论文部分内容阅读
在我国,许多已建或在建的水电站地下洞群工程中经常发现洞室高边墙有陡倾角脆性劈裂带或大裂缝。为了探究大型地下厂房边墙裂缝带的分布情况、发育程度和形成原因,作者以瀑布沟工程地下厂房群为研究对象,在4号母线洞两侧的岩柱打了四个贯穿于主厂房与主变室的观测钻孔,采用钻孔电视成像仪和数字式全景钻孔摄像系统进行观测,得到主厂房下游边墙的裂缝分布状况。观测结果表明,大角度裂隙带的较密集部位,主要出现在距主厂房下游边墙约10m-15m和30m-35m范围之间的岩柱内,且随着时间的推移裂缝条数逐渐在增多。
In our country, many of the underground caverns of hydropower stations that have been built or under construction are often found with steeply dipping brittle cleavage zones or large cracks in the high-wall of the cavern. In order to explore the distribution, development and reasons of the cracks in the side wall of the large-scale underground powerhouse, the author takes the underground plant complex of Pubugou Project as the research object, and punches four rock columns running through the main plant and Observation boreholes in the main transformer room were observed with a borehole television camera and a digital panoramic borehole imaging system to obtain the distribution of cracks in the downstream wall of the main plant. The observation results show that the more densely fractured sites of the large-angle fracture zone mainly occur in the rock columns located about 10m-15m and 30m-35m away from the downstream wall of the main plant, and the number of fractures gradually increases with the passage of time .