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The Research on Settlement of Two-dimensional Reinforced Composite Foundation

Author: SunJianBing
Tutor: ZhaoMingHua
School: Hunan University
Course: Geotechnical Engineering
Keywords: Composite Foundation Composite modulus Settlement Similarity theory Indoor model test
CLC: TU473.1
Type: Master's thesis
Year: 2009
Downloads: 50
Quote: 1
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Abstract


With the development of China's highway transportation network construction, the highway will inevitably have to go through a lot of soft ground area, and how to deal with the soft subgrade become one of the key issues of the highway construction. With the increasingly prominent issue in soft ground, on soft foundation technology has been booming. The level of discrete material pile reinforced composite foundation on soft foundation technology at home and abroad the rise of a new kind. Theoretical research governance but there are less mature. In this paper, combined with the National High Technology Research and Development Program (863 Program) project \mechanism and so on, more in-depth study by theoretical analysis and model test. Firstly, for the complex modulus of composite foundation is to calculate the key parameters of composite foundation settlement, but solving the fully consistent with the actual exact solution more difficult, in the analysis of the problem based on the existing calculation methods and calculation complex modulus the level of discrete material pile reinforced composite foundation reinforcement as the composite pile and soil, considered as a whole, to avoid a complex interaction mechanism between the pile and the soil, and the minimum potential energy theory of elasticity The principle of minimum complementary energy principle to calculate the composite modulus, invert the upper and lower limits of the composite modulus formula. Second, learn from the results of previous studies based on the level of discrete material pile reinforced composite foundation bearing mechanism of depth, the reinforced body and composite foundation cushion to be considered as a whole sheet, in considering the sheet nonlinear on the basis of the deformation and reinforced body horizontal resistance role, based on the theory of virtual work and Winkler elastic foundation model to establish the level of discrete material pile reinforced COMPOSITE FOUNDATION settlement calculation method. The method can comprehensively reflect the upper load area replacement ratio, cushion and pile soil stiffness and pile soil stress ratio factors. Finally, in order to further study the level of discrete material pile reinforced composite foundation settlement characteristics, designed on the basis of similarity theory and complete: pure soft soil subgrade model test, Gravel Pile soft soil subgrade model test, Geocell broken The soft subgrade model test of Shizhuang processing soft subgrade and geogrid cushion Gravel Pile model test of four groups of laboratory test. The test results show that the level of discrete material pile reinforced composite foundation effective diffusion and homogenization upper load, so as to achieve the reinforced soft ground, reducing the effect of foundation settlement and differential settlement, and can limit the deformation of the embankment outside uplift. , Stone columns and horizontal reinforced cushion together constitute the drainage system, will help speed up the soil between piles drainage consolidation. COMPOSITE FOUNDATION settlement theoretical calculations and model test measured the comparative analysis showed that, both in good agreement, and then verify the rationality and feasibility of the method of theoretical analysis.

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