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| AN ELASTOPLASTIC MODEL FOR SAND CONSIDERING DISTURBANCE |
| (1. Institute of Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Key Laboratory of Soft Soils and Geoenvironmental Engineering，Ministry of Education，Zhejiang University，Hangzhou，Zhejiang 310058，China；3. Xi?an Second Municipal Engineering Company，Xi?an，Shaanxi 710054，China) |
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Abstract The relative density Dr，which has a dramatic change before and after loading during construction，is a major factor for the strength-deformation property of sands. However，the effect of Dr was not taken into consideration in most elastoplastic models. To solve this problem，a new elastoplastic model，the SMP-Lade model，was established by considering the Lade-Duncan model and SMP criterion. Then，based on triaxial consolidated-drained tests data on ISO standard sands of China，the sensibility of the model parameter to Dr was analyzed. Furthermore，based on the disturbed state concept(DSC)，the general disturbance function(D) was established. The disturbance parameter could be deduced from the relative density of sands. At last，the elastoplastic model considering disturbance，which could reflect the contribution of disturbance to the strength-deformation property of sands，was proposed through establishing the relationship between parameters K and peak strength(κf －ft) and disturbed degree. Supposing that the material parameters χ and ψ and the parameters of the SMP-Lade model at initial state were given，the stress-strain-volume change relations of sands at randomly disturbed state could be predicted by the proposed model. The test results show that the proposed model can well describe the strength-strain-volume change relations of sands at a given disturbed state.
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Received: 01 July 2010
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2011, Vol. 30 
