西南山区隧道充填型断裂构造突水突泥灾变演化机制

This dissertation focuses on the trigger mechanism and the evolution process of the water and mud inrush caused by the construction disturbance in the filling fracture structure under the condition of high osmotic pressure and high ground stress, which is in connection with the problem of the potential risk of water and mud inrush in Southwest mountain tunnels of China. Based on the filling fracture structure which had been preliminarily disclosed at Caijiashan Tunnel of Water Diversion Project in Yunnan, micro and microscopic methods will be used to identify both the material composition and structure of fillings in the fracture structure. Then the physical model and numerical model of typical filling fracture structure will be built, as well as the different fracture structures with different filling conditions. These models are used to carry out the physical model experiment and numerical simulation on the seepage failure under the condition of high osmotic pressure and high ground stress, and to analyze the relevance between fracture structure, filling materials and some physical parameters, such as flow rate, mud amount, hydraulic conductivity and Reynolds. Moreover, the seepage trigger mechanism and seepage transformation law in the filling fracture structure under high osmotic pressure will be revealed. Finally, critical condition parameters and identification criterion for the formation of the mud and water inrush channel in the filling fracture structure will be proposed.

针对西南山区隧道充填型断裂构造潜在突水突泥灾害隐患，重点研究高渗透压力和高地应力条件下施工扰动诱发充填型断裂构造突水突泥的触发机制及其演化过程。课题拟以滇中引水工程蔡家山隧洞前期勘探所揭露的充填型断裂构造为工程背景，采用微、细观分析方法明确充填型断裂构造中充填物的物质成分及结构型式，在此基础上建立典型充填型断裂构造及不同充填条件下的断裂构造的物理模型和数值模型，进行典型充填型断裂构造及不同充填条件下的断裂构造在高渗压和高应力条件下的渗透破坏物理模型试验和数值模拟计算，分析充填型断裂构造渗透破坏过程中的涌水量、突泥量、渗透系数及雷诺数等物理量与裂隙结构、充填物的关联性，揭示充填型断裂构造高压渗流作用下的渗流触发机制及渗流转换规律，提出充填型断裂构造泥、水突涌通道形成的临界条件参数及识别判据。

针对西南山区隧道充填型断裂构造潜在突水突泥灾害隐患，重点研究高渗透压力和高地应力条件下施工扰动诱发充填型断裂构造突水突泥的触发机制及其演化过程。课题拟以滇中引水工程蔡家山隧洞前期勘探所揭露的充填型断裂构造为工程背景，采用微、细观分析方法明确充填型断裂构造中充填物的物质成分及结构型式，在此基础上建立典型充填型断裂构造及不同充填条件下的断裂构造的物理模型和数值模型，进行典型充填型断裂构造及不同充填条件下的断裂构造在高渗压和高应力条件下的渗透破坏物理模型试验和数值模拟计算，分析充填型断裂构造渗透破坏过程中的涌水量、突泥量、渗透系数及雷诺数等物理量与裂隙结构、充填物的关联性，揭示充填型断裂构造高压渗流作用下的渗流触发机制及渗流转换规律，提出充填型断裂构造泥、水突涌通道形成的临界条件参数及识别判据。