考虑端部效应影响的非饱和压实土三轴试验研究

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Abstract In the unsaturated compacted soil triaxial tests under controlled suction conditions，the digital image measurement technique is used，with which the strength and deformation behaviours of unsaturated compacted soil can be studied by considering the influence of end effect. The comparison of test results of the overall specimen and 1/3 zone in the middle of specimen under controlled suction reflects that end effect has a little influence on 1/3 zone in the middle of specimen；the test result of this part can better stand for the actual deformation properties of unsaturated soil；and it provides credible test data for the study of unsaturated soil stress-strain relationship. The end effect has great influence on parameters of shear strength formula，when using the double-stress state variable method to analyze the shear strength. The elastoplastic model of Alonso for unsaturated soil is adopted to further analyze the influence of end effect on numerical calculation.

Key words： soil mechanics unsaturated compacted soil suction triaxial test digital image measurement end effect

Received: 19 March 2010

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/I09/1937

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