蟠龙抽水蓄能电站地下厂房顶拱软岩分布与支护影响分析

Analysis on the Distribution and Supporting Effect of Top Arch Soft Rock of Underground Powerhouse of Panlong Pumped-storage Power Station

支护是地下结构中不可或缺的部分,能提高围岩的稳定性,保证施工、运行的安全。针对蟠龙抽水蓄能电站地下厂房顶拱存在的软岩层,建立三维有限元模型,计算不同软岩厚度和地质缺陷的影响,分析顶拱围岩稳定性和支护效果。结果表明:地质条件越差时,顶拱位移越大,塑性区发育程度越大;支护作用下位移减小,塑性区发育程度降低,且地质条件越差时,支护效果越显著。

Supporting is an indispensable part of underground structures, and it can improve the stability of surrounding rock and ensure the safety of construction and operation. Aiming at the soft rock layer in the top ach of underground powerhouse of Panlong Pumped-storage Power Station, a three-dimensional finite element model is established to analyze the influences of different soft rock thickness and geological defects on surrounding rock stability and the effect of supporting. The results show that,(a) the worse the geological condition, the greater the displacement of top arch and the larger the plastic zone development, and (b) under the action of supporting, the displacement decreases and the development of plastic zone decreases, and the worse the geological condition, the more remarkable the supporting effect.