向家坝右岸坝后电站垫层蜗壳优化设计研究  

Study on optimum design of spiral case with cushion layer in Xiangjiaba right bank dam power station

作　　者：刘海龙 王少伟 尹思全 LIU Hailong;WANG Shaowei;YIN Siquan(Xiangjiaba Hydropower Plant,China Yangtze Power Co.,Ltd,Yibin 644600,China;School of Envir onmental and Safety Engineering,Changz hou University,Changzhou 213164,China;Wudongde Engineering Construction Dam Project Depar tment,China Three Gorges Construction Management Co.,Ltd,Luquan 650041,China)

机构地区：[1]中国长江电力股份有限公司向家坝电厂,四川宜宾644600 [2]常州大学环境与安全工程学院,江苏常州213164 [3]中国三峡建设管理有限公司乌东德工程建设部大坝项目部,云南禄劝650041

出　　处：《南水北调与水利科技》2018年第S01期94-98,103,共6页South-to-North Water Transfers and Water Science & Technology

摘　　要：针对向家坝右岸坝后电站拟采用的垫层蜗壳方案,以蜗壳外包混凝土应力、承载比、蜗壳应力、机墩不均匀上抬变形等为指标,对软垫层的铺设范围和材料弹性模量进行三维有限元优化分析。计算结果表明:软垫层的设置能够充分发挥钢衬的承载作用,改善蜗壳外包混凝土的应力状态;垫层包角越大,蜗壳最大Mises应力越大,且基本呈线性增长趋势;机墩竖直向位移沿圆周分布的不均匀程度随着垫层平面铺设范围的增大而减小;垫层弹性模量越高,传递给外包混凝土的内水压力比例越大。Based on the analysis indexes of stress and bearing ratio of surrounding concrete and spiral case,and the uneven lifting deformation of turbine pier,the laying range and elastic modulus of cushion layer of the proposed spiral case for Xiangjiaba right bank dam power station was optimally designed by three dimensional finite element analysis.Results show that the laying of cushion layer will give full play to the bearing capacity of the steel spiral case and improve the stress state of surrounding concrete.The bigger the cushion angle,the greater the Mises stress of the spiral case,and a linear growth trend exists.The uneven distribution of the vertical displacement along the circumference of the pier decreases with the increase of laying range of cushion layer.The higher elastic modulus of the cushion,the greater proportion of water pressure transferred to the surrounding concrete.

关 键 词：向家坝水电站 垫层蜗壳 优化设计 有限单元法 

分 类 号：TV339[水利工程—水工结构工程]