论文部分内容阅读
凤滩水电站计划扩大装机容量300MW,地下厂房区的岩体因各种结构面发育,在取得了岩体地应力的测试成果后,进一步作厂房区围岩稳定分析的论证研究。本文初步尝试从岩性与节理密集带特点,地形与地应力关系以及结构面之组合等方面进行分析探讨,扼要提出定性分析意见。认为地下厂区选在顺河谷方向上,其长轴与各主要结构面夹角甚大,水平地应力甚低,总的是不可能发生大体积坍塌。施工开挖中须采用新技术,如喷锚网联合支护等,并辅以现场洞室岩体原位监测手段,以防止拱顶发生拉应力及拱肩与边墙等局部失稳。
Fengtan Hydropower Station plans to expand the installed capacity of 300MW, the underground plant area of the rock due to the development of various structural planes, obtained in the rock mass stress test results, and further for the stability analysis of the surrounding rock plant demonstration area. This paper tries to analyze and discuss the characteristics of lithology and jointed intensive belt, the relationship between topography and geostress and the combination of structural planes, and gives a brief introduction of qualitative analysis. It is considered that the selection of underground factories is in the direction of Shunhe Valley. The long axis of the underground factory area has a great angle with each of the major structural planes and the horizontal stress is very low. In general, large-scale collapse is impossible. During construction excavation, new technologies such as joint support of spray-shot anchor network and so on shall be adopted in excavation and excavation, supplemented by in-situ monitoring of rock mass in situ to prevent tensile instability and partial instability of vault shoulders and side walls.