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BEHAVIOR OF STRIP FOOTING RESTING ON SOFT GROUND STIFFENED BY GRANULAR PILES Scientia Research LibraryJournal of Engineering and Technology Research2348 - 0424201641 Basuony El-Garhy1* and Mohamed Elsawy2 Page No. 1- 12 1 This paper presents a method to analyze strip footing resting on granular layer over soft ground improved by granular piles (i.e., end bearing or floating). The granular layer beneath the strip footing is idealized as incompressible shear layer. The natural weak soil layer is idealized by soft Winkler springs and the granular piles is idealized as stiff Winkler springs. These springs is connected at their heads by a thin membrane under uniform tension to overcome the drawbacks of Winkler model related to the continuum nature of the soil. The finite element method is used to solve the problem under consideration. The granular piles of different lengths, diameters and stiffness can be modeled by the present analysis method. Validation of the proposed analysis method through comparisons with field measurements, predicted results by other analysis method and results of PLAXIS program are investigated. http://www.scientiaresearchlibrary.com/archive-abs.php?arc=401http://www.scientiaresearchlibrary.com/archive/JETR-2016-4-1-102-1-12.pdf

Mud cake simulation shale microcracks Scientia Research LibraryJournal of Engineering and Technology Research2348 - 0424201641 Huang Jinjun, Chen Xinwei*, Xu Ying, Li Ran, Li Chunxia Page No. 13-19 1 Exploration ultra-low permeability mud cake production conditions, using ultra-low permeability mud cake to simulate shale microcracks. Studied the dispersion conditions on permeability of the filter cake，such as bentonite, temperature, stirring speed, stirring time and drilling fluid additions，obtained the variation of the cake permeability，found the closest mud cake production conditions to shale permeability. As can be seen from the experimental data，the permeability of mud cake decreased with the increase of bentonite, stirring speed ，stirring time. Effect of temperature on the permeability of the filter cake is reduced after the first increase, the critical temperature is 20 ℃. Join drilling fluid can significantly reduce the cake permeability. The results show that under the experimental conditions of mud cake permeability between 0.1986 10-6 m2 ~5.7904 10-6m2, show mud cake permeability shale can reach nearly shale level. Key words: Mud cake; Shale; Permeability; Microcracks http://www.scientiaresearchlibrary.com/archive-abs.php?arc=402http://www.scientiaresearchlibrary.com/archive/JETR-2016-4-1-107-13-19.pdf