惠州抽水蓄能电站输水隧洞洞轴线走向优化研究

Study on Optimization for Axis Trend of Water Conveyance Tunnel in Huizhou Pumped Storage Power Station

随着抽水蓄能电站工程建设的不断增多,抽水蓄能电站地下厂房洞室群围岩稳定性越来越受到重视。而洞室洞轴线走向选取是否合理将直接影响洞室的开挖进度和安全。洞室布置除了要满足功能要求外,还要充分考虑结构面产状等多方面的因素。当洞室穿越断层、节理等破碎带时,要尽可能让洞室不同结构面组合成的围岩关键块体达到最小。对于上述问题,该文基于Unwedge程序的工作原理,以广东惠州抽水蓄能电站输水隧洞为例,运用此程序,考虑输水隧洞计算区域内不同区段不同结构面组合在不同洞室走向条件下围岩关键块体的大小,评价隧洞围岩稳定性,提出了输水隧洞的合理走向。

With the constant growing of quantity of pumped storage power station constructions, it attracts more and more attention in the stability for surrounding rockaround the caverns of these constructions＇ underground power houses. Thus, whether it is reasonable for the choice of the cavern axis strike or not directly influences the schedule and security of excavation. Besides the satisfaction with the functional requirements, the arrange- ment of the caverns should take the occurrence of the structural surface and so on into full consideration. When the caverns pass through the faults ,joints or other fracture zones, the key blocks of the surrounding rock con- sisted by the different structural surfaces should reach the minimum as possible. For the problems above, this paper puts forward the reasonable strike after evaluating the stability for the surrounding rock of the caverns while taking the water conveyance tunnel of Huizhou pumped storage power station in Guangdong as an exam- ple. Simultaneously, the calculation and optimization in this paper are based on the work principle of Unwedge program and taken the key block＇s size into consideration which is different in strike and combination of the structural surface in the computational domain.