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Displacement and force analyses of piles in the pile-caisson composite structure under eccentric inclined loading considering different stratum features

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Frontiers of Structural and Civil Engineering 2023年第10期17卷 1517-1534页

作者： Xiaoqing ZHAO Jinchang WANG Panpan GUO Xiaonan GONG Yongle DUAN Research Center of Coastal and Urban Geotechnical Engineering Zhejiang UniversityHangzhou 310058China Institute of Transportation Engineering Zhejiang UniversityHangzhou 310058China College of Civil Engineering Hefei University of TechnologyHefei 230009China China North Industries Norengeo Ltd. Shijiazhuang 050051China

A novel anchorage for long-span suspension bridges,called pile-caisson composite structures,was recently proposed by the authors in an attempt to reduce the construction period and costs.This study aims to investigate the displacement and force behavior of piles in a pile-caisson composite structure under eccentric inclined loading considering different stratum features.To this end,both 1g model tests and three-dimensional numerical simulations were performed.Two groups of 1g model tests were used to validate the finite-element(FE)method.Parametric studies were then performed to investigate the effects of groundwater level,burial depth of the pile-caisson composite structure,and distribution of soil layers on the performance of the pile-caisson composite structure.The numerical analyses indicated that the influence of the groundwater level on the stability of the caisson was much greater than that of the piles.In addition,increasing the burial depth of the pile-caisson composite structure can assist in reducing the displacements and improving the stability of the pile-caisson composite structure.In addition,the distribution of soil layers can significantly affect the stability of the pile-caisson composite structure,especially the soil layer around the caisson.

关键词： composite structure piles foundation suspension bridge 1g model test finite-element analysis

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Physical modelling of pipe piles under oblique pullout loads using transparent soil and particle image velocimetry

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Journal of Central South University 2015年第11期22卷 4329-4336页

作者：曹兆虎刘汉龙孔纲强周航 College of Civil and Transportation Engineering Hohai University Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University

A small-scale physical modelling method was developed to investigate the pile bearing capacity and the soil displacement around the pile using transparent soil and particle image velocimetry(PIV) technique. Transparent sand was made of baked quartz and a pore fluid with a matching refractive index. The physical modelling system consists of a loading system, a laser light, a CCD camera, an optical platform and a computer for image analyzing. A distinctive laser speckle was generated by the interaction between the laser light and transparent soil. Two laser speckle images before and after deformation were used to calculate the soil displacement field using PIV. Two pipe piles with different diameters under oblique pullout loads at angles of 0°, 30°, 45°, 60° and 90° were used in tests. The load-displacement response, oblique pullout ultimate resistances and soil displacement fields were then studied. The test results show that the developed physical modelling method and transparent soil are suitable for pile-soil interaction problems. The soil displacements around the pipe piles will improve the understanding on the capacity of pipe piles under oblique pullout loads.

关键词： pipe piles transparent soil particle image velocim

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Theoretical analysis of a row of piles as passive barriers and an equivalent in-filled trench model

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Journal of Central South University 2015年第5期22卷 1919-1928页

作者：高广运宋健杨峻 Department of Geotechnical Engineering Tongji University Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education(Tongji University) Department of Civil Engineering The University of Hong Kong

A theoretical study on the ground vibration isolation efficiency by a row of piles as passive barrier in a three-dimensional context was presented. The analysis was accomplished with the aid of integral equations governing Rayleigh wave scattering, used to predict the complicated Rayleigh wave field generated by a number of irregular scatters embedded in an elastic half-space. Then, the passive isolation effectiveness of a row of piles for screening Rayleigh wave was studied in detail. The effects of relevant parameters on the screening effectiveness were investigated and analyzed from the perspective of equivalence with in-filled trench. The results show that using a row of rigid piles as wave barrier is more effective than that of flexible ones, and an optimum reduction of vibration can be achieved either by increasing the size of piles or by decreasing the net spacing between the piles. Finally, based on the derived integral equation for Rayleigh wave scattering, the principle of equivalent modeling of the barrier of piles by an in-filled trench is put forward, which simplifies the analysis of vibration isolation by a row of piles.

