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ѵ131ƪ

Numerical analysis of composite piled raft with cushion subjected to vertical load
dӢZՓȫՈc朽
ע⣺Փ Computers and Geotechnics, 2003, 30(6): 443-453 l
ʹՈעՓij̎

(SCIEI䛱)
Fa-Yun Lianga(l)*, Long-Zhu Chena, Xu-Guang Shib
a.Institute of Disaster Prevention, School of Civil Engineering and Mechanics, Shanghai Jiaotong University, Shanghai 200030, PR China
b.Department of Civil Engineering, Hong Kong University of Science and Technology, Hong Kong, PR China


Abstract:In order to mobilize shallow soil to participate in the interaction of piled raft foundation sufficiently, the authors extended the concept of piled raft to a new type of foundation named composite piled raft. In the system of composite piled raft, the short piles made of flexible materials were used to strengthen the shallow soft soil, while the long piles made of relatively rigid materials were used to reduce the settlements and the cushion beneath the raft was used to redistribute and adjust the stress ratio of piles to subsoil. Finite element method was applied to study the behavior of this new type of foundation subjected to vertical load. Influencing factors, which include ratio of length to diameter and elastic moduli of piles as well as thickness and elastic modulus of cushion, were studied in details. Load-sharing ratios of piles and subsoil as well as foundation settlement were also investigated in this paper. The conclusions had been successfully applied to some practical buildings in the coastal cities of China. The validity of the numerical results was examined through a seven-story building observed in situ.
Keywords: Piles; Raft; Foundation; Analysis


ѵ132ƪ

׃ܛTrescaДU׆}䑪
dՓȫՈc朽
ע⣺ՓڡrW2004, 25(2): 261-265l
ʹՈעՓij̎

(EI䛱)
l,
ϺͨWWԺ ȫcĹоϺ200030

ժҪ ժ ҪҎԇɹrϵļÛs͑׃ܛMкÏՓweƽԭƌ ׃ܛTresca ДU׆}һ˲ˮU׆}ҎQTDЧȹ̆}һđÃrֵ
PI~ Û׃ܛTresca ʄtUܛճ
ЈD̖TU 473


Analytical solution to cavity expansion in strain-softening soils with Tesca yield criterion and its applications

LIANG Fa-yun, CHEN Long-zhu
Institute of Disaster Prevention, School of Civil Engineering and Mechanics, Shanghai Jiaotong University, Shanghai 200030, China


Abstract: Based on conventional experiment results, a simplified constitutive model is given to simulate the strain-softening and shear dilating characters of soils. By using elastoplastic theory and volume-balance equation, an analytical solution to cavity expansion of saturated clays is established with Tresca yield criterion. The regularities of cavity expansion in saturated clays are analyzed under undrained condition. The results have practical significances for analyzing engineering problems such as static piling in clays.
Key words: shear dilation; strain-softening; Tresca yield criterion; cavity expansion; saturated clays


ѵ133ƪ

ӽЧȺ໥ϵӰ
dՓȫՈc朽
ע⣺ՓڡrW2005, 26(11): 1757-1761l
ʹՈעՓij̎

(EI䛱)
l12R1
(1. ͬW ½cϵϺ 2000922. ϺͨW ľϵϺ 200030)

ժҪȺ໥ϵͨDzƽ摪׃ģMзо^Ľ?ԍΪѼЙ׮ģ?Ⱥ໥õķeַ̽ԃɘ໥õĻģ͞оӽЧȺ໥õӰcՓMylonakis & Gazetas ČȱӽЧȺ໥ϵ^@ӰָMylonakis & GazetasڼλƷýдڵһЩҪ}
PI~ӽЧȺeַ໥ϵ
ЈD̖TU 473 īIRaA

Analysis of piles reinforced effects on interaction coefficients of piles

LIANG Fa-yun1, CHEN Long-zhu2, LI Jing-pei1
1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
2. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, China


Abstract:The interaction coefficients of pile group were usually analyzed with plane strain model, which had too many assumptions. Based on a more rigorous model of imaginary piles, integral equation approach for piles group interaction was applied to analyze the effects of piles reinforcement in soil. To simplify the analysis, two piles model was given. Compared with the elastic theory method and Mylonakis & Gazetas method, it shows that the effects of piles reinforcement in soil had obvious influence on the interaction coefficients of pile group. Finally, some defects of Mylonakis & Gazetas method based on the shear force-displacement model are pointed out.
Key words: piles reinforced effects; pile group; integral equation; interaction coefficients


ѵ134ƪ

ӠػІΘԠķeַ̽ⷨ䅢о
dՓȫՈc朽
ע⣺ՓڡͬWW, 2006, 34(9): 1159-1165l
ʹՈעՓij̎

(EI䛱)
l1 ,R1 ,2
(1. ͬW½cϵ,??00092 ; 2. ϺͨWľϵ,??00030)

ժҪ÷e׃Q͂fꇷõԌӠػSQ}Ļ,̓Mģ,ƌӠػІΘĵڶFredholm eַ,MДֵӋ. ˌӠػІΘӋ,Øc̎SλƵҪԠ. c䏗Խ,Փ^,m÷YҲS. 鿼ػɌԌΘԠӰ,߀׷N͌ӠػеĆΘM˅.
PI~: Θ; Ӡػ; eַ; f;
ЈD̖: TU 472 īIRa: A
¾̖: 0253 - 374X(2006) 09 - 1159 - 07

