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Lateral displacement of soft ground under vacuum pressure and surcharge load

Frontiers of Structural and Civil Engineering 2011年第2期5卷 239-248页

作者： Chin-Yee ONG Jin-Chun CHAI Department of Civil Engineering and Architecture Saga UniversitySaga 840-8502Japan

surcharge load(*** fill)will induce settlement and outward lateral displacement,while vacuum pressure will induce settlement and inward lateral displacement of a ***,combination of surcharge load and vacuum pressure can reduce or minimize the lateral *** large scale model(length:1.50 m,width:~0.62 m,height:0.85 m)tests and finite element analyses(FEA)were conducted to investigate the main influencing factors on lateral displacement of a soft clayey ground under the combination of vacuum pressure and surcharge *** the conditions investigated,the results indicate that the outward lateral displacement increases with the increase of the ratio of surcharge load to vacuum pressure(RL)and the loading rate of the surcharge load(LR).Also,it is shown that for a given RL and LR condition,lateral displacement reduces with the increase of the initial undrained shear strength(Su)of the *** predict the lateral displacement of a ground under the combination of surcharge load and vacuum pressure,the loading conditions in terms of RL and LR,and Su value of the ground have to be considered.

关键词： vacuum consolidation lateral displacement PVD finite element analysis surcharge load

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Time-dependent deviation of bridge pile foundations caused by adjacent large-area surcharge loads in soft soils and its preventive measures

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Frontiers of Structural and Civil Engineering 2024年第2期18卷 184-201页

作者： Shuanglong LI Limin WEI Jingtai NIU Zhiping DENG Bangbin WU Wuwen QIAN Feifei HE School of Hydraulic Engineering Nanchang Institute of TechnologyNanchang 330099China School of Civil Engineering Central South UniversityChangsha 410075China

Time-dependent characteristics(TDCs)have been neglected in most previous studies investigating the deviation mechanisms of bridge pile foundations and evaluating the effectiveness of preventive *** this study,the stress-strain-time characteristics of soft soils were illustrated by consolidation-creep tests based on a typical engineering *** extended Koppejan model was developed and then embedded in a finite element(FE)model via a user-material subroutine(UMAT).Based on the validated FE model,the time-dependent deformation mechanism of the pile foundation was revealed,and the preventive effect of applying micropiles and stress-release holes to control the deviation was *** results show that the calculated maximum lateral displacement of the cap differs from the measured one by 6.5%,indicating that the derived extended Koppejan model reproduced the deviation process of the bridge cap-pile foundation with *** additional load acting on the pile side caused by soil lateral deformation was mainly concentrated within the soft soil layer and increased with the increase in load *** with t=3 d(where t is surcharge time),the maximum lateral additional pressure acting on Pile 2#increased by approximately 47.0%at t=224 *** bridge pile foundation deviation in deep soft soils,stress-release holes can provide better prevention compared to micropiles and are therefore recommended.

关键词： bridge pile foundation surcharge load soft soil time-dependent deformation interaction mechanism preventive measure

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Finite element analysis of effect of soil displacement on bearing capacity of single friction pile

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Journal of Central South University 2014年第5期21卷 2051-2058页

作者：王丽郑刚欧若楠 School of Civil and Safety Engineering Dalian Jiaotong University Key Laboratory of Coast Civil Structure Safety of Ministry of Education(Tianjin University) Honors School Harbin Institute of Technology

Effect of soil displacement on friction single pile in the cases of tunneling,surcharge load and uniform soil movement was discussed in details with finite element *** displacement of the pile caused by soil displacement reached about 90% of the total displacement,which means that P-Δ effect of axial load can be *** maximum moment of pile decreased from 159 kN·m to 133 kN·m in the case of surcharge load when the axial load increased from 0 to the ultimate *** deformation of pile caused by soil displacement is large,axial load applied on pile-head plays the role of reducing the maximum bending moment in concrete pile to some *** pile is on one side of the tunnel,soil displacements around the pile are all alike,which means that the soil pressures around the pile do not decrease during ***,Q-s curve of the pile affected by tunneling is very close to that of pile in static loading *** capacities of piles influenced by surcharge load and uniform soil movement are 2480 kN and 2630 kN,respectively,which are a little greater than that of the pile in static loading test(2400 kN).Soil pressures along pile increase due to surcharge load and uniform soil movement,and so do the shaft resistances along pile,as a result,when rebars in concrete piles are enough,bearing capacity of pile affected by soil displacement increases compared with that of pile in static loading test.

关键词： tunneling surcharge load uniform soil movement friction pile bearing capacity

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Finite element analysis of couple effect of soil displacement and axial load on single inclined pile

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Journal of Central South University 2014年第9期21卷 3656-3664页

作者：王丽郑刚欧若楠 School of Civil and Safety Engineering Dalian Jiaotong University Key Laboratory of Coast Civil Structure Safety of Ministry of Education (Tianjin University) Honors School Harbin Institute of Technology

The couple effect of soil displacement and axial load on the single inclined pile in cases of surcharge load and uniform soil movement is discussed in detail with the methods of full-scale field tests and finite element method. Parametric analyses including the degree of inclination and the distance between soil and pile are carried out herein. When the displacement of soil on the left side and right side of a pile is identical, deformation of a vertical pile and an inclined pile is highly close in both cases of surcharge load and uniform soil movement. When the couple effect of soil displacement and axial load occurs, settlement of an inclined pile is greater than that of a vertical pile under the same axial load, and bearing capacity of an inclined pile is smaller than that of a vertical pile. This is quite different from the case when the inclined pile is not affected by soil displacement. For inclined piles, P-Δ effect of axial load would lead to a large increase in bending moment, however, for the vertical pile, P-Δ effect of axial load can be neglected. Although the direction of inclination of piles is reverse, deformation of piles caused by uniform soil movement is totally the same. For the inclined piles discussed herein, bending moment(-8 m to-17 m under the ground) relies heavily on uniform soil movement and does not change during the process of applying axial load. When the thickness of soil is less than the pile length, the greater the thickness of soil, the larger the bending moment at lower part of the inclined pile. When the thickness of soil is larger than the pile length, bending moment at lower part of the inclined pile is zero.

关键词： couple effect inclined pile surcharge load uniform soil movement axial load

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