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⊙第131篇⊙

Numerical analysis of composite piled raft with cushion subjected to vertical load
下載英語論文全文請點擊上面的鏈接
注意:本論文已在 Computers and Geotechnics, 2003, 30(6): 443-453 發表
使用者請注明論文出處

(SCI和EI收錄本文)
Fa-Yun Lianga(梁發云)*, 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⊙

應變軟化Tresca材料中擴孔問題解答及其應用
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注意:本論文已在《巖土力學》2004, 25(2): 261-265發表
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(EI收錄本文)
梁發云, 陳龍珠
(上海交通大學建工學院 安全與防災工程研究所,上海,200030)

摘要: 摘 要:依據常規試驗成果,對巖土材料的剪脹、剪縮和應變軟化特性進行簡化后,利用彈塑性理論和體積平衡原理,推導 出應變軟化Tresca 材料中擴孔問題的一般解答,并分析了不排水飽和土擴孔問題的規律性,對解決諸如沉樁擠土效應等工程問題具有一定的應用價值。
關鍵詞: 剪脹;應變軟化;Tresca 屈服準則;擴孔;飽和軟粘土
中圖分類號: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⊙

加筋效應對群樁相互作用系數的影響
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注意:本論文已在《巖土力學》2005, 26(11): 1757-1761發表
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(EI收錄本文)
梁發云1,陳龍珠2,李鏡培1
(1. 同濟大學 地下建筑與工程系,上海 200092;2. 上海交通大學 土木工程系,上海 200030)

摘要:群樁相互作用系數通常是采用平面應變模型進行分析,其研究方法具有較多的近似性。基于更為嚴格的虛擬樁模型,應用群樁相互作用的積分方程解答,以兩樁相互作用的基本模型為例,研究加筋效應對群樁相互作用的影響。與彈性理論法和Mylonakis & Gazetas 解答的對比表明,加筋效應對群樁相互作用系數有著較為明顯的影響,并指出Mylonakis & Gazetas基于剪切位移法所得解答中存在的一些主要問題。
關鍵詞:加筋效應;群樁;積分方程;相互作用系數
中圖分類號:TU 473 文獻標識碼: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⊙

層狀地基中單樁性狀的積分方程解法及其參數研究
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注意:本論文已在《同濟大學學報》, 2006, 34(9): 1159-1165發表
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(EI收錄本文)
梁發云1 ,李鏡培1 ,陳龍珠2
(1. 同濟大學地下建筑與工程系,上海 200092 ; 2. 上海交通大學土木工程系,上海 200030)

摘要:采用積分變換和傳遞矩陣方法得到彈性層狀地基軸對稱問題的基本解,按照虛擬樁法建立分析模型,推導出層狀地基中單樁求解的第二類Fredholm 積分方程,對其進行數值計算. 編寫了層狀地基中單樁分析的計算程序,可求得樁身各點處的軸力、剪力和位移等主要性狀. 與經典彈性解答相比,本方法在理論上較嚴密,適用范圍和求解結果也更為豐富. 為考察地基土成層性對單樁性狀的影響,還對幾種典型層狀地基中的單樁進行了參數分析.
關鍵詞: 單樁; 層狀地基; 積分方程; 傳遞矩陣; 參數分析
中圖分類號: TU 472      文獻標識碼: A
文章編號: 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⊙

層狀地基中混合樁型復合地基的分析方法
下載論文全文請點擊上面的鏈接
注意:本論文已在《巖土工程學報》, 2007, 29(3): 379-384發表
使用者請注明論文出處

(EI收錄本文)
梁發云1,陳龍珠2,李鏡培1
(1.同濟大學地下建筑與工程系,上海 200092;2.上海交通大學土木工程系,上海 200030)

摘要:在均質地基中混合樁型復合地基積分方程求解方法的基礎上,引入彈性層狀理論,推導出層狀地基中混合樁型復合地基的積分方程解答,從而建立層狀地基中混合樁型復合地基較為完整的理論分析體系。通過數值計算,可求得墊層作用下樁身各點處的軸力、剪力和位移等主要工程性狀,并與典型算例進行對比,驗證了本文方法和計算程序的正確性。最后還針對一個工程實例進行具體分析,說明本文方法能夠適用于實際工程問題,具有工程應用前景。
關鍵詞:層狀地基;混合樁型;復合地基;傳遞矩陣;工程性狀;參數分析
中圖分類號:TU472 文獻標識碼:A 文章編號: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:本論文已在Mathematical Biosciences 209 (2007) 417–450發表
使用者請注明論文出處
Zhipeng Qiu(邱志鵬)
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⊙

腰骶部體感誘發電位對脊髓病變的定位診斷
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注意:本論文已在《中華物理醫學雜志》No.2 Vol.20 1998 發表
使用者請注明論文出處
賀斌 吳萍嘉 邵福源 周暉 趙忠新 吳維華 董淑楨
第二軍醫大學附屬長征醫院神經內科,上海,200003

摘要:刺激健康成人下肢脛后神經,采用表面電極在腰骶部記錄的體感誘發電位(SEP)由馬尾電位(CE)和腰骶髓電位(N24)組成。在頭皮可記錄到P40電位。本文旨在探討腰骶部SEP對不同節段脊髓病變進行定位診斷的臨床價值。


⊙第138篇⊙

脛后神經脊髓體感誘發電位的起源及其臨床應用
下載論文全文請點擊上面的鏈接
注意:本論文已在《臨床神經電生理學雜志》2002年11卷3期182-185頁發表
使用者請注明論文出處
賀斌 周暉 趙忠新
第二軍醫大學附屬長征醫院神經內科,上海,200003

摘要:通過刺激健康成人下肢脛后神經,分別于腰骶段、下胸段和頸段脊髓表面或脊椎皮膚表面記錄其體感誘發電位(SEP),研究諸電位的類型、起源和臨床應用,一直是臨床神經電生理工作者的重要課題,經過30余年的努力,SEP的研究和應用已有很多進展,茲介紹如下。


 

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