非对称荷载下基坑内支撑结构受力与变形试验研究  

Experimental Study on Stress and Deformation of Internal Support Structure under Asymmetric Load

作　　者：葛帆 李泽江 刘家国 金亚兵 傅旭东[3] Ge Fan;Li Zejiang;Liu Jiaguo;Jin Yabing;Fu Xudong(Shenzhen Geology Bureau,Shenzhen,Guangdong 518023,P.R.China;Dali Water conservancy Project Construction Management Center,Dali,Yunnan 671000,P.R.China;School of Civil Engineering Wuhan University,Wuhan,430072,P.R.China)

机构地区：[1]深圳市地质局,广东深圳518029 [2]大理州水利工程建设管理中心,云南大理671000 [3]武汉大学土木建筑工程学院,武汉430072

出　　处：《地下空间与工程学报》2024年第1期162-170,共9页Chinese Journal of Underground Space and Engineering

基　　金：广东省深圳市地质局地质工程院士工作站专项经费资助项目(2013B090400025)。

摘　　要：基坑开挖后其坡顶堆载是引发深基坑事故的重要因素,在承受不同程度的非对称荷载作用开挖结束后,分别对基坑两侧进行堆载模型试验,分析研究了非对称堆载过程中支护结构的受力与变形特性。结果表明:在非对称荷载作用下进行基坑开挖,开挖结束后在一侧堆载过程中,开挖面以上支护结构整体向无堆载侧移动;荷载小侧堆载下,墙体位移变化速率随堆载的增大而增大;荷载大侧堆载过程中,当堆载小于某一值时,墙体位移与堆载大小表现为线性关系,当堆载大于某一值时,墙体位移变化速率随堆载的增大而增大;基坑对称开挖结束后,内支撑的轴力随着堆载的增加近似线性增大,且开挖面上一道支撑轴力较第一道内支撑增加更为明显。研究成果对基坑工程支护设计与施工具有一定的参考价值。After the excavation of the foundation pit,the piles of load on the ground is an important factor that causes the accident of the deep foundation pit.After the excavation of the foundation pit subjected to different degrees of asymmetric loads,the model test of the piles of load was carried out on the two sides respectively,and the deformation and stress characteristics of the supporting structure during the asymmetric piles of load were analyzed and studied.The results show that the supporting structure above the excavation surface moves as a whole to the side without piles of load during the stacking process on one side after the foundation pit excavation is completed under the action of asymmetric load;The rate of change of the body displacement increases with the increase of the piles of load;during the stacking process on the large side of the load,when the piles of load is less than a certain value,the wall displacement and the piles of load have a linear relationship,and when the piles of load is greater than a certain value,the rate of change of the wall displacement increases with the increase of the piles of load.After the symmetrical excavation of the foundation pit,the axial force of the inner support increases approximately linearly with the increase of the piles of load,and the axial force of the upper support on the excavation surface increases more obviously than that of the first inner support. The research results of this paper have certainreference value for the support design and construction of foundation pit engineering.

关 键 词：深基坑工程 非对称堆载 模型试验 受力与变形 

分 类 号：TU473[建筑科学—结构工程]