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地下洞室边墙松弛带范围与围岩岩性,开挖深度、时间等因素有关,而且是动态变化的。该文首先简要介绍了某水电站地下厂房概况,阐述了地下厂房边墙松弛带检测方法原理,然后以该水电站地下厂房为例,根据多次单孔声波和钻孔全景图像测试结果,分析了松弛带范围与开挖深度、岩体波速和时间之间的相互关系以及它在不同空间的变化规律。单孔声波测试和钻孔全景图象分析方法为指导施工开挖和岩体卸荷松弛支护设计提供了依据。
The scope of the relaxation zone of underground caverns is related to the lithology, excavation depth and time of the surrounding rock and is dynamic. This paper first briefly introduces the general situation of the underground powerhouse of a hydropower station, expounds the principle of the detection method of the slackwall of the underground powerhouse, and then takes the underground powerhouse of the hydropower station as an example. Based on the results of multiple single-hole sonic and borehole panoramic images, Band range and the depth of excavation, the relationship between rock mass velocity and time and its variation in different space. Single-hole sonic testing and panoramic image analysis of boreholes provide a basis for guiding the design of excavation and unloading relaxation support.