基于流固耦合理论的隧道涌水量预测

涌水量是富水位隧道设计和施工的一个重要参数.结合大伙房水库输水工程的实际地勘资料,建立与实际相符合的三维涌水量数值模型,运用流固耦合理论对该工程进行数值模拟分析.同时,利用FLAC3D内置的FISH函数编程计算出了15+720~15+797工程段的最大涌水量和经常涌水量.计算结果表明:断层带施工前方水流流速较大,易发生涌水灾害;预测出的涌水量与现场实测值比较吻合,具有很好的参考价值.因此,施工过程中要加强前方地下水的探测,及时采取注浆止水措施,以防涌水事故的发生.

Using Coupled Fluid-Solid Theory to Forecast Tunnel Water Inflow

Water inflow is a key parameter in the design and construction of tunnels having excess water. According to survey information from the Dahuofang water conveyance project, a three-dimensional numerical model was constructed to simulate actual conditions, and coupled fluid-solid theory was used for analysis. At the same time, FISH function in FLAC3D was utilized to calculate the maximum water inflow and normal water inflow between sections 15+720 and 15+797. Flow velocity and potential for water-related calamity was greater in the frontage of the fault construction. Forecasted water inflow was correlated well with actual survey values. Therefore, it was recommended that during the construction process detection of frontage groundwater could be strengthened along with the timely use of grout to plug excess water flow.