中东某水电站地下厂房开挖支护数值模拟研究  

Numerical simulation of excavation and support for underground powerhouse of a hydropower station in the Middle East

作　　者：付亚东[1] 杜甜甜 王雅 郭鸿[2,3,4] 蒋红 FU Yadong;DU Tiantian;WANG Ya;GUO Hong;JIANG Hong(Sinohydro Fifth Engineering Bureau Co.,Ltd.,Chengdu 610200,China;School of Civil Engineering and Architecture,Shaanxi University of Technology,Hanzhong 723001,China;Society of Human Settlements,Shaanxi University of Technology,Hanzhong 723001,China;Research Center of Geotechnical Environment and Disaster Control in Qinba Mountain,Shaanxi University of Technology,Hanzhong 723001,China)

机构地区：[1]中国水利水电第五工程局有限公司,四川成都610200 [2]陕西理工大学土木工程与建筑学院,陕西汉中723001 [3]陕西理工大学人居环境科研学社,陕西汉中723001 [4]陕西理工大学秦巴山地岩土环境与灾害防治研究中心,陕西汉中723001

出　　处：《武汉大学学报(工学版)》2024年第S2期150-155,共6页Engineering Journal of Wuhan University

摘　　要：针对中东某水电站地下厂房的开挖和支护问题,采用弹塑性有限差分法进行三维数值模拟研究。研究目的在于评估复杂地质条件下地下厂房洞室群的稳定性,以及开挖和支护措施对岩体位移、应力分布和塑性区的影响。通过模拟断层影响和开挖过程,分析了2种工况(毛洞开挖和支护开挖)下洞室周围岩体的位移、应力和塑性区分布特征,评价了地下洞室群的安全稳定性。研究结果表明:相较于毛洞开挖,支护开挖能显著降低围岩的水平和竖向位移、减小主应力分布范围和拉应力区,从而提高了岩体的稳定性;塑性区的变化规律在2种工况下基本一致,但支护开挖工况下的塑性区深度明显减小,表明支护措施能有效控制岩体的塑性变形。通过制定合理的支护结构设置和施工方案,保证支护措施的有效性,为工程实践提供了可靠的理论依据。This paper aims at the excavation and support of the underground plant of a hydropower station in the Middle East and uses the elastoplastic finite difference method is used to carry out threedimensional numerical simulation research.The purpose of this study is to evaluate the stability of underground plant caverns under complex geological conditions,as well as the influence of excavation and support measures on the displacement,stress distribution and plastic zone of rock mass.By simulating the influence of faults and the excavation process,the displacement,stress and plastic zone distribution characteristics of the rock mass around the cavern under two working conditions(cavity excavation and support excavation)are analyzed,and the safety and stability of the underground cavern group are evaluated.The results show that the support excavation can significantly reduce the horizontal and vertical displacement of the surrounding rock,reduce the distribution range of the principal stress and the tensile stress zone,and improve the stability of the rock mass compared with the excavation of the cavity.The variation law of the plastic zone is basically the same under the two working conditions,but the depth of the plastic zone under the support excavation is significantly reduced,which indicates that the support measures can effectively control the plastic deformation of the rock mass.Through the reasonable setting of supporting structure and construction scheme,the effectiveness of the support measures is guaranteed,which provides a reliable theoretical basis for engineering practice.

关 键 词：地下厂房 围岩支护 模拟分析 数值模型 

分 类 号：TU45[建筑科学—岩土工程]