system is composed of high-definition video monitoring system. The system has the characteristics of high bearing capacity, high expansibility, high visualization and high automation. Taking limestone samples from the site of Chongqing Shema Tunnel Project, the mechanical properties of limestone in karst area were studied by laboratory tests such as uniaxial compression test, Brazilian splitting test and triaxial compression test. The model test on the process of water inrush induced by tunnel construction is carried out, and the influence of water-filled karst cave on the stability of tunnel surrounding rock during tunnel excavation is analyzed, as well as the variation law of multi-physical field information in the process of tunnel water inrush. In this paper, the mechanism of water inrush induced by tunnel construction is revealed. The 3D numerical model is constructed by using FLAC3D numerical software, and the construction of overlying high pressure water-filled karst tunnel in front of tunnel is simulated, and the displacement field of surrounding rock during tunnel excavation is analyzed. The influence of high pressure water-filled cavern on the stability of tunnel surrounding rock is studied.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U456.3

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