某电站地下厂房裂隙发育规律及其对围岩稳定性的影响

doi:10.13278/j.cnki.jjuese.20180182

摘要/Abstract

摘要： 裂隙岩体内的洞室围岩块体稳定问题是抽水蓄能电站地下厂房建设中要解决的重要工程地质问题。为了在厂房开挖之前较准确地预测不稳定块体的发育位置，本文以某抽水蓄能电站为例，对厂房探洞内的裂隙进行统计分析，结合厂房区构造断层的发育情况，确定了裂隙发育规律；根据裂隙发育规律将厂房区岩体划分为A、B、C、D、E 5个构造分区；并利用Unwedge程序，以各分区裂隙组合为基础，确定可能形成的块体位置，评价了其稳定性状况。研究结果表明，裂隙受多期构造控制，在一定范围内具有方向性，A、E区优势裂隙与构造产状接近，B、C、D区优势裂隙与构造产状斜交；裂隙在厂房上、下游侧边墙各形成6处潜在不稳定块体，顶拱处形成10处潜在不稳定块体，右端墙处形成1处潜在不稳定块体。

关键词: 抽水蓄能电站, 块体理论, 裂隙发育规律, 围岩稳定性, Unwedge程序

Abstract: Stability of surrounding rock mass of a cavern in a fractured rock mass is an important engineering geological problem to be solved in an underground plant of a pumped storage power station. Taking a pumped storage power station as an example, in order to accurately predict the unstable block position before excavation, we statistically analyzed the fractures in the hole, and determined the law of fracture development with combination of the fault development in the plant area. On the basis, the rock mass was divided into five tectonic zones:A, B, C, D and E. By the Unwedge program, the position of the potential block was determined and its stability was evaluated. The results show that the fractures are controlled by multi-stage tectonic faults, and are directional in a certain range. The occurrence of the dominant fractures in region A, E are close to the tectonic fault occurrences, and the dominant fractures in region B, C, D are cross the tectonic faults obliquely; six potential unstable blocks are formed on each side of the upper and lower side walls of the plant, ten potential unstable blocks at the top of the arch, and one potential unstable block at the right end wall.

Key words: pumped storage power station, block theory, fracture development law, stability of surrounding rock, Unwedge program

中图分类号:

TU42

李志远, 宫海灵, 张永辉, 李璞. 某电站地下厂房裂隙发育规律及其对围岩稳定性的影响[J]. 吉林大学学报(地球科学版), 2018, 48(5): 1574-1580.

Li Zhiyuan, Gong Hailing, Zhang Yonghui, Li Pu. Fracture Development Law and Its Influence on the Stability of Surrounding Rock of a Power Station Underground Plant[J]. Journal of Jilin University(Earth Science Edition), 2018, 48(5): 1574-1580.

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