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Field Study and Calculation Analysis of the Influence on Surrounding Soil Due to Vacuum Preloading

Author: AiYingBo
Tutor: ShiJianYong；ChenGui
School: Hohai University
Course: Architecture and Civil Engineering
Keywords: Vacuum preloading Finite Element Deformation of the surrounding soil Pore ??water pressure Crack area The grille like cement mixing pile Churning Pile
CLC: U655.55
Type: Master's thesis
Year: 2006
Downloads: 187
Quote: 2
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Abstract

In this paper, the Guangzhou Nansha Port vacuum preloading reinforcement Reclaimed land soft ground engineering field test study and finite element analysis to carry out vacuum impact on the surrounding environment , field trials focus on three representative test area to carry out vacuum process in the surrounding soil subsidence and horizontal displacement , observed with pumping the vacuum time the changes , combined with the field test of the three test areas , using the finite element program based on Biot's consolidation theory prepared by calculating the results of the field measurement data contrast , validate the calculation method is reasonable to study the changes in the constitutive model parameters to reflect the characteristics of the soil , on this basis , the impact on the the vacuum preloading zone surrounding soil subsidence and horizontal displacement , and gridlike cement mixing pile and cement protective effect of rotating pile analysis . The results show that the vacuum reinforced area surrounding soil distance and depth of the reinforced area soil conditions of the soil , the better the soil conditions of the surrounding soil , and the impact of distance and depth of the smaller ; poorer soil conditions affect the distance and the greater the depth . The soil under the conditions of the test area , the maximum impact distance of more than 50m, affect more than 15m in depth , the for reinforcement outside reinforcement test area , soil conditions , affect the distance of about 15m . Vacuum the impact on the surrounding environment with the pumping the vacuum time the growth gradually weakened , began pumping vacuum within 30 days after the time of settlement and horizontal displacement accounts for more than 80% of the time of the completion of the vacuum . With the characteristics of the soil parameters K , e _{0 < / sub > κ increases , the reinforced area surrounding soil subsidence and horizontal displacement corresponding increase gradually decay with increasing distance . Soil shear strength c , φ improve significantly reduced the scope of crack area , lower surface soil shear strength at the boundary 60m away from the reinforced area are likely to tensile failure appears . Set up to fight rotary jet grouting piles or cement mixing pile wall surrounding soil subsidence and horizontal displacement from the regulation , the soil deformation mainly inside the barrier , greatly reduce the reinforced area around the outside of the soil deformation and reduce the vacuum building tension stress , by contrast , set up to fight the effect of grid-like cement mixing pile a little better than Churning Pile , protective isolation , should try to choose the width grille shaped retaining wall .}

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