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1035篇 您的检索式:作者名="Fredlund"
    题名 作者 年代 出处 被引量
1非饱和土抗剪强度理论的研究进展显示文摘非饱和土的工程性质是20世纪90年代以来国际岩土工程界研究的热点,非饱和土的抗剪强度是非饱和土的重要工程性质之一,在参阅了中、外文相关资料的基础上,总结了非饱和土抗剪强度理论的研究成果,提出了非饱和土抗剪强度有待进一步研究的问题。陈敬虞 Fredlund D.G. 2003岩土力学2003,24,S2:40
2考虑土体非饱和特性的无限长斜坡降雨入渗解析解显示文摘由降雨诱发的残积土滑坡在亚热带和热带地区非常普遍,产生此类滑坡的主要原因是雨水入渗使斜坡内非饱和土体的负孔隙水压力降低导致了土体抗剪强度的减小。基于二维非饱和渗流控制方程,采用指数函数描述非饱和土体的土水特征曲线及其渗透系数随含水率(或负孔隙水压力)的变化,建立了降雨入渗条件下无限长斜坡内水分运移模型,在合理简化的基础上给出了模型的解析解。通过与成熟的有限元数值模拟软件计算结果的比较与分析,证明该解析解稳定可靠。由该解析解获得的负孔隙水压力剖面可用于评估降雨入渗对非饱和土斜坡稳定性的影响。詹良通 贾官伟 陈云敏 FREDLUND D G 2010岩土工程学报2010,32,8:33
3非饱和土的力学性能与工程应用显示文摘作为一种岩土工程材料,土在非饱和状态下的工程性质与其在饱和状态下是不同的。在过去几十年里,许多学者企图应用饱和土力学的基本理论和原理去解决非饱和土的工程问题。事实证明,没有一种努力是非常成功的。本文从非饱和土中“相”的物理意义和工程性质出发,论述了非饱和土的应力状态变量和体积变化的基本关系式,并应用这种理论分析了膨胀土的体积变化问题和非饱和土的边坡稳定问题。Fredlund D.G. 杨宁 1991岩土工程学报1991,13,5:29
4温度对甜菜种子萌发速率和线粒体活性的影响(英文)显示文摘研究了不同温度对甜菜种子萌发速率和线粒体活性的影响。在 7,14和 2 0℃中甜菜种子萌发 5 0 %需要的时间分别是 7,3和 2 3d ;萌发 5 0 %的热时间大约是 46℃·d。在 7,14和 2 0℃萌发的种子和幼苗的线粒体中 ,总蛋白含量以及细胞色素氧化酶 (CCO)和苹果酸脱氢酶 (MDH)的活性随着萌发进程增加 ;相对分子质量大约为 1880 0 ,35 0 0 0和 36 0 0 0的蛋白质随着萌发进程降低 ;相对分子质量大约为 2 2 0 0 0的蛋白质在 7℃中逐渐增加 ,在 14和 2 0℃中则先少量增加然后下降。 2 0℃中萌发的种子和幼苗的线粒体的CCO和MDH的比活性和总活性比在 7和 14℃中高。这些结果表明 ,萌发温度显著地影响种子的萌发速率、线粒体的CCO和MDH活性以及较小相对分子质量热休克蛋白 2宋松泉 FREDLUND K M MΦLLER I M 2002中山大学学报(自然科学版)2002,41,1:7
5Slope stability hazard management systems显示文摘Weather-related geo-hazards are a major concern for both natural slopes and man-made slopes and embankments. Government agencies and private companies are increasingly required to ensure that there is adequate protection of sloping sur- faces in order that interaction with the climate does not produce instability. Superior theoretical formulations and computer tools are now available to address engineering design issues related to the near ground surface soil-atmospheric interactions. An ex- ample is given in this paper that illustrates the consequences of not paying adequate attention to the hazards of slope stability prior to the construction of a highway in South America. On the other hand, examples are given from Hong Kong and China's Mainland where significant benefits are derived from putting in place a hazard slope stability management system. Some results from a hazard management slope stability study related to the railway system in Canada are also reported. The study took advantage of recent research on unsaturated soil behaviour and applied this information to real-time modelling of climatic conditions. The quantification of the water balance at the ground surface, and subsequent infiltration, is used as the primary tool for hazard level assessment. The suggested hazard model can be applied at either specific high risk locations or in a more general, broad-based manner over large areas. A more thorough understanding of unsaturated soil behaviour as it applies to near ground surface soils, along with the numerical computational power of the computer has made it possible for new approaches to be used in slope hazard management engineering.FREDLUND Delwyn G. 2007Journal of Zhejiang University-Science A(Applied Physics & Engineering)2007,8,11:4
6Protective colostomy in low anterior resection of the rectum using the EEA stapling instrument显示文摘Hans Graffner Per Fredlund Sven-?ke Olsson Jan Oscarson Bengt-G?ran Petersson 1984Diseases of the Colon & Rectum1984,,2:2
7The relationship of the unsaturated soil shear strength function to the soil-water characteristics显示文摘FREDLUND D G XING A FREDLUND M D 1996Canadian Geotechnical Journal1996,33,3:1
8The shear strength of unsaturated soils显示文摘FREDLUND D G MORGENSTERN N R WIDGER R S 1978Canadian Geotechnical Journal1978,15,3:1
9Equations for the soil-water characteristic curve显示文摘Fredlund D G Xing A 1994Canadian Geotechnieal Journal1994,31,:1
10Second canadian geotechnical colloquium:appropriate concepts and technology for unsaturated soils显示文摘Fredlund D G 1979Canadian Geotechnical Journal1979,16,1:1
11Effect of the axis of moment equlibrium in slope stability anlysis显示文摘Fredlund D G Zhang Z M Lam L 1992Canadial Geotechnical Journal1992,29,3:1
12Model for the prediction of shear strength with respect to soil suction显示文摘VANAPALLI S K FREDLUND D G PUFAHL D E 1996Canadian Geotechnical Journal1996,33,:1
13Model for the prediction of shear strength with respect to soil suction显示文摘VANAPALL S K FREDLUND D G PUFAHL D E 1996Can Geotechn J1996,33,3:1
14Equations for the soil-water characteristic curve 显示文摘FREDLUND D G XING A 1994Canadian Geotechnical Journal1994,31,3:1
15The relationship between the soil-water characteristic curve and the unsaturated shear strength of a compacted glacial till显示文摘Vanapalli S Fredlund I)G Pufahl DE 1996Geotechnical Testing Journal1996,,19:1
16The relationship of the unsaturated soil shear to the soil-water characteristic curve显示文摘Fredlund D G Xing A Fredlund M D 1996Canadian Geotechnical Journal1996,33,44:1
17Numerical study of soil conditions under which matric suction can be maintained显示文摘Zhang L L Fredlund D G Zhang L M 2004Canadian Geotechnical Journal2004,41,:1
18The shear strength of unsaturated soils显示文摘FREDLUND D C MORGENSTEM N R WIDGER R A 1978Canadian Geateehnieal Journal1978,15,3:1
19One-dimensional consolidation theory: Unsaturated soils显示文摘FREDLUND D G and HASAN J U 1979Canadian Geotechnical Journal1979,16,3:1
20Stress state variables for unsaturated soils显示文摘Fredlund D G Morgenstem N R 0,,05:1
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