基于实测资料的混凝土拱坝反馈分析及安全度评价  

Feedback analysis and safety degree evaluation of concrete arch dam based on measured data

作　　者：程井[1] 孟凡轩 李宗樾[2] CHENG Jing;MENG Fanxuan;LI Zongyue(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Dam Safety Monitoring Center of Guizhou Province, Guiyang 550002,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]贵州省大坝安全监测中心,贵州贵阳550002

出　　处：《武汉大学学报（工学版）》2019年第4期297-302,310,共7页Engineering Journal of Wuhan University

基　　金：贵州省水利厅科技专项经费项目(编号:KT201812);水利部堤防安全与病害防治工程技术研究中心开放课题基金项目(编号:2018003);国家重点研发计划项目(编号:2016YFC0401601)

摘　　要：基于原型观测资料及坝体坝基弹模反演结果,采用有限元法对贵州地区某混凝土拱坝进行了反馈分析及安全度复核.首先对大坝在不同设计工况下的工作性态进行了反馈分析,并对坝体弹模进行了敏感性分析;然后采用强度储备安全系数法和超载法,对拱坝沿坝肩薄弱面的抗滑稳定性及大坝坝体损伤进行研究,并采用塑性区贯通和迭代过程不收敛时的强度储备安全系数或超载系数作为大坝安全度评价指标.本工程研究结果表明,不考虑温度荷载时,坝体弹模值主要影响坝体应力的分布,对最大拉应力值影响不大;考虑温度荷载后坝体弹模值对坝体的最大拉应力及分布均有显著影响;温度荷载对沿坝肩薄弱面的大坝抗滑稳定安全度影响不大,但对基于坝体损伤分析的大坝整体安全度有一定影响.Based on prototype observation data and inversed elastic modulus of the dam and foundation, a concrete arch dam in Guizhou Province is inversely analyzed and its safety is checked. Firstly the feedback analysis is carried out for different design conditions, as well as the sensitivity analysis of the dam elastic modulus. Then the safety concerning both the weak abutment slide stability and the dam damage is studied by using the strength margin safety factor method and the over-loading method respectively. The connectivity of plastic zone and the non-convergence of iteration are taken as the evaluation criterion of dam safety degree. Research results for the given project show that without considering the temperature load, the elastic modulus mainly influence the stress distribution, but has few impact on the maximum value of the tensile stress. Considering the temperature load, the elastic modulus influences both the distribution and maximum value of the tensile stress. Temperature load has little influence on the anti-sliding safety along the weak interface in the abutments;but it has a certain impact on the dam safety degree obtained by dam damage analysis.

关 键 词：拱坝 安全度 反馈分析 有限元法 超载法 强度储备系数 

分 类 号：TV37[水利工程—水工结构工程]