和静抽水蓄能电站主厂房开挖卸荷围岩变形与支护模拟研究  

Simulation Study on Deformation and Support of Surrounding Rock during Excavation and Unloading of Main Powerhouse of Hejing Pumped Storage Power Plant

作　　者：李丽君 马彬[2] LI LiJun;MA Bin(Xinjiang Tarim River Basin Authority,Korla 841000,China;Department of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]新疆塔里木河流域干流管理局,库尔勒841000 [2]西安科技大学建筑与土木工程学院,西安710054

出　　处：《西北水电》2023年第4期82-88,共7页Northwest Hydropower

摘　　要：主厂房开挖与支护是整个厂房系统的核心。基于和静电站地下主厂房开挖工程,通过数值模拟手段,研究了开挖与支护过程中主厂房围岩变形破坏特征。结果表明:开挖工况顶拱最终下沉量约为20 cm,支护工况拱顶最大下沉降至14 cm,降幅30%,支护措施有效控制了围岩变形;围岩以剪切破坏为主,硐周小部分区域为拉剪破坏,拱顶、上游侧边墙、下游侧边墙的塑性区深度降低了约34%、27%、25%,缓解了高边墙效应;最小主应力σ_(3min)的正值(拉应力)区域主要位于边墙附近,支护后围岩应力得以释放,应力水平逐渐降低,拱顶、拱顶与边墙交接处最小主应力σ_(3min)变为负值(压应力),应力场环境得到改善,承载能力逐步增强。Excavation and support of main powerhouse are the core of the whole underground powerhouse system.Based on the excavation works of the underground powerhouse of the Hejing Hydropower Station,this paper studies the deformation and failure characteristics of the surrounding rock of the main powerhouse during excavation and support by means of numerical simulation.The results show that:the final subsidence of the top arch is about 20 cm under excavation condition,and the maximum subsidence of the top arch under supporting condition is 14 cm,with a reduction of 30%.The supporting measures effectively control the deformation of the surrounding rock.The surrounding rock is mainly shear failure,and a small part of the surrounding area is tensile shear failure.The depth of the plastic zone of the vault,upstream side wall and downstream side wall is reduced by about 34%,27%and 25%respectively,which alleviates the effect of high side wall.The positive value(tensile stress)of the minimum principal stressσ_(3min)is mainly located near the side wall.After support,the surrounding rock stress is released,the stress level gradually decreases,and the minimum principal stress σ_(3min) becomes negative(compressive stress)at the arch and the junction between the arch and the side wall.The stress field environment is improved,and the load bearing capacity is gradually enhanced.

关 键 词：主厂房 开挖卸荷 围岩稳定 数值模拟 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术] TV222[自动化与计算机技术—计算机科学与技术]