软基上水闸截面积和地基对预应力效果的影响规律  

Influence law of cross-sectional area of sluice and foundationon prestressed effect on soft foundation

作　　者：陈坚[1] 于宙 王丽[1] 周丹 强晟 CHEN Jian;YU Zhou;WANG Li;ZHOU Dan;QIANG Sheng(Huaian Water Conservancy Survey and Design Research Institute Co.,Ltd.,Huaian 223005,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Nanjing Ruidi Construction Science and Technology Co.,Ltd.,Nanjing 210029,China)

机构地区：[1]淮安市水利勘测设计研究院有限公司,江苏淮安223005 [2]河海大学水利水电学院,江苏南京210098 [3]南京瑞迪建设科技有限公司,江苏南京210029

出　　处：《江苏水利》2021年第1期25-31,共7页Jiangsu Water Resources

基　　金：江苏省水利科技项目(2019008);国家自然科学基金面上项目(51679074)。

摘　　要：水闸闸墩是一种薄壁混凝土结构,容易在施工期温度应力的作用下产生裂缝,预应力技术是一种降低闸墩内部拉应力的有效方法。为研究软基上水闸截面积对预应力作用效果的影响规律,运用有限单元法得到了预应力张拉荷载作用在不同截面积的水闸结构上时,在闸墩内部产生的拉应力降幅,并拟合出两者间的定量关系。通过基本力学原理,推导出了两者间的解析公式。在仿真计算值与解析值的对比分析中,发现地基对预应力效果有一定的消弱效果,因此针对具体消弱效果进行了研究。结果显示,地基会使预应力的作用效果降低10%,而水闸的截面积和常见软基的弹模对此消弱效果的影响不大。Sluice pier is a kind of thin-wall concrete structure,which is easy to crack under the action of temperature stress during construction period.Prestressed technology is an effective method to reduce tensile stress in pier.In order to study the influence law of the cross-sectional area of sluice on prestressed effect on soft foundation,finite element method was used to obtain the decrease of tensile stress in the pier when the prestressed tension load acted on sluice structures with different cross-sectional areas,and the quantitative relationship was fitted.Through the basic mechanics principle,the analytic formula between the two was derived.In the comparison between simulated value and analytical value,it's founded that the foundation had a certain attenuation effect on the prestressed effect,so the specific attenuation effect was studied.The results showed that the foundation reduced the prestressed effect by 10%,but the cross-sectional area of sluice and the elastic modulus of common soft foundation had little influence on the attenuation effect.

关 键 词：预应力 混凝土防裂 有限元计算 软基 水闸 

分 类 号：TV66[水利工程—水利水电工程]