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Comprehensive tests on rising height of capillary water for coarse grained soil

Global Geology 2013年第1期16卷 54-58页

作者： GUO Qingsong LI Xin LI Min College of Construction Engineering Jilin University Institute for Higher Education Jilin University

According to the comprehensive tests on the rising height of capillary water for seven kinds of differ- ent coarse grained soil by use of the method of standpipe, the relationship between the rising height of capillary water and time was obtained, and the influencing factors and rules were analyzed. The data of the steady rising height of capillary water were obtained, and the regression equation of coarse grained soil on steady height and physical indexes （effective grain dl0 and porosity n） was found. Compared with Hazen＇s and other expressions that could estimate the steady height of capillary water of coarse grained soil, the proposed method is satisfactory and the defects of the latter were pointed out.

关键词： method of standpipe coarse grained soil rising height of capillary water degree of compaction

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Experimental study on permanent deformation characteristics of coarse-grained soil under repeated dynamic loading

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Railway Engineering Science 2021年第1期29卷 94-107页

作者： Huihao Mei Sajjad Satvati Wuming Leng China Railway 11 Bureau Group Co. Ltd.Wuhan 430061China Terracon Consultants IncOmahaNE 68144USA Department of Geotechnical Engineering School of Civil EngineeringCentral South UniversityChangsha 410075China

Practical assessment of subgrade settlement induced by train operation requires developing suitable models capable of describing permanent deformation characteristics of subgrade filling under repeated dynamic *** this paper,repeated load triaxial tests were performed on coarse-grained soil(CGS),and the axial permanent strain of CGS under different confining pressures and dynamic stress amplitudes was *** deformation behaviors of CGS were categorized based on the variation trend of permanent strain rate with accumulated permanent strain and the shakedown theory.A prediction model of permanent deformation considering stress state and number of load cycles was established,and the ranges of parameters for different types of dynamic behaviors were also *** results indicated that the variational trend of permanent strain rate with accumulated permanent strain can be used as a basis for classifying dynamic behaviors of *** stress state(confining pressure and dynamic stress amplitude)has significant effects on the permanent strain *** accumulative characteristics of permanent deformation of CGS with the number of load cycles can be described by a power function,and the model parameters can reflect the influence of confining pressure and dynamic stress *** study’s results could help deepen understanding of the permanent deformation characteristics of CGS.

关键词： Repeated load triaxial tests coarse grained soil Shakedown theory Dynamic stress Accumulated permanent strain Railway subgrade

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