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本电站地下厂房的地质条件比较复杂。在区域地质构造影响下,陡倾角和缓倾角断裂及其同方向裂隙发育,纵横切割,将厂房和尾水调压井间的岩柱分割成十多个块体,破坏了岩柱的完整性,威胁着岩柱的稳定性。同时,在厂房上下游边墙的局部地段形成比较严重的不稳定岩体。此外,由于地质勘探资料不足,厂房轴线选择和地下建筑物布置也不尽合理,洞室密度过大,交叉口多达19个,这更增加了地下厂房枢纽修建的困难。对比,在各关键部位采取了工程结构处理措施,诸如深孔锚桩、空心锚洞和横向撑墙及撑梁等;调整了局部的布置;采用了比较切合实际的施工程序和一系列施工安全技术措施,如戴、锁、锚、插、撑、箍等。从原型观测和用有限元法对围岩应力应变计算成果的分析看,以上这些措施都是切实有效的,保证了地下厂房的顺利建成和安全运行。今后,仍将继续加强原型观测和研究工作。
The underground power plant underground geological conditions are more complicated. Under the influence of the regional geological structure, the steep dip and gentle dip fracture and its fractures in the same direction are developed and cut horizontally and vertically. The rock columns between the workshop and the tailrace surge well are divided into more than 10 blocks, which destroy the integrity of the rock columns. Threatening the stability of the rock column. At the same time, more serious unstable rock mass is formed in some sections of the upstream and downstream side walls of the plant. In addition, due to the lack of information on geological prospecting, the choice of plant axis and the layout of underground structures are not reasonable, and the density of the cavern is too large. As many as 19 intersections increase the difficulty of constructing underground powerhouse hubs. In contrast, structural measures such as deep-hole anchor piles, hollow anchor holes and transverse support walls and spars have been adopted at all key locations; local arrangements have been adjusted; more realistic construction procedures and a series of construction safety measures have been adopted Technical measures, such as wearing, lock, anchor, plug, stay, hoops and so on. From the observation of the prototype and the analysis of the stress and strain calculation results of the surrounding rock with the finite element method, all the above measures are effective and effective, which ensures the smooth construction and safe operation of the underground powerhouse. In the future, prototype observation and research work will continue to be strengthened.