基于热流耦合方法的岩体内渗水水温变化过程模拟

Simulation of Water Seepage Temperature Variation of Rock Mass Based on Heat-fluid Coupling Method

鉴于正确判断出水原因及渗水来源是制定防渗加固措施的重要依据,将热流耦合方法引入到岩体裂隙渗水计算中,分析渗水来源、渗水量、渗漏路径及岩体温度等对渗水温度的影响程度。结合某实际工程导流洞首次过流时在附近出现的10个渗水点,应用该方法模拟由导流洞到出水点的渗水过程。结果表明,6个出水点的温度仿真结果与实测水温接近,佐证了渗水来自导流洞的推断;2个距导流洞较近的出水点仿真温度偏高,极有可能是真实的渗漏路径较长所致;另有2个位置较远的点仿真温度偏低,初步推测可能受周边温度较低的地下水影响。这说明热流耦合方法可应用于模拟岩体裂隙中渗水水温变化过程,为初步判断岩体内渗水来源提供了依据。

Correct judgment of water outlet and seepage causes is an important criterion to formulate the seepage con trol measures. The heat-fluid coupling method is introduced to the calculation of water seepage in rock fracture and is used to analyze the impact of water source, discharge, leakage path and rock temperature on temperature of seepage. In a practical engineering, ten water leakage points were discovered after diversion tunnel filling water. The water temperature simulation results indicate that six of the ten are close to the measured values, further verifies the inference that water comes from the diversion tunnel. Two simulation water temperatures are higher than the measured values. The most possible reason is that the real leakage path is longer than the distance from diversion tunnel. Another two are lower than the measured temperatures, probably influenced by the near colder underground water. It was concluded that the heat-fluid coupling method could be applied to simulate temperature variation of water seepage in rock fracture, which provided reference for engineers to preliminary judge the seepage causes.