成样方法对多种土体排水剪切试验结果的影响对比  

Comparison of Effects of Sampling Methods on Drained Shear Test Results of Soils

作　　者：郭莹[1,2] 王海礁[1] 

机构地区：[1]大连理工大学建设工程学部岩土工程研究所,辽宁大连116024 [2]大连理工大学海岸和近海工程国家重点试验室,辽宁大连116024

出　　处：《防灾减灾工程学报》2015年第2期160-165,共6页Journal of Disaster Prevention and Mitigation Engineering

摘　　要：通过利用干、湿2种成样方法制备的松、密状态的细砂、中砂、粉砂和粉土试样的三轴固结排水剪切试验的结果对比,分析了分别采用干装法、湿装法制备的试样试验结果的共性和差异,并对比了其应力应变关系、体变关系、有效应力比等特性。结果表明:4种土体分别采用干装法和湿装法制备试样所获得的试验结果均存在差异,且密实状态下的差异不如疏松状态下的明显。疏松状态下,湿装法试样基本呈现应变硬化和剪缩现象,而干装法试样均呈现应变软化和剪胀现象;密实状态下,干装法试样呈现应变软化和剪胀现象,湿装样试样则呈现应变硬化和剪缩现象。通过对不同土体抗剪强度指标的对比发现,干装法试样的强度指标均大于湿装法试样。By Comparing the tri-axial consolidation drained shear test results of fine sand, medium sand, silty sand, silt samples under loose and dense state prepared by dry method and moist method, the common character and difference of test results of samples of soils made by dry-sam- pling method and moist-sampling method were analyzed. The characteristics of stress and strain relation, volumetric strain and effective stress ratio were contrasted. Comparison shows that [or four kinds of soil, the results obtained from dry method and moist method are different. Differ- ences of loose samples are more obvious than those of dense samples. The loose samples prepared by moist method present strain hardening and contractibility basically, and yet the dry method samples present strain softening and dilatability. The dense samples prepared by dry method show strain softening and dilatability, and yet the moist method samples present strain hardening and contractibility. The study on shear resistance indexes of different soils finds that the strength indexes of dry method samples are larger than those of moist method samples for four kinds of soil.

关 键 词：固结排水剪切试验 成样方法 不同土体 强度指标 

分 类 号：TU411[建筑科学—岩土工程]