基于面状渗漏热源模型研究西藏江雄水库渗漏

Groundwater leakage of Jiangxiong Reservoir in Tibet based on plane-leakage heat source model

根据江雄水库的坝区地质构造和工程地质状况,通过坝后探测沟的探测结果,发现江雄水库的渗水具有不同的来源,渗漏分布较广。在此基础上,结合钻孔温度探测和地层状况对0+615—0+655段典型渗漏部位进行分析,认为该段渗漏为面状渗漏。研究面状渗漏产生的温度场分布,认为面状渗漏可以看作渗漏平面内垂直于渗漏方向的线热源的叠加,并基于热传导理论和能量守恒原理,推导了面状渗漏热源模型公式。考虑到上述模型在实际应用中存在困难,通过一定的近似简化,提出了基于平面热源法的简化方法,建立了可供于工程应用的简化模型,为工程中复杂的渗漏问题提供了一种新的方法。模型对0+615—0+655段的面状渗漏进行了计算,并将计算结果运用于工程实际,取得了良好的效果,表明其计算结果是可靠的。对模型进行了讨论,分析其优点和局限,认为其能够应用于工程实际的面状渗漏问题的分析和研究,可为类似工程提供借鉴。

The leakage problem is very serious in Jiangxiong Reservoir, and the leakage occurs during its construction. With the lastest three times of grouting treatments, the water leakage is still large. According to the geological structure and engineering geology, the fact that the leakage water is from different parts is obtained considering the probing results of the detection ditch. In order to determine the leakage passages and water leakage amount, borehole temperature detection is used. Based on layer situation, the leakage position from 0＋615 to 0＋655 is considered to be plane leakage. The plane-leakage heat source can be treated as the superposition of line-leakage heat sources. Based on the theory of heat conduction and the energy conservation principle, a formula for the plane-leakage heat source model is established. Considering the difficulty of practical application, through a certain degree of approximation, a simplified method based on the plane heat source is proposed. It may provide a new method for complex leakage problems in engineering. The calculated results of leakage parameters of the leakage position from 0＋615 to 0＋655 agree with the measured values, indicating that the proposed model can be employed to analyze the plane leakage in engineering and that it may be useful for similar projects.