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

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 certain reference value for the support design and construction of foundation pit engineering.