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利用虚拟热源法研究坝基裂隙岩体中存在的集中渗漏通道。水库底部通常为低温水,而基岩温度随着深度的增加而升高,坝后温度异常区域可能存在库水渗漏。渗漏水与周围地层将进行热量的交换。低温的渗漏水从地层中吸收热量,而地层则释放出热量,根据能量守恒原理,这两个热量是相等的。将集中渗漏通道看作是一个虚拟线热源,通道以外地层温度的分布仅与渗漏带最外层的温度有关,与渗漏通道内部的温度分布无关,渗漏通道内部的温度是由水流带来的,其外部的温度是靠热传导进行。根据热传导及能量守恒理论,可以推导出温度在地层中的分布趋势,通过温度分布曲线可以确定渗漏范围,建立堤坝渗漏量的虚拟热源法模型;同时,对具体工程实例进行了定量计算。
Study on the Central Leakage Channel Existing in the Dam Foundation Rock Mass Using Virtual Heat Source Method. The bottom of the reservoir is usually low-temperature water, while the bedrock temperature increases with depth, and there may be reservoir water leakage in the anomalous area behind the dam. Leakage and the surrounding strata will be exchanged for heat. Low-temperature seepage water absorbs heat from the formation, while the formation releases heat, which is equal according to the conservation of energy. The central leakage channel is regarded as a virtual line heat source. The distribution of temperature outside the channel is only related to the temperature of the outermost layer of the leakage zone, and is independent of the temperature distribution inside the leakage channel. The temperature inside the leakage channel is determined by the water flow Brought about by its external temperature is conducted by heat conduction. According to the theory of heat conduction and energy conservation, the distribution trend of temperature in the formation can be deduced. Through the temperature distribution curve, the leakage range can be determined and the virtual heat source model of leakage of dyke can be established. Meanwhile, the specific engineering examples are quantitatively calculated.