Research On Bearing Capacity Characteristics Of Stiff Composite Pile Based On Yunnan Peaty Soil

As a unique soil in Kunming,peat soil has a large content in the area around Dianchi Lake.As a soft soil foundation,peat soil has a larger water content than other foundation soils,which makes the selection of pile foundation a top priority.Strong sexual composite pile as a relatively new type of composite pile type in recent years,is the use of cementsoil pile internal insert the corresponding core pile to combine together,as a whole has a great improvement of performance of,and strength of composite pile in soft soil foundation treatment has a very good effect,but for peaty soil using strength composite pile is very few,It is very important to study the application of reinforced composite pile in peat soil from the perspective of environmental protection,economic benefit and bearing capacity.In this paper,three analysis methods are used to study the bearing performance and stress mechanism of rigid composite pile in peat soil,focusing on the vertical bearing capacity characteristics of core pile under load from the length and section size of core pile.The research results are as follows:(1)By reference to the relevant specifications pile type according to their own research summarizes the corresponding formula for calculating the ultimate bearing capacity under different failure modes,and through the corresponding numerical reference forecast out of the soil core pile,short core pile and steel pipe pile under the vertical load bearing capacity characteristic value,and from the obtained numerical forecast in the indoor model test of pile vertical load force;(2)Some physical indexes of air-dried soil are measured by geotechnical test,and elastic modulus of soil-cement pile is obtained by unconfined compression test,which can provide reference for laboratory model test and finite element simulation.(3)Through the indoor model test,the load-settlement,axial force and lateral friction resistance of the reinforced composite pile with different core pile length and different section size are studied.The variation law of the reinforced composite pile,soil-cement pile and steel pipe pile under different loads is obtained,and the advantages of the reinforced composite pile are obtained through comparison.(4)Midas GTS NX finite element software was used to simulate the test process.It was found that the load transfer of the long core pile was deeper than that of the short core pile for the bottom layer of the pile tip of the composite pile,and the load-settlement values between the two were compared and analyzed.