深埋长大引水隧洞三维物理模型渗透性试验研究

 地质力学物理模型试验是研究地下工程问题的主要方法之一。结合锦屏二级水电站引水隧洞工程，对高渗透压下深埋引水隧洞进行施工过程的物理模拟，设计制作水压自动控制供水系统，离散式花管渗流生成系统，实现渗流场的高度仿真模拟。对动态施工过程中引水隧洞围岩内部的渗流及演化规律进行计算分析，实体模型内特征点的渗透压力计算值、实测值比照结果证明模型渗流试验系统的科学性和合理性。试验结论为引水隧洞的防渗施工技术设计提供理论依据，并对引水隧洞的长期稳定性、安全性评价和预测具有重要意义。

STUDY ON 3D PHYSICAL MODEL TEST OF SEEPAGE OF DEEP-BURIED LONG AND LARGE DIVERSION TUNNEL

Geomechanical physical model test is one of the main methods to solve underground engineering problems. Based on the diversion tunnel project of Jinping II Hydropower Station，physical simulation of the construction process of deep-buried long and large diversion tunnel under high seepage pressure is conducted. The hydraulic serve-controlled water supply system and discrete holey tube seepage generation system are designed and made to realize the high simulation of seepage field. Calculation analyses of the seepage and evolution law inside the surrounding rocks of diversion tunnels during dynamic construction process are conducted. The scientific rationality of the model seepage test system is proved by the comparison of the calculated and measured results of osmotic pressure of characteristic points inside the solid model. According to experimental results，the theoretical basis for the anti-seepage construction technology design of diversion tunnels is provided；and it is of great significance for the long-term stability，safety evaluation and prediction of diversion tunnels.