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Experimental Study on the Working Characteristics about Two-Pile Composite Foundation

Author: XueJianCheng
Tutor: LuoShuXue
School: Southwest Jiaotong University
Course: Geotechnical Engineering
Keywords: Composite pile foundation PILES Carrying capacity Settlement Finite Element Analysis
CLC: U213.15
Type: Master's thesis
Year: 2010
Downloads: 60
Quote: 2
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Abstract


China has a vast and widely distributed soft ground, more adverse geological conditions. In order to meet the requirements of the foundation strength, deformation and seismic, modern high-speed railway soft foundation treatment in most cases, the CFG pile reinforcement. Therefore, it is necessary to the analysis of the main factors affecting the settlement as well as the mechanism of CFG pile composite foundation work. Double-pile composite foundation pile plate structure is still in the experimental stage, its theoretical research are still lagging behind in practice, and also the need for further research and development. This thesis is based Tuoha Passenger Line research projects DK217 241.66-DK219 500-new Yingkou station test section using CFG pile and cement mixing pile staggered triangular arrangement of reinforcement soft ground. In order to play a better role in guiding the engineering practice, to provide a reasonable range for this type of composite foundation pile plate structure double-pile composite foundation work features the following aspects of the study: 1. Pile soil stress than is key to the design of composite foundation and composite modulus, This paper systematically analyzed the existing composite foundation impact parameter PILES, the calculation method of the composite modulus composite foundation bearing capacity and settlement design calculation method. The composite foundation site test is based on a brief test points roadbed design the form and arrangement of test cross-section components. Lists the main test results, pile-soil stress, the pressure of the deep soil pile stress, strain and subsidence of the test results analysis and comparison of obtained the pile board structure double-pile composite foundation pile soil interaction law, validate and enrich the current CFG pile composite foundation theory. 3. Pile of long rigid pile and flexible short-pile composite foundation design layout under construction conditions PLAXIS finite element software for numerical simulation. And by comparison with the test results of field trials confirmed the correctness and rationality of the numerical simulation. 4 Gang, soft pile staggered arrangement of double pile composite foundation of CFG pile length MIP (cement mixing pile) pile length, pile spacing, the thickness of the reinforced concrete slab, the thickness of the cushion changes using PLAXIS finite element method The stress of composite foundation settlement and deformation characteristics were compared, summed up the power transmission characteristics of Goju pile portfolio foundation of rigid pile and flexible pile, to draw rigid pile and flexible pile length, thickness and mattress of reinforced concrete reasonable cushion thickness range. Reasonable range of these parameters is rigid in the actual project long pile with flexible short-pile composite foundation settlement control optimization design reference.

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CLC: > Transportation > Rail transport > Railway Line Project > Line constructed > Subgrade > Subgrade reinforcement and protection
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