成样方法对砂土静力三轴固结不排水剪切试验结果的影响  

Influence of Sample-Preparing Methods on Results of Static