An Integral Equation Approach and Parametric Analysis for Single Pile in Layered Soil

L IA N G Fayun1 , L I Jingpei1 , CHEN L ongz hu2
(1. Department of Geotechnical Engineering , Tongji University , Shanghai 200092 , China ;
2. Department of Civil Engineering , Shanghai Jiaotong University , Shanghai 200030 , China)


Abstract:ith the intergral t ransformation and t ransfer mat rix method , basic solution of layered soil under symmet ric load was deduced. The analysis model was set up with fictitious pile method , then the Fredholm integral equations of the second kind for single pile was obtained on the basis of the solution of layered soil under circle load. Numerical method was used to solve the equations and the calculating program was written. The axial forces , shear forces and displacement s along pile were obtained. Compared with classical elastic solutions , the present theory is more rigorous and applicable providing more solutions. To investigate the influence of st ratified characters of soil , numerical examples of single pile in representative soil st rata were studied.
Key words :single pile ; layered soil ; integral equation ; t ransfer mat rix ; paramet ric analysis


ѵ135ƪ

ӠػлϘ͏ͺϵػķ
dՓȫՈc朽
ע⣺ՓڡřW, 2007, 29(3): 379-384l
ʹՈעՓij̎

(EI䛱)
l12R1
1.ͬW½cϵϺ 2000922.ϺͨWľϵϺ 200030

ժҪھ|ػлϘ͏ͺϵػeַⷽĻA돗ԌӠՓƌӠػлϘ͏ͺϵػķeַ̽ĶӠػлϘ͏ͺϵػ^Փwϵͨ^ֵӋÉ|˜c̎SλƵҪԠcMЌC˱ķӋ_߀ᘌһ̌Mоwfķ܉mڌH̆}й̑ǰ
PI~ӠػϘͺϵػfԠ
ЈD̖TU472 īIRaA ¾̖1000C4548(2007)03C0379C06

Study on the behavior of composite foundation with hybrid piles in layered soils

LIANG Fa-yun1, CHEN Long-zhu2, LI Jing-pei1
1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, China


Abstract:Based on the analysis of composite foundation with hybrid piles in homogeneous soil, the solutions of composite foundation with hybrid piles in layered soil were deduced by introducing elastic layered medium theory, and then a relatively complete theoretical system to analyze composite foundation with hybrid piles in layered soil was built up. Numerical method was used to solve the integral equations, and the axial forces, shear forces and displacements along piles under the actions of cushion were obtained. Comparison with classical elastic solutions verified the accuracy of the presented method and calculating program. Finally, a practical engineering project was studied to illuminate the applicability of the presented method.
Key words :layered soil; hybrid pile; composite foundation; transfer matrix, working behavior; parametric analysis


ѵ136ƪ

The analysis and regulation for the dynamics of a temperate bacteriophage model
dՓȫՈc朽
ע⣺ՓMathematical Biosciences 209 (2007) 417C450l
ʹՈעՓij̎
Zhipeng Qiu(־i)
Department of Applied Mathematics, Nanjing University of Science and Technology, Nanjing 210094, PR China

Abstract: The purpose of this paper is to study the asymptotical behavior of a temperate bacteriophage model in chemostat, which was first proposed by Levin et al. [B.R. Levin, F.M. Stewart, L. Chao, Resource-limited growth, competition and predation: A model and experiment studies with bacteria and bacteriophage, Am. Nat. 125 (1977) 3]. Firstly, a classification for the equilibria of the model and their stability are obtained; secondly, sufficient conditions for uniform persistence are obtained; thirdly, sufficient conditions for the global asymptotic behavior are given, and simulations for the model are presented. The theoretical results show that there are more than eight cases for the classification of the model, and that the decrease (increase) of the nutrient concentration or average lytic time (flow rate) is beneficial to the survival of the sensitive cells. Both the simulated and theoretical results show that there is a possibility of switch phenomena or a periodical outburst of the phages and the lysogens, which is caused by the internal factors rather than by some external environment. Finally, the simulation and regulation of the dynamics of the model with experimental data are presented.
Keywords--Chemostat; Temperate bacteriophage; Regulation; Coexistence; Competition


ѵ137ƪ

wTlλ財׃Ķλ\
dՓȫՈc朽
ע⣺ՓڡAtWs־No.2 Vol.20 1998 l
ʹՈעՓij̎
R󡡅ƼΡ۸Դܕw¡ǾSAE
ڶ܊tWLtԺ񽛃ȿ,Ϻ,200003

ժҪ̼֫Äñ늘Oӛ䛵wTlλSEPRβλCEλN24M^Ƥӛ䛵P40λּ̽ӑSEPͬμ財׃Mжλ\Rrֵ


ѵ138ƪ

Ä񽛼wTlλԴR
dՓȫՈc朽
ע⣺ՓڡRWs־2002113182-185퓰l
ʹՈעՓij̎
R ܕ w
ڶ܊tWLtԺ񽛃ȿ,Ϻ,200003

ժҪͨ^̼֫Ä,քeضκiμ׵ƤwӛwTlλ(SEP),оTλԴR,һֱRߵҪn},^30Ŭ,SEPо͑кܶMչ,ƝB


 

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