Calculation Model for Stress Concentration Ratio of Composite Foundation Reinforced by Geosynthetic-encased Stone Columns

被引：0

作者：

Tan X. ^{[1
]}

Feng L.-J. ^{[1
]}

Zhao M.-H. ^{[1
]}

Jin Y.-X. ^{[1
]}

机构：

[1] School of Civil Engineering, Hunan University, Changsha, 410012, Hunan

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2019年 / 32卷 / 09期

关键词：

Composite foundation; Geosynthetic encasement; Numerical simulation; Road engineering; Stone column; Stress concentration ratio;

D O I：

10.19721/j.cnki.1001-7372.2019.09.004

中图分类号：

学科分类号：

摘要：

Stress concentration ratio is the most important parameter in the settlement calculation of a composite foundation reinforced by geosynthetic-encased stone columns. However, the calculation method of stress concentration ratio has not been well established due to the extremely complicated interactions in the stone column-soil encasement system. In this work, the stress concentration ratio of a composite foundation was calculated using both numerical and analytical methods, taking into account the load-deformation behavior of a composite foundation reinforced by geosynthetic-encased stone columns. A new calculation model for the stress concentration ratio was proposed based on the strain compatibility assumption of the stone column-soil encasement system, and its analytical solution was presented. The proposed model can reflect complicated interactions between the stone column, surrounding soil, geosynthetic encasement, and load. The stress concentration ratio increases with increasing depth, encasement stiffness, replacement ratio, stiffness ratio between the stone column and soil, and friction angle of the stone column under the same load, and decreases with an increase in the load. Therefore, a constant stress concentration ratio is not recommended for use in the settlement analysis of the composite foundation reinforced by geosynthetic-encased stone columns, and a suitable stress concentration ratio should be used taking the load and depth into account. © 2019, Editorial Department of China Journal of Highway and Transport. All right reserved.

引用

页码：42 / 50

页数：8

共 25 条

[1]

Gong X.-N., Generalized Composite Foundation Theory and Engineering Application, Chinese Journal of Geotechnical Engineering, 29, 1, pp. 1-13, (2007)

[2]

Ouyang F., Zhang J.-J., Fu X., Et al., Experimental Analysis of Bearing Behavior of Geosynthetic Encased Stone Columns, Rock and Soil Mechanics, 37, 7, pp. 1929-1936, (2016)

[3]

Zhao M.-H., Chen Q., Zhang L., Et al., Calculation of Bearing Capacity of Geosynthetic-encased Stone Columns, Journal of Highway and Transportation Research and Development, 28, 8, pp. 7-12, (2011)

[4]

He G.-N., The Composite Foundation of Vibro-replacement Stone Column, (2012)

[5]

Brauns J., Die Anfangstraglast Von Schottersaulen Im Bindigen Untergrund, Die Bautechnik, 55, 8, pp. 263-271, (1978)

[6]

Hughe J., Withers N.J., Reinforcing of Soft Cohesive Soils with Stone Columns, Ground Engineering, 7, 3, pp. 42-49, (1974)

[7]

Wong H.Y., Field Instrumentation of Vibroflotation Foundation, Field Instrumentation in Geotechnical Engineering, 23, 4, pp. 475-487, (1974)

[8]

Zhang L., Zhao M.-H., Ma B.-H., Et al., Large Scale Laboratory Experiments on Two-directional Composite Foundation Reinforced with Geocell and Stone Columns, China Journal of Highway and Transport, 26, 6, pp. 1-8, (2013)

[9]

Zhao M.-H., Gu M.-X., Zhang L., Et al., Model Tests on Influence of Vertical Geosynthetic-encasement on Performance of Stone Columns, Chinese Journal of Geotechnical Engineering, 36, 9, pp. 1587-1593, (2013)

[10]

Chen J.-F., Wang B., Wei J., Et al., Model Test of Embankment on Composite Foundation Reinforced with Geosynthetic-encased Stone Columns, China Journal of Highway and Transport, 28, 9, pp. 1-8, (2015)

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