基坑锚杆受力及变形机理的现场试验

Test in site about force and deformation mechanism of foundation pit anchor

为进一步弄清锚杆的受力及变形机理,对广西柳州星河大厦基坑锚杆的轴力和基坑的侧向位移进行了现场试验,试验分析表明:①只有基坑发生位移时锚杆才会受力,并随动态的施工过程而持续变化;②锚杆的轴力呈中间大、两端小的不均匀分布,并且随基坑的不断开挖锚杆的轴力值逐渐增大;③基坑侧向位移随施工过程的进行呈逐渐增大的趋势,最大位移出现在基坑顶部。这为建立合理的力学模型计算基坑周围锚固体的变形提供科学依据。

In older to find out force and deformation mechanism of foundation pit anchors, the lateral displacement of a foundation pit of Guangxi Liuzhou Xinghe mansion and the axial force of the pit anchors was tested in site. The conclusions are as follows： ① The anchors would be subjected to force only if the displacement of the foundation pit appears, and the force would change continually with the progress of the excavation ; ②The axial force of the anchors appears to be higher in the middle and lower at both ends. With the digging going on, the axial force of the anchors increases gradually; ③The lateral displacement of the foundation pit tends to increase gradually with the excava- tion, and the maximal displacement is on the top of the foundation pit. This test provides a scientific base for establishment of reasonable mechanical model to calculate anchor deformation of foundations.