基于三维有限元法的既有沉降下水电站厂房结构安全性评估研究  

Safety assessment of hydropower powerhouse structure with existing settlement based on three-dimensional finite element method

作　　者：沈思程 苏静波[1] 邵兵 汪振 王辉义 周杰 SHEN Sicheng;SU Jingbo;SHAO Bing;WANG Zhen;WANG Huiyi;ZHOU Jie(College of Harbour,Coastal and Offshore Engineering,Hohai University)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [3]国家能源局大坝安全监察中心,浙江杭州311122

出　　处：《大坝与安全》2024年第1期36-43,共8页Dam & Safety

基　　金：国家自然科学基金资助(51679081);中国长江三峡集团公司项目资助。

摘　　要：水电站长期运行过程中,周围工作环境改变引起的地基不均匀沉降对水电站结构的安全造成了很大影响。以某水电站工程为例,利用Midas/GTS NX软件建立三维有限元模型。首先,结合实际监测数据,采用强制位移法对厂房由于地层塌陷引起的不均匀沉降进行模拟。其次,在该既有沉降的情况下,模拟不同工况水电站厂房结构的应力变化情况,并对危险构件进行安全评估。最后,以不均匀沉降作为预警指标,提出安全监测控制方法。研究结果表明:通过强制位移法修正的三维有限元模型可以满足水电站在不均匀沉降下的安全性评估需求,可为水电站结构安全性分析与监测提供参考。The uneven settlement of foundation caused by changes in the surrounding working environ-ment during long-term operation of hydropower station has a significant impact on the safety of the hydro-power structures.Taking a hydropower station project as an example,Midas/GTS NX software is used to es-tablish a three-dimensional finite element model.First,based on actual monitoring data,the forced dis-placement method is used to simulate the uneven settlement of the powerhouse building caused by geologi-cal collapse.Second,with the existing settlement,the stress changes of the powerhouse structure under dif-ferent working conditions are simulated and safety assessment of dangerous components is conducted.Lastly,using uneven settlement as a warning indicator,a safety monitoring and control method is proposed.The research results indicate that the three-dimensional finite element model modified by the forced dis-placement method can meet the safety assessment requirements for hydropower stations with uneven set-tlement,and can provide reference for the safety analysis and monitoring of hydropower structures.

关 键 词：水电站 安全性评估 三维有限元模型 不均匀沉降 

分 类 号：TV698.1[水利工程—水利水电工程]