Influence Of Lateral Limited Subgrade Replacement Rate On Bearing Capacity Of Silt

There are many factors affecting the bearing capacity of composite foundations,such as site conditions,pile length,type of piles,etc.These factors are constrained by the relevant engineering geological conditions for the improvement of composite foundation bearing capacity,which shows that the area replacement rate of the foundation is improved.The effective way of bearing capacity of composite foundation,the increase of area replacement rate is usually achieved by adjusting the pile spacing to make the pile base densely arranged.There is such a problem in the area replacement rate in the 0K lateral composite foundation: the center distance of the friction pile should not be less than 3.0 times the diameter of the pile body.Therefore,there is a certain constraint on the improvement of the bearing capacity of the 0K lateral composite foundation.The reason is that there is no condition for generating high surrounding pressure in the 0K lateral composite foundation,and the foundation soil cannot fully exert its bearing characteristics.In the lateral limited subgrade,due to the side effect of the confinement body,the foundation soil only has a path to continue to consolidate,and there is no condition of shear failure,so the lateral limited subgrade can provide a higher bearing capacity,and there is a principle.Advanced,simple process and economical features.Under the condition of confinement,the influence of area replacement rate on its bearing capacity and related factors is worth exploring.In this paper,seven sets of lateral limited subgrades with different displacement rates are tested in the indoor model.The influence of the change of the area replacement rate on the bearing capacity of the lateral limited subgrade,the axial strain of the confined body,and the transverse strain of the confined body are analyzed.On the basis of the indoor model test,the detailed analysis of the lateral limited subgrade project is carried out,and the data of lateral deformation and stress ratio of the lateral limited subgrade are monitored by the large static load test.The monitoring conclusions of the engineering examples are compared with the conclusions related to the indoor model test with lateral limited subgrades,and the results of the indoor model tests are verified from the perspective of engineering examples.The main results achieved through the Institute are as follows:(1)Through the indoor model test of the lateral limited subgrade with different displacement rates,the settlement of the lateral limited subgrade in the upper stepwise loading process,the settlement capacity,the bearing capacity,the axial strain of the lateral body under the different area replacement conditions,The distribution of lateral strain of the lateral body and its development and change law.(2)Through the strain distribution of the confined body during the indoor model test,the axial stress,lateral stress,the ratio of the bounded body and the soil stress of the lateral limited subgrade with different area replacement ratios are studied to find the replacement rate.Improve the influence of axial stress,lateral stress and stress ratio on the lateral limited subgrade.(3)Through large static load test,the data such as lateral deformation and stress ratio of the lateral limited subgrade engineering examples are monitored,and the results of the indoor model test are verified from the engineering example.