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Settlemtnt Calulation and Experimental Study of Rigid-Pile Composite Foundation

Author: HeLaPing
Tutor: ZhaoMingHua
School: Hunan University
Course: Geotechnical Engineering
Keywords: Composite Foundation Rigid pile Settlement calculation Similar principle Model test
CLC: TU473.1
Type: Master's thesis
Year: 2009
Downloads: 54
Quote: 0
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Abstract


Rigid pile composite foundation as an effective means of ground treatment, has been widely in the field of building foundation, roadbed engineering applications and made good engineering benefits. However, its mechanism of action reinforced soft ground, especially soil gravel cushion and rigid piles and piles mutual constraints play mechanism common working mechanism of interaction as well as loads of carrying capacity and deformation mechanism also lack depth research, theoretical research is still in its infancy. In this paper, the National High Technology Research and Development Program (863 Program) project, \conduct more in-depth research. In conclusion, analysis the existing rigid pile composite foundation model test on the basis of the experience, the foundation model test for existing composite rigid pile composite foundation model test, test parameters, select arbitrariness strong lack of similarity theory to guide. In this paper, similar the relevant principles of the theory, dimensional analysis guide similar guidelines had rigid pile composite foundation model test, to determine the key parameters of the model test. According to the symmetry principle demi roadbed analog full-size roadbed form design and selected four groups comparable similarity model test: a simple soft base model test, model test of rigid pile composite foundation Geosynthetic Reinforcement rigid pile composite foundation model test with geocell reinforced cushion rigid pile composite foundation model test. To obtain the ultimate bearing capacity of soft foundation reinforcement around the single pile and pile composite foundation load - settlement curve, the loads pile top and bottom of the pile pile soil stress ratio changes, rigid pile axial force distribution of a large number of valuable test data. Test data analysis and theoretical studies, this paper reveals the geogrid and geocell reinforced cushion to improve shallow soft soil stress distribution, improve the bearing capacity of the soft ground, reducing the working mechanism of the settlement and differential settlement; pointed rigid cushion with rigid piles and soil pile composite foundation system interaction, joint working mechanism and load transfer mechanism. Trial, as well as theoretical studies exist tattooed on deformation under load, the top of the pile, tattooed on the top of the pile deformation makes a certain depth below the surface within the scope of negative skin friction of pile side area, which pile axial stress maximum at longer appears at the top of the pile, but about one-third below the top of the pile pile strengths. Load transfer mechanism of rigid pile composite foundation piles, soil, cushion interaction characteristics of load transfer method, by simplifying the pile-soil unit body vertical relative displacement distribution pattern, the introduction of the elastic-plastic load transfer model, taking into account the pile The tattooed on tattooed under deformation establish rigid pile composite foundation settlement calculation of basic differential equations, and thus can consider a new pile - soil - cushion system together composite foundation settlement calculation method. The calculation method to model the experimental results were analyzed, the settlement in good agreement with the calculated and measured values, and the method of calculation of the workload of the small, convenient to use.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Pile foundation and deep foundation > Pile
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