软基上混凝土铺盖施工期裂缝数值分析  

Numerical Analysis on Crack of Connecting Floor on Soil Base

作　　者：王海川[1] 万乾山[2] 王伯龙[1] 胡建业[1] 秦忠国[3] 

机构地区：[1]沂沭泗水利管理局,江苏徐州221000 [2]江苏省水利勘测设计研究院,江苏扬州225000 [3]河海大学工程力学系,南京210098

出　　处：《南水北调与水利科技》2007年第6期107-109,共3页South-to-North Water Transfers and Water Science & Technology

摘　　要：软土地基上的混凝土底板或者防渗铺盖一般不会出现施工期温度裂缝,但是在近期完成的嶂山闸加固工程中,上游接长的防渗铺盖在浇筑后30d左右出现了有规律的开裂现象。通过温度场和温度应力数值模拟,研究了该工程铺盖开裂的原因。计算结果显示,与新建工程的铺盖相比较,加固工程中接长铺盖的温度应力分布规律和数值有很大不同,原有铺盖对新浇部分的侧向约束是形成开裂的主要原因,提示在评价结构温度裂缝风险时,侧向约束是不可忽略的关键因素。Concrete impervious floor on soil base seems not to crack by thermal stress during the construction period. However, the exception happened in the Zhangshan Floodgate Project finished recently. Some regular temperature cracks appear in the upriver impervious floor after the con- crete poured about 30 days. This paper gives a study on the reasons of the concrete cracks by the temperature field and thermal stress simulation. The results show the temperature distribution and thermal stress in the impervious floor of the reinforcement project are much different from that in the impervious blanket of a new project,and main reasons of cracks are that the old concrete gives the new one a strong constraint on its side direction. It gives a hint that lateral restraint is an important factor for estimating the risk of structure temperature cracks.

关 键 词：加固工程 温度场 温度应力 混凝土裂缝 

分 类 号：TV43[水利工程—水工结构工程]