非稳定温度场对坝体孔口应力的影响  

Influence on the Stress of Dam Orifice of Unsteady Temperature Field

作　　者：常黎明 何鲜峰[2,3] CHANG Liming;HE Xianfeng(Shanghai Waterway Engineering Design and Consulting Co.,Ltd.,Shanghai 200120,China;Yellow River Institute of Hydraulic Research,YRCC,Zhengzhou 450003,China;Research Center on Levee Safety Disaster Prevention,MWR,Zhengzhou 450003,China)

机构地区：[1]中交上海航道勘察设计研究院有限公司,上海200120 [2]黄河水利委员会黄河水利科学研究院,河南郑州450003 [3]水利部堤防安全与病害防治工程技术研究中心,河南郑州450003

出　　处：《人民黄河》2018年第4期112-116,共5页Yellow River

基　　金：水利部公益性行业科研专项(201401022);黄河水利委员会黄河水利科学研究院科研专项(HKY-JBYW-2014-04)

摘　　要：混凝土重力坝正常运用情况下主要承受自重、水压力、泥沙压力、扬压力和温度荷载,温度荷载对坝体孔口应力的影响很大。与大坝接触的外界气温和水温为年周期变化的非稳定温度场边界,经过几十年的运行,可以认为坝体边界混凝土温度也为年周期变化的非稳定温度场。选取三门峡大坝3#溢流坝段为模型,采用三维有限单元法,按不考虑和考虑温度荷载两种情况,运用ANSYS软件将不同月份的温度场与静力场进行耦合计算,对3#溢流坝段的深孔与底孔进行了应力分析。分析表明,孔顶和孔底在较冷月份表现为拉应力,且超过混凝土的抗拉强度,故需在孔口周围配筋,在孔口运行过程中要保证钢筋不被裸露或侵蚀。Under the normal conditions,the concrete gravity dam is mainly subjected to gravity,water pressure,sediment pressure,uplift pressure and temperature loads.After years of a dam prototype observation,it finds out that the temperature load accounts for a great influence factor on the stress of the dam orifice.The surrounding air temperature and water temperature are the periodic changing unsteady temperature field borders.After decades of operation,it is considered that the concrete dam and bedrock temperature are also the periodic changing unsteady temperature field.It selected the No.3 spillway dam section of Sanmenxia Dam as a model,using three-dimensional finite element method and applying ANSYS to couple the different months temperature field and the static force field and analyze the stress of deep hole and bottom hole of the spillway dam by two cases of not considering and considering the temperature load.The analysis shows that the top of the hole and the bottom of the hole in the cold months show tensile stress and more than the tensile strength of concrete,it is necessary to configure the reinforcing bar around the hole,the hole in the course of operation to ensure that the reinforcing bar is not exposed or eroded.

关 键 词：温度荷载 非稳定温度场 有限单元法 孔口应力 三门峡大坝 

分 类 号：TV315[水利工程—水工结构工程]