基于块体理论的地下洞室施工期定位块体稳定性分析研究

Stability Analysis of Positioning Block in Construction Period of Underground Cavern Based on Block Theory

块体理论是近年来发展和完善的一种适用于岩体稳定性分析的有效方法。以阳江抽水蓄能电站地下厂房洞室群为例,阐述了块体理论解决实际工程问题的关键技术和思路,应用块体理论重点对主厂房施工期存在的定位块体问题进行了分析。根据地下厂房实际开挖揭示的地质条件和块体分析结果,在现有支护措施下,阳江抽水蓄能电站主厂房施工期揭露的块体基本上有一定的安全裕度,部分块体的埋深较浅,结构面受开挖爆破影响较大,考虑一定的支护措施后,可保证块体的稳定性。研究成果可为同类工程提供借鉴。

Block theory is an effective method which is suitable for the rock mass stability analysis.Based on the cavern group of the underground powerhouse of Yangjiang Pumped Storage Power Station,the key technologies and ideas of block theory to solve practical engineering problems is presented.Block theory is adopted to analyze the block problems existing in the construction period of the main power house.According to the geological conditions revealed by the actual excavation of underground powerhouse and the results of block analysis,under the existing support measures,the blocks exposed during the construction period of the main powerhouse basically have a certain safety margin.The buried depth of some blocks is relatively shallow,and the structural plane is greatly affected by excavation and blasting.Considering certain supporting measures,the stability of the block can be ensured.The research results can provide reference for similar projects.