断层对硬梁包水电站主厂房围岩稳定性的影响分析  

Analysis of the Effect of the Fault on Surrounding Rock Stability of the Main Plant of Yingliangbao Hydropower Station

作　　者：陈涛 柏纪锋 袁超义 曹世奇 蒲平新 CHEN Tao;BAI Jifeng;YUAN Chaoyi;CAO Shiqi;PU Pingxin(Sichuan Huaneng Luding Hydropower Co.,Ltd.,Luding Sichuan 626100;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan Hubei 430064)

机构地区：[1]四川华能泸定水电有限公司,四川泸定626100 [2]中国科学院武汉岩土力学研究所,湖北武汉430064

出　　处：《四川水力发电》2023年第1期6-9,25,共5页Sichuan Hydropower

基　　金：华能集团总部科技项目:HNKJ21-HF317《复杂构造背景下大型洞群物理数值仿真与动态设计研究》技术研究资助。

摘　　要：断层等结构面对地下洞室的稳定性起着控制性作用,研究断层作用下的地下洞室的稳定性对工程的施工安全及支护设计具有重要意义。以硬梁包水电站为例,分析主厂房区域的断层F5对其围岩稳定性的影响,采用Flac3D数值模拟软件,引入考虑开挖卸荷开裂后力学参数等效降低的岩体劣化本构模型,对主厂房全部开挖后,不同断面的岩体劣化特征、卸荷变形量、重分布应力特征进行对比分析。结果表明:厂房洞室开挖完成后,F5断层使围岩变形增大了15%~20%,使局部变形最大可达到100 mm左右,断层影响区域岩体松弛程度相比于无断层区域明显增大。Fault and other structure planes play a dominating role in the stability of the underground cavern.The stability analysis of the underground cavern under the fault action is of great significance to the construction safety and support scheme of the project.Taking Yingliangbao Hydropower Project as an example,the influence of the fault on the surrounding rock stability was analyzed using Flac3D numerical simulation software,and a rock mass deterioration constitutive model considering the equivalent reduction of mechanical parameter after excavation unloading is introduced.After the excavation of the main plant,rock deterioration characteristics,unloading deformation modulus and stress redistribution characteristics of different sections was compared and analyzed.The results show that after the excavation of the caverns,the existence of Fault F5 created an increase of the surrounding rock deformation by 15%~20%,and the local deformation can reach about 100 mm,and the relaxation degree of rock mass in the fault affected area significantly increased compared with the nonfree area without fault.

关 键 词：围岩稳定性 断层 岩体劣化力学模型 地下厂房 

分 类 号：TV223.32[水利工程—水工结构工程]