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Study on Lateral Deformation of Piled for Bridge Abutments under Embankment Overburden on Soft Ground

Author: HuJianRong
Tutor: ZhuXiangRong；WangJinChang；FangPengFei
School: Zhejiang University
Course: Geotechnical Engineering
Keywords: Embankment heap load Passive Piles Free soil displacement field The pile side limit soil pressure Pile-soil relative displacement p-d curve p-y Curve
CLC: U416.1
Type: Master's thesis
Year: 2010
Downloads: 94
Quote: 1
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Abstract


With China's sustained and stable economic growth in recent years, highway construction has entered an unprecedented stage of development. China has a vast, natural and geographical environment, soil vary widely distributed, especially in the rivers and lakes around the soft clay. Construction of roads and bridges connecting section in these places usually takes Roadbed high widened over time when there are larger thickness of soft soil under the roadbed, roadbed soft soil will produce a different level the displacement, the light will abutment pile settlement and deviation, formation of bridgehead common life jumping weight will pile crack bridge deck detachment, resulting in an accident. The horizontal displacement of soil affect pile is usually called passive pile initiative pile much more complex problem than passive pile, therefore carry out passive pile and the surrounding soil interaction research has important significance. The paper first describes the passive the pile and active pile difference, in order to deepen the understanding of passive pile. Summed up the the heap loads passive pile Research, including: a theoretical study, experimental study and finite element numerical simulation. Secondly, based on soil displacement method to calculate the passive PILE several key issues were discussed: pile-soil relative displacement, nonlinear load transfer model, the modulus of subgrade reaction heap load of soil under free displacement field. And limit soil pressure against the pile side specializing in the research, summed up the pile side of the active part and a passive part of the single pile and pile group in cohesive soil, sandy soil limit soil pressure. Pile top free closed-form solution based on Guo (2001), take advantage of the the Ningbo region's two test pile data initially identified the active part of the pile side limit soil pressure for Ningbo area of ??soft soil. ABAQUS finite element software to simulate the passive part of the pile side limit soil pressure. Third, on the basis of passive pile and soil interaction, pile in the sliding surface disposition into passive and active in two parts, piles and surrounding soil interaction through the the pd curve and py curve to simulate, pd, py curve are ideal elastoplastic model, consider the passive portion of the lateral displacement influence coefficient matrix and Pap model and active part of the soil spring correlation between using the difference method elastoplastic solution of soil sliding adjacent pile foundation. Elastoplastic solution with bent single row of piles single pile analysis based on the theoretical derivation. Finally, the background of Wenzhou, a the terminal bridge abutment pile foundation sway piled bridge abutment is analyzed using the proposed method. Problems, the reinforcement measures, using the static load test verified by experiments on reinforcement measures, monitoring data show that after a piled bridge abutment is the horizontal displacement after reinforcement has been effectively controlled, the reinforcement is successful.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Subgrade
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