库区爆破对高坡岭水库大坝影响监测分析

Monitoring Analysis on Impact of Blasting in Gaopoling reservoir area on dam

高坡岭水库大坝是一座建于强透水性砂砾石层上以砂土填筑的土坝。华能海南东方电厂一期新建工程(2×350 MW)厂外补给水泵房建于高坡岭水库左坝端上游约120 m处,采用爆破施工。为保证工程安全,建立了高坡岭水库大坝现场安全监测系统,在爆破施工期间进行实时监测。爆破施工期为54 d,其间的人工巡视未发现大坝有明显的异常变形和渗流现象;监测结果表明大坝变形量和坝基渗流压力变化量均极小。由此可判断库区爆破施工未对大坝造成危害,单孔爆破装药量30 kg以内的爆破施工方案是合适的。

The Gaopoling Reservoir Earth-filling Dam was built on the strong seeping sand and gravel with ex- tremely seepage. The supply pumping plant of Huaneng Power Plant first new project （2 ×350 MW） in Hainan Province Dongfang City will be built at about 120 m above the left side of the dam and the engineering construction make use of blasting. In order to ensure the safety of the project, the safety monitoring system at Gaopoling Reservoir Dam site was set up for the real-time monitoring during the period of the construction blasting. During the period of 54 days, the results of the artificial inspection indicated that there was no significantly abnormal phenomenon of dam deformation and seepage to be found; monitoring results showed that the changes of dam deformation and dam foundation seepage pressure were very small. It could be judged that the blasting construction in the reservoir area does not cause dam damage, and the program of the construction blasting controlled by the single hole charge volume within 30 kg is appropriate.