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| ANALYSIS OF DYNAMIC CHANGES OF ANISOTROPIC PERMEABILITY COEFFICIENT WITH VOLUMETRIC STRAIN IN SEEPAGE COUPLING |
| WANG Chunbo1，2，DING Wenqi1，2，LIU Shubin3，WANG Jun3，TANG Zhicheng4 |
(1. Department of Geotechnical Engineering，College of Civil Engineering，Tongji University，Shanghai 200092，China；
2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai，200092，China；3. Wuxi Metro Group Co.，Ltd.，Wuxi，Jiangsu 214131，China；4. School of Civil Engineering and Architecture，Wuhan University，Wuhan，Hubei 430072，China) |
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Abstract Permeability coefficient is a bridge of linking stress field and seepage field. Establishing relationship between permeability coefficient and stress field or seepage field can reflect the influence of stress field on seepage field and achieve real seepage coupling analysis. Based on three-dimensional seepage coupling Boit consolidation theory，the relationship between anisotropic permeability coefficient and volumetric strain is built on the basis of Kozeny-Caman equation，and relevant program is embedded with FISH program in FLAC3D software. Then soil mass unit is assigned dynamic permeability coefficients to reflect the influence of stress field on seepage field，realizing real seepage coupling analysis of stress field and seepage field. A case study of foundation pit is presented for validation. Result shows that permeability coefficient changes with strain field or stress field. The permeability coefficient decreases with negative volumetric strain but increases with positive volumetric strain. The volumetric strain has larger influence on horizontal permeability coefficient than vertical permeability coefficient. It may provide a reference for dynamic seepage coupling analysis of geotechnical engineering.
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Received: 13 August 2013
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2014, Vol. 33 