关键词： Rayleigh wave scattering integral equation piles in-filled trench ground vibration passive isolation equivalence principle

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Response of single piles and pipelines in liquefaction-induced lateral spreads using controlled blasting

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Earthquake Engineering and Engineering Vibration 2002年第2期1卷 181-193页

作者： Scott A.Ashford Teerawut Juirnarongrit Department of Structural Engineering University of CaliforniaSan DiegoLa JollaCA 92093-0085

Two full-scale experiments using controlled blasting were conducted in the Port of Tokachi on Hokkaido Island, Japan,to assess the behavior of piles and pipelines subjected to lateral spreading.Test specimens were extensively instrumented with strain gauges to measure the distribution of moment during lateral spreading.This allowed us to compute the loading condition,as well as to conduct damage and performance assessments on the piles and pipelines.This paper presents the test results and discussions on the response of single piles and pipelines observed from the full-scale experiments.Based on the test results,it can be concluded that using controlled blasting successfully liquefied the soil,and subsequently induced lateral spreading.The movements of the single pile,as well as the transverse pipelines,were approximately the same as the free field soil movement.Observed moment distribution of the single pile indicated that global translation of the liquefied soil layer provided insignificant force to the pile.In addition,the degree of fixity at the pile tip significantly affected the moment along the pile as well as the pile head displacement.The pile with a higher degree of fixity at the pile tip had smaller pile head displacement but larger maximum moment.

关键词： piles pipelines pile tests lateral spreading liquefaction soil-pile interaction

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RESEARCH ON PROTECTION OF STEEL piles OF BAOSHAN GENERAL STEEL FACTORY WHARF BY USING DZ AND DZ-2 TAPES

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Chinese Journal of Oceanology and Limnology 1989年第4期7卷 355-359,387页

作者：戴钟道倪湘毓夏庚美袁理 Institute of Oceanology Academia Sinica Qingdao Baoshan General Steel Factory Shanghai

Steel piles at the tidal zone can be seriously corroded. Common protective methods such as painting or coating with rubber or other protective materials, etc. cannot provide full protection when used as supplementary protection because these traditional methods require strict pretreatment and sealing of the metallic surface from the corrosive mediums.and time for the protective coatings to solidify. This is very difficult under the severe action of waves and surges on the sea.With our oil-soluble DZ-2 tape, protection efficiency for hanging steel plates at the tidal and splash zones reaches to 82-99%. The protection efficiency of water soluble DZ tape at the tidal zone reaches to 92.9%. The DZ and DZ-2 tapes can rapidly reduce the original corrosion velocity to ten percent and one percent respectively as fully proved by the 500 hour rapid corrosion testing with indoor salt fog and by the relevant electrochemical parameters of instantaneous corrosion velocity,etc.DZ tape absorbs much OH- to cause a pH

关键词： tidal hanging protective pretreatment painting seriously rubber sealing metallic piles

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piles

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铁道建筑 1986年第8期 37-38页

作者：陈樾荫上海铁路局

piles are structural members of timber,comcrete,and /or steel,used to transmit surface loads o lower levels in the soil mass.

关键词： timber transmit piles stratum 介词短语 basement seldom piles 桩尖 floating

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Stability analysis of free surface of soil between piles in fabricated recyclable foundation pit supporting structure

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Yantu Lixue/Rock and Soil Mechanics 2020年 41卷 299-305页

作者： Chen, Li-Chao Lin, Pei-Yuan Guo, Cheng-Chao Wang, Fu-Ming School of Civil Engineering Sun Yat-sen University Guangzhou 510275 China Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) Zhuhai 519080 China Guangdong Provincial Key Laboratory of Oceanic Civil Engineering Sun Yat-sen University Guangzhou 510275 China Guangdong Provincial Research Center for Underground Space Exploitation Technology Guangzhou 510275 China

The stability of the free surface of the soil between the piles is of great significance for the engineering application of the assembled recyclable foundation pit support structure. In this paper, based on the calculation model of wedge-shaped body and the Terzaghi's theory on loosening earth pressure, considering the interaction between the soil and the pile-slab, the calculation formula of the ultimate supporting pressure of the free surface of the soil between the piles is derived from the limit equilibrium condition of the sliding mass. The calculated ultimate supporting pressure is compared with the numerical simulation results of three-dimensional finite element limit analysis to verify the rationality of the calculation method. The simple variable method was used to analyze the effects of soil internal friction angle φ, interface friction angle between soil and plates/piles δ, ground overload P0, spacing between piles B, relative excavation depth H/D, and unloading arch angle β on the ultimate support pressure. The research results can provide a theoretical basis for the soil support between the piles in the pile-slab support structure. © 2020, Science Press. All right reserved.

