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Controlling Soil Collapsibility Due to Water Intrusion by rigid foundation System with Reinforced Cushion

Open Journal of Civil Engineering 2021年第4期11卷 451-462页

作者： Naema Ali Ali Faculty of Engineering Pharos University in Alexandria Alexandria Egypt

Since collapsible soils are been mostly transported by wind and deposited in arid or semi-arid regions, they founded in a state of unsaturated condition. In addition, engineering filling when placed in a certain none want density, undesired settlement will be predictable either due to wetting or due to loading on these soil deposits. Collapsibility study is important for the foundation design and construction on these soils. The most foundation systems used on these soils are isolated and strip footing connected with concrete tie beams. Therefore studying rigid foundation system resting on partially saturated collapsible soil/deposits is very important. The present work investigated using rigid strip footing resting in collapsible soils to study the effect of stress interference due to progressive wetting depth from leakage of surface water on collapsibility settlement. The study has been investigated the influence of different behavior of strip footing and inverted T-section strip footing rigidity system resting on unsaturated soil by numerical analysis using the finite element program PLAXIS 2D. The partially saturated collapsible soil is stimulated using the Mohr-Coulomb soil model. The significance parameters are considered two types of footing systems, collapsible soil thickness, use of sand cushion with geo-grid reinforcement at the bottom third of its thickness, and different clear spacing between source of surface water and strip footings on the stress-settlement relationship. The results of this study confirmed that the most important soil parameters in this problem are the use of reinforced sand cushion, decrease applied stress as well as rigid inverted T-section strip footing are more suitable for controlling Soil collapsibility, while the settlement is found to decrease. To avoid

关键词： Collapsible Deposits Hydro-Collapsibility rigid foundation PLAXIS2-D

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THE AXISYMMETRIC MIXED BOUNDARY-VALUE PROBLEM OF THE VERTICAL VIBRATION OF A rigid foundationON SATURATED LAYERED SOIL SUBGRADE

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Applied Mathematics and Mechanics(English Edition) 2002年第2期23卷 218-225页

作者： CHEN Sheng-li(陈胜立) CHEN Long-zhu(陈龙珠) School of Civil and Hydraulic Engineering Tsinghua University Beijing100084 P R China School of Architecture and Civil Engineering Shanghai Jiaotong UniversityShanghai200030 P R China

Based on the theory of elastic wave propagation in saturated soil subgrade established by the author of this paper, the axisymmetric vertical vibration of a rigid circular foundation resting on partially saturated soil subgrade which is composed of a dry elastic layer and it saturated substratum is studied. The analysis relied on the use of integral transform techniques and a pair of dual integral equations governing the vertical vibration of the rigid foundation is listed under the consideration of mixed boundary-value condition. The results tire reduced to the case for saturated half-space. The set of dual integral equations are reduced to a Fredholm integral equation of the second kind and solved by numerical procedures, Numerical examples are given at the end of the paper and plots of the dynamic compliance coefficient C-b versus the dimensionless frequency a(0) are presented.

关键词： partially saturated soil subgrade rigid foundation dynamic compliance coefficient

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Torsional vibrations of a cylindrical foundation embedded in a saturated poroelastic half-space

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Frontiers of Structural and Civil Engineering 2015年第2期9卷 194-202页

作者： Dazhi WU Lu YU School of Civil Engineering and Architecture Zhejiang Sci-Tech University Hangzhou 310018 China

Considering the interactions between an embedded foundation and saturated soil, the torsional vibrations of a cylindrical foundation embedded in a saturated poroelastic medium are analyzed in this paper. Both a rigid foundation and an elastic foundation are considered. Assuming both the side surface and the bottom surface of the foundation are perfectly bonded to soil, the reaction torques that the side soil and bottom soil acting on the foundation can be gained from basic dynamic equations of the poroelastic medium. According to the dynamic equilibrium equations of a foundation under harmonic torque, the torsional vibrations of an embedded cylindrical foundation are presented. Besides, the angular amplitude of the foundation, the equivalent stiffness and damping coefficients of the soil are expressed explicitly. Selected examples are presented to investigate the influence of relevant parameters on the torsional vibrations.

关键词： embedded foundation saturated soil rigid foundation elastic foundation torsional vibration

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A Theoretical Analysis of the Bearing Performance of Vertically Loaded Large-Diameter Pipe Pile Groups

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Journal of Ocean University of China 2016年第1期15卷 57-68页

作者： DING Xuanming ZHANG Ting LI Ping CHENG Ke Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University Chongqing 400045 P. R. China Schoolof Civil Engineering Chongqing University Chongqing 400045 P. R. China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing 210098 P. R. China Schoolof Mechanical and Power Engineering of Nanjing Tech University Nanjing 211816 P. R. China

This paper aims to present a theoretical method to study the bearing performance of vertically loaded large-diameter pipe pile *** interactions between group piles result in different bearing performance of both a single pile and pile *** the pile group effect and the skin friction from both outer and inner soils,an analytical solution is developed to calculate the settlement and axial force in large-diameter pipe pile *** analytical solution was verified by centrifuge and field testing *** extensive parametric analysis was performed to study the bearing performance of the pipe pile *** results reveal that the axial forces in group piles are not the *** larger the distance from central pile,the larger the axial *** axial force in the central pile is the smallest,while that in corner piles is the *** axial force on the top of the corner piles decreases while that in the central pile increases with increasing of pile spacing and decreasing of pile *** axial force in side piles varies little with the variations of pile spacing,pile length,and shear modulus of the soil and is approximately equal to the average load shared by one *** a pile group,the larger the pile length is,the larger the influence radius *** a result,the pile group effect is more apparent for a larger pile *** settlement of pile groups decreases with increasing of the pile number in the group and the shear modulus of the underlying soil.

关键词： pile group effect bearing performance large-diameter pipe pile settlement rigid foundation

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