某水电站地下厂房洞室支护设计

Design of the Support System for Underground Powerhouse Caverns in a Hydropower Station

通过对某水电站地下厂房洞室群在不同支护型式下的围岩变形、应力场分布、塑性区分布以及支护体系受力特征进行分析,确定了地下厂房的支护型式,采用系统锚杆+预应力锚索支护方案能有效控制塑性区发展深度,提高支护系统的安全性,保证地下厂房洞室群围岩的稳定性,可为同类型地下厂房支护设计提供参考。

The deformation,stress field distribution,and plastic zone distribution of the surrounding rock,and the stress characteristics of the support system for the underground powerhouse cavern group in a hydropower station with different support schemes are analyzed.The results show that the support scheme with systematic bolt and pre-stressed anchor cable can effectively control the development depth of the plastic zone,thus improving the safety of the support system and ensuring the stability of the surrounding rock.It can provide useful reference for the support design of the same type underground powerhouses.