关键词： piles

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Research on bearing characteristics of three-stage stepped rock-socketed piles

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Yantu Lixue/Rock and Soil Mechanics 2020年 41卷 39-46页

作者： Li, Dan Jian, Di Wu, Zhuo-Er Zhu, Jun-Hua School of Urban Construction Wuhan University of Science and Technology Wuhan 430065 China

In order to study the deformation and bearing characteristics of rock-socketed single piles with multi-stage variable-section under lateral and vertical static loads, three-stage stepped variable section piles were taken as the research object, experimental studies on the deformation and bearing characteristics of single pile with variable cross section were carried out under lateral and vertical static loading, respectively, three types of model piles with different upper variable diameter ratios and three types of rock-socketed ratios were selected. Based on the measuring and layout of the dielectric material around the pile, various internal force and deformation data of the pile foundation under the action of graded load were monitored and analyzed. The results show that the ratio of the upper variable diameter of rock-socketed pile with three-stage variable-section under the action of horizontal load has a key influence on the resistance to the horizontal displacement of the pile body and the distribution of bending moment of the pile body. As the diameter of the upper pile increases, the bending moment value in the range of upper pile continues to increase, while the bending moment of the rock-socketed section decreases. Moreover, a variable cross-section pile foundation layered model considering the change of pile diameter and soil layer was established and a theoretical calculation formula of pile internal force and deformation was consequently derived, the predicted results based on the theoretical calculation formula were validated by the test results. Under vertical load, the rock-socketed ratio rock-socketed pile with three-stage variable-section has a more significant effect on the distribution of the axial force of the pile body. With the increase of the depth of the rock-embedded pile, the axial force of the pile has a tendency of downward transfer. © 2020, Science Press. All right reserved.

关键词： piles

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Comparative experiments on bearing behavior of different types of pipe piles in sand

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Yantu Lixue/Rock and Soil Mechanics 2020年 41卷 229-236 and 255页

作者： Tang, Meng-Xiong Hu, He-Song Liu, Chun-Lin Yue, Yun-Peng Hou, Zhen-Kun Chen, Hang Guangzhou Institute of Building Science Co. Ltd. Guangzhou 510440 China School of Civil Engineering and Transportation South China University of Technology Guangzhou 510641 China School of Civil Engineering Guangzhou University Guangzhou 510006 China

The vertical bearing capacity of pipe pile foundation with different pile-forming techniques in sand stratum is studied by laboratory model test. The differences in bearing behavior and load transfer mechanism among traditional hammering pipe pile, inner-digging pipe pile and the cased pipe pile while drilling are compared and analyzed, and the effect of core-grouting of pipe pile on the bearing capacity of the drilling with cased pipe pile is discussed. The model test results show that the single pile ultimate bearing capacity of the cased pipe piles while drilling is 19% higher than that of the inner-digging pipe piles in the sand soil layer. The traditional hammering pipe pile in this model test has the smallest ultimate bearing capacity due to a small squeezing effect around the pile shaft. The effect of grouting around the pile shaft is better than that of the squeezing effect in improving the pile side friction. The cement-soil expansion head at the end of the pipe pile in the middle digging pipe pile has an enhanced effect on the lateral friction resistance. Under the same condition of grouting at the pile side, the core filling of pile is beneficial in increasing the ultimate bearing capacity and side friction of the pipe pile while drilling. All these three types of pipe pile foundations are end-bearing friction piles. The pile tip resistance ratio of the inner-digging pipe pile and the cased pipe pile while drilling is about 29% under the ultimate state, which is closer to the full-scale high strain dynamic tests in the field with the pile diameter of 1 m and the pile length of 15 m. © 2020, Science Press. All right reserved.

关键词： piles

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Flexure-Compression Testing of Bridge Timber piles Retrofitted with Fiber Reinforced Polymers

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Open Journal of Civil Engineering 2012年第3期2卷 115-124页

作者： Pablo Caiza Moochul Shin Bassem Andrawes Department of Civil and Environmental Engineering University of Illinois at Urbana-Champaign Urbana U.S.A.

The adequacy of using Fiber Reinforced Polymer (FRP) retrofit technique to restore the flexure-compression behavior of deteriorated bridge timber piles is examined experimentally in this paper. Sixteen specimens are tested monotonically under eccentric compressive loading. The specimens are first tested in their unretrofitted condition to determine their elastic properties. Each specimen is then cut and connected (posted) using the proposed FRP retrofit technique, and retested. The results show that the retrofitted specimens are capable of reaching same or higher strengths than that of the unretrofitted specimens with minimal reduction in their stiffness. Based on the experimental results, a design equation is presented to compute the volumetric ratio of FRP needed for retrofitting bridge timber piles under eccentric load.

关键词： Bridges Timber piles Eccentric Loading Fiber-Reinforced Polymer (FRP)

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