Study On The Design Of Strip Foundation On The Lateral Limited Subgrade

At present,when calculating the internal force of strip foundation,inverted beam method is often used to calculate the bending moment in the direction of short side stress and reinforcement.For the reinforcement in the long side direction,the regulation only uses the construction to reinforce the steel bar,and does not analyze the internal force in the long side direction.The bearing capacity of natural base is low and the settlementis large.When designing strip foundation,the characteristics of deep foundation,wide foundation width and large reinforcement amount will appear.In order to improve these shortcomings of natural base,the lateral limited subgrade can be used to treat the foundation soil,improve the bearing capacity of the foundation,reduce the settlement of the foundation,and achieve shallow burial of wide foundation.The support form of the strip foundation by the lateral limited subgrade is different from that of the natural foundation.The lateral limited subgrade can form multi-point support for the strip foundation,which can reduce the settlement and bending moment of the foundation.It is of great theoretical and economic significance to study the design of strip foundation on lateral limited subgrade.The paramemeters which include the reinforcement,thickness of strip foundation have an impact on the design of strip foundation on lateral limited subgrade.In this paper,the stress principle of strip foundation on lateral limited subgrade is analyzed,and the parameters of reinforcement and strength in strip foundation design are deeply studied.Firstly,the indoor unit tests and analysis are carried out on the lateral limited subgrade and strip foundation,and then the relevant conclusions are verified by engineering examples.The main results are as follows:(1)according to the model test,the settlement change rule of strip foundation with lateral limit body and natural foundation is obtained,and the settlement trend chart is drawn.(2)through model test,the strain variation rule of strip foundation and confined body is obtained when the strength of strip foundation on confined foundation changes.The strain distribution diagram of strip foundation on confined foundation is obtained according to the indoor element model test.(3)according to the model test,the bending moment distribution trend of the long side and short side of the strip foundation on the confined foundation is obtained,and the calculation formula of the bending moment of the long side and short side of the strip foundation on the confined foundation is deduced.(4)based on the engineering example,design the strip foundation on the natural foundation and the confined foundation,compare the foundation on the two kinds of foundation,and prove the correctness of the law of settlement and reinforcement in the test.(5)according to the test results and standard requirements,a design method of strip foundation on confined foundation is proposed.