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⊙第131篇⊙

Numerical analysis of composite piled raft with cushion subjected to vertical load
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注意:本论文已在 Computers and Geotechnics, 2003, 30(6): 443-453 发表
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(SCI和EI收录本文)
Fa-Yun Lianga(梁发云)*, 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


⊙第132篇⊙

应变软化Tresca材料中扩孔问题解答及其应用
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注意:本论文已在《岩土力学》2004, 25(2): 261-265发表
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(EI收录本文)
梁发云, 陈龙珠
(上海交通大学建工学院 安全与防灾工程研究所,上海,200030)

摘要: 摘 要:依据常规试验成果,对岩土材料的剪胀、剪缩和应变软化特性进行简化后,利用弹塑性理论和体积平衡原理,推导 出应变软化Tresca 材料中扩孔问题的一般解答,并分析了不排水饱和土扩孔问题的规律性,对解决诸如沉桩挤土效应等工程问题具有一定的应用价值。
关键词: 剪胀;应变软化;Tresca 屈服准则;扩孔;饱和软粘土
中图分类号:TU 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


⊙第133篇⊙

加筋效应对群桩相互作用系数的影响
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注意:本论文已在《岩土力学》2005, 26(11): 1757-1761发表
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(EI收录本文)
梁发云1,陈龙珠2,李镜培1
(1. 同济大学 地下建筑与工程系,上海 200092;2. 上海交通大学 土木工程系,上海 200030)

摘要:群桩相互作用系数通常是采用平面应变模型进行分析,其研究方法具有较多的近似性。基于更为严格的虚拟桩模型,应用群桩相互作用的积分方程解答,以两桩相互作用的基本模型为例,研究加筋效应对群桩相互作用的影响。与弹性理论法和Mylonakis & Gazetas 解答的对比表明,加筋效应对群桩相互作用系数有着较为明显的影响,并指出Mylonakis & Gazetas基于剪切位移法所得解答中存在的一些主要问题。
关键词:加筋效应;群桩;积分方程;相互作用系数
中图分类号:TU 473 文献标识码:A

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


⊙第134篇⊙

层状地基中单桩性状的积分方程解法及其参数研究
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注意:本论文已在《同济大学学报》, 2006, 34(9): 1159-1165发表
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(EI收录本文)
梁发云1 ,李镜培1 ,陈龙珠2
(1. 同济大学地下建筑与工程系,上海 200092 ; 2. 上海交通大学土木工程系,上海 200030)

摘要:采用积分变换和传递矩阵方法得到弹性层状地基轴对称问题的基本解,按照虚拟桩法建立分析模型,推导出层状地基中单桩求解的第二类Fredholm 积分方程,对其进行数值计算. 编写了层状地基中单桩分析的计算程序,可求得桩身各点处的轴力、剪力和位移等主要性状. 与经典弹性解答相比,本方法在理论上较严密,适用范围和求解结果也更为丰富. 为考察地基土成层性对单桩性状的影响,还对几种典型层状地基中的单桩进行了参数分析.
关键词: 单桩; 层状地基; 积分方程; 传递矩阵; 参数分析
中图分类号: TU 472      文献标识码: A
文章编号: 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
  


⊙第135篇⊙

层状地基中混合桩型复合地基的分析方法
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注意:本论文已在《岩土工程学报》, 2007, 29(3): 379-384发表
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(EI收录本文)
梁发云1,陈龙珠2,李镜培1
(1.同济大学地下建筑与工程系,上海 200092;2.上海交通大学土木工程系,上海 200030)

摘要:在均质地基中混合桩型复合地基积分方程求解方法的基础上,引入弹性层状理论,推导出层状地基中混合桩型复合地基的积分方程解答,从而建立层状地基中混合桩型复合地基较为完整的理论分析体系。通过数值计算,可求得垫层作用下桩身各点处的轴力、剪力和位移等主要工程性状,并与典型算例进行对比,验证了本文方法和计算程序的正确性。最后还针对一个工程实例进行具体分析,说明本文方法能够适用于实际工程问题,具有工程应用前景。
关键词:层状地基;混合桩型;复合地基;传递矩阵;工程性状;参数分析
中图分类号:TU472 文献标识码:A 文章编号:1000–4548(2007)03–0379–06

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


⊙第136篇⊙

The analysis and regulation for the dynamics of a temperate bacteriophage model
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注意:本论文已在Mathematical Biosciences 209 (2007) 417–450发表
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Zhipeng Qiu(邱志鹏)
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


⊙第137篇⊙

腰骶部体感诱发电位对脊髓病变的定位诊断
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注意:本论文已在《中华物理医学杂志》No.2 Vol.20 1998 发表
使用者请注明论文出处
贺斌 吴萍嘉 邵福源 周晖 赵忠新 吴维华 董淑桢
第二军医大学附属长征医院神经内科,上海,200003

摘要:刺激健康成人下肢胫后神经,采用表面电极在腰骶部记录的体感诱发电位(SEP)由马尾电位(CE)和腰骶髓电位(N24)组成。在头皮可记录到P40电位。本文旨在探讨腰骶部SEP对不同节段脊髓病变进行定位诊断的临床价值。


⊙第138篇⊙

胫后神经脊髓体感诱发电位的起源及其临床应用
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注意:本论文已在《临床神经电生理学杂志》2002年11卷3期182-185页发表
使用者请注明论文出处
贺斌 周晖 赵忠新
第二军医大学附属长征医院神经内科,上海,200003

摘要:通过刺激健康成人下肢胫后神经,分别于腰骶段、下胸段和颈段脊髓表面或脊椎皮肤表面记录其体感诱发电位(SEP),研究诸电位的类型、起源和临床应用,一直是临床神经电生理工作者的重要课题,经过30余年的努力,SEP的研究和应用已有很多进展,兹介绍如下。


 

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