岩溶隧道承压隐伏溶洞突水模型试验与数值分析  

Model tests and numerical analysis for water inrush caused by karst caves filled with confined water in tunnels

作　　者：潘东东 李术才[1] 许振浩[1] 李利平[1] 路为[1,2] 林鹏[1] 黄鑫 孙尚渠 高成路 PAN Dong-dong;LI Shu-cai;XU Zhen-hao;LI Li-ping;LU Wei;LIN Peng;HUANG Xin;SUN Shang-qu;GAO Cheng-lu(Geotechnical and Structural Engineering Research Center, Shandong University, Ji＇nan 250061, China;Research Institute of Highway, Ministry of Transport, Beijing 100088, China)

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061 [2]交通部公路科学研究院,北京100088

出　　处：《岩土工程学报》2018年第5期828-836,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金青年基金项目(51509147);国家重点基础研究发展计划(“973”计划)项目(2013CB036000);山东大学基本科研业务费资助项目(2017JC002)

摘　　要：为研究不同充填水压条件下隐伏溶洞对隧道围岩稳定性的影响,进而揭示溶洞突水致灾机理,利用自主研发的大型三维流固耦合模型试验系统,针对强充填滞后型溶洞突水孕灾模式开展了试验研究,揭示了承压溶洞突水过程位移、应力及渗压的变化规律,综合模型试验与数值计算各自的优势,开展了不同充填水压下（0.4-1.1 MPa）隧道开挖过程流固耦合数值模拟,对模型试验结果进行补充验证。研究结果表明：溶洞影响范围主要集中于一倍洞径范围内,受溶洞影响普通围岩的应力水平及应力释放量均高于隔水岩体,孔隙水压力消散速度较大,位移变化相对平稳;在隧道开挖阶段,随着溶洞充填水压增大,隔水岩体应力释放率越低,渗透压力整体升高,上升梯度逐渐减小,当溶洞水压高于0.8 MPa时,位移出现明显异常;模型试验水压加载阶段真实再现了隔水岩体破裂突涌水过程,研究结果对于岩溶隧道施工过程突水灾害防控具有指导意义。To study the stability of the surrounding rock of concealed karst caves under different filling water pressures and to reveal the water inrush mechanism, a self-developed new type of model test system is applied to the solid-fluid coupling model tests on lagging water-inrush of karst cave, and the variation of the multi-field information such as displacement, stress and seepage pressure is effectively revealed. The advantages of numerical analysis are used to carry out fluid-solid coupling numerical simulation of tunnel excavation process under different filling water pressures（0.4 to 1.1 MPa）. Based on the results of model tests and numerical simulations, the karst cave has impact on the surrounding rock within the scope of one time the cave diameter. The stress level, stress release rate and dissipation rate of pore water pressure of the ordinary surrounding rock are higher than those of water-resisting rock mass. Among them, the displacement exhibits an obvious stable stage. In the course of excavation, the rate of stress relieving gradually decreases when the filling pressure increases. Moreover, the osmotic pressure increases as a whole, but the gradient decreases. Nevertheless, after the karst water pressure reaches 0.8 MPa, obvious change starts to appear. The process of water inrush is truly reproduced at the hydraulic loading stage. The test results are used to guide the design and construction of the similar projects.

关 键 词：强充填溶洞 流固耦合 模型试验 多元信息 数值分析 

分 类 号：TU43[建筑科学—岩土工程]