关于水电工程引水系统埋管状态下钢衬环向应力计算方法的探讨  

Discussion on the Calculation Issues of Circumferential Tensile Stress in Embedded Penstocks of Hydropower Project

作　　者：江献玉 柴建峰 洪达正 马传宝 苏静 程亚男 杨雷 梁宁[3] JIANG Xianyu;CHAI Jianfeng;HONG Dazheng;MA Chuanbao;SU Jing;CHENG Yanan;YANG Lei;LIANG Ning(Technology Center, State Grid Xinyuan Companyltd, Beijing 100073, China;Anhui Jixi Pumped Storage Power Station Co., Ltd., Jixi 245300, China;Institute of Geology and Geophysics, China Academy of Science, Beijing 100029, China)

机构地区：[1]国网新源控股有限公司技术中心,北京市100161 [2]安徽绩溪抽水蓄能有限公司,安徽省宣城市245300 [3]中国科学院地质与地球物理研究所,北京市100029

出　　处：《水电与抽水蓄能》2018年第3期67-71,共5页Hydropower and Pumped Storage

基　　金：国网新源公司科研项目"安徽绩溪抽水蓄能电站引水系统钢衬围岩联合受力反演分析研究"(编号:JXKY201503)资助

摘　　要：已有工程监测成果表明水电工程引水系统埋管状态下,当围岩单位抗力系数(K_0)较大时,K_0变化对钢衬环向拉应力σθ影响不明显;但现行规范NB/T 35056—2015推荐的计算公式中,σ_θ值和K_0有直接关系。本文结合实测资料,对比数值仿真和规范推荐公式,探讨埋管状态下σ_θ计算公式。结果表明,规范公式计算σ_θ时,直接采用K_0,忽略实际存在混凝土垫层,可能会导致σ_θ计算结果出现偏差。上述认识对类似工程设计具有一定的参考价值。Existing monitoring data from constructed pumped storage power stations and other engineering practices show the rock resistant coefficient does not clearly affect the circumferential tensile stress in embedded penstocks if the rock resistant coefficient is relatively great,but currently in effect Specification-DL/T 5141,the computational formula of the circumferential tensile stress has direct relation with the rock resistant coefficient.Based on monitoring data,Specification method and numerical simulation to research how to accurately calculate the stress of penstock.The results show that in Specification method the concrete cushion be ignored,directly adopt the rock resistant coefficient to computational formula,the Specification method maybe produce deviation or error in the circumferential tensile stress and sharing ratio of internal pressure in bedrock.And suggest adopting appropriate numerical simulation in the design of penstocks.The results have important value on engineering design in other similar hydropower projects.

关 键 词：埋管 单位抗力系数 混凝土垫层 环向拉应力 规范方法 仿真分析 

分 类 号：TV74[水利工程—水利水电工程]