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陕西省汉中地区石门水库水电站的压力隧洞系由导流隧洞改建而成,承压水头为75m,于1976年1月正式投入运行。由于隧洞在大坝(拱坝)1号、2号坝段下部30m基岩处通过右坝肩,为了验证此处隧洞本身的稳定性和对坝肩岩体稳定性的影响程度,故设置了13个观测孔,组成地下水长期观测网。通过观测,1983年发现右坝肩地下水位变化异常,水位逐渐上升并超过了允许设计水位,构成了对右坝
The pressure tunnel of Shimen Reservoir Hydropower Station in Hanzhong area of Shaanxi Province was reconstructed by the diversion tunnel. The pressure head was 75m and was put into operation in January 1976. Since the tunnel passes the right abutment at the 30m bedrock at the lower part of the No. 1 and No. 2 dam sections of the dam (arch dam), in order to verify the stability of the tunnel itself and the degree of influence on the stability of the abutment rock mass, 13 observation holes, composed of groundwater long-term observation network. Through observation, in 1983 found abnormal changes in the groundwater level at the right abutment, the water level gradually increased and exceeded the allowable design of water level, constitute the right dam