Study on Unventilated-undrained Deformation Behavior ofYunnan Red Cohesive Soil

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Study on Unventilated-undrained Deformation Behavior ofYunnan Red Cohesive Soil

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[1]YANG Song,WU Junhua,LU Tinghao,et al.Study on Unventilated-undrained Deformation Behavior ofYunnan Red Cohesive Soil[J].Journal of Zhengzhou University (Engineering Science),2012,33(05):53-56.[doi:10.3969/j.issn.1671-6833.2012.05.012]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 33 Number of periods: 2012 05 Page number: 53-56 Column: Public date: 2012-09-10

Title:: Study on Unventilated-undrained Deformation Behavior ofYunnan Red Cohesive Soil

Author(s):: YANG Song; WU Junhua; LU Tinghao; etc;; 1.College of Hydraulic and Architeelural Engineering, Yunnan Agricultural University, Kunming 650201, China; 2. College ofCivil Engineering and Architecture, Nanchang Hangkong University, Nanchang 330063, China; 3. Colege of Civil and Trans.portation Engineering, Hohai University, Nanjing 210098, China; 4 Center of Agricultural Education and Experiment, YunnanAgricultumal University,Kunming 650201.China

Keywords:: red cohesive soil; triaxia test; volumetric deformation: dilatation

CLC:: TU446

DOI:: 10.3969/j.issn.1671-6833.2012.05.012

Abstract:: lt is diffeult to measure matric suclion in unsaturated soil, Using saturation as a parameter is valua.ble for unsaturated soil research. A series of improved triaxial compression tests were performed on Yunnan redcohesive soil with different initial saturation degrees and different dry bulk densities. The dilatation occurredfrequently during the tests. When the soil dry bulk density was high, the dilatation of samples with high satu.ration degrees also occurred. The dilatation disappeared when soil dry bulk density was small and saturationdegree was high. The dilatation can be well explained through microscopic mechanism. The dilatation wascaused by lopsided moment and the lopsided moment was caused by pore air pressure. When the soil sampleswith high saturation degrees had small dry bulk densities, the pore air dissolved in the water and the dilatationdisappeared.

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