卡洛特水电站埋藏式压力钢管联合受力研究  

Study on interaction between embedded penstock and surrounding rock of Karot Hydropower Station

作　　者：汪碧飞 李月伟 孔剑 胡剑杰 WANG Bifei;LI Yuewei;KONG Jian;HU Jianjie(Changjiang Survey,Planning,Design and Research,Co.,Ltd.,Wuhan 430010,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010

出　　处：《人民长江》2022年第2期138-142,163,共6页Yangtze River

摘　　要：考虑钢管与围岩联合承载,采用有限元对钢管、回填混凝土与围岩组成的联合承载体进行了非线性的计算分析,将有限元计算结果与规范计算结果进行了对比,比较了内水压力、围岩与钢管缝隙等因素对钢管受力特性及围岩分担率的影响。研究表明:不同的内水压力下,围岩分担率不同,一般随内水压力的增加而减小。缝隙影响围岩的分担率,缝隙越小,围岩分担的内水压力就越大;当缝隙超过一定值时,钢管接近明管的受力状态。回填混凝土采用弹塑性断裂本构模型的实体单元模拟能较好地反映材料的力学性能,宜采用该方法对埋藏式压力钢管进行受力分析与工程设计。The three-dimensional finite element method was used to simulate the combined bearing structure of penstock,backfill concrete and surrounding rock of Karot Hydropower Station.The backfill concrete and surrounding rock were simulated by solid element and spring element respectively,and the results were compared with that of the specification calculation.The influence of internal water pressure,the gap between surrounding rock and penstock on the mechanical characteristics of penstock and the sharing ratio of surrounding rock were compared.The results show that under different internal water pressure,the sharing rate of surrounding rock is different,which generally decreases with the increase of internal water pressure.The smaller the gap,the greater the internal water pressure shared by the surrounding rock.When the gap exceeds a certain value,the stress state of penstock approaches the exposed penstock.The solid element simulation of elastic-plastic fracture constitutive model for backfill concrete can better reflect the mechanical properties of materials,so this method should be used for stress analysis and engineering design of embedded penstock.

关 键 词：埋藏式压力钢管 联合承载 三维有限元模型 围岩分担率 

分 类 号：TV732.41[水利工程—水利水电工程]