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一、理论依据在地下厂房、半地下厂房、甚至地面厂房式的水电站中,往往采用高压输水隧洞代替外露式的输水钢管。因为那些电站具有良好的条件来利用输水隧洞周围的岩石承受一部分甚至绝大部分的内水压力,以减少压力输水管钢钣的用量。用钢筋混凝土襯砌的压力隧洞,当承受内水压力时,襯砌受拉而伸长,外半径增大,引起岩石与襯砌间的压应力,即岩石的弹性抗力。弹性抗力抵挡了一部分内水压力。当内水压力的强度达到一定数值时(此处内水压力指内水压力减去计算的地下水压力),
First, the theoretical basis In the underground power plant, semi-underground plant, and even ground-based plant hydropower station, often using high-pressure water tunnel instead of exposed water pipe. Because those stations have good conditions to use the rocks around the water tunnel to withstand some or even the most part of the internal water pressure to reduce the amount of pressure delivery pipe sheet metal. When the pressure tunnel with reinforced concrete lining is subjected to internal water pressure, the lining is stretched and stretched and the external radius increases, causing the compressive stress between the rock and the lining, that is, the elastic resistance of the rock. Resilience Resists some of the internal water pressure. When the intensity of the internal water pressure reaches a certain value (where the internal water pressure refers to the internal water pressure minus the calculated groundwater pressure)