地下电站顶拱裂缝的近景摄影监测

Close-shot Photographic Monitoring of Cracking in Arch of Underground Power Station

四川映秀电厂的渔子溪地下电站厂房从衬砌施工以来,陆续发现几百条裂缝。在电站运行的几年中,其裂缝不断扩展、增多。对此曾用位移计、钢筋应力计、裂缝宽度计等测量围岩地应力和衬砌裂缝的状况,有利于了解围岩和衬砌初期的工作情况,但对于长期和全面的监测还有困难。采用近景摄影量测方法,可进行全区域和裂缝尖端的摄影量测,能得到裂缝分布和裂缝扩展状况的图像,以及了解裂缝扩展速度和变化,有利于分析地下洞室衬砌的稳定程度。

In Yuzixi underground power station (Yinxiu, Sichuan Province) there have been several hundred cracks found since the lining construction. During the operation of the station, the cracks developed and their number increased. For ascertaining the state of enclosing rock and lining during their initial period of work, the crustal stress of enclosing rock and crack of lining were measured by displacement meter, reinforcement meter and crack width meter. But it is difficult for longterm observation. By means of close-shot photography, the cracks in whole area and tips of cracks could be observed photographically, The images of distribution of cracks and propagation of cracks could be gained for ascertaining the crack propagation rate and its variation. This is beneficial for analysing stability of lining in undergrounnd tunnel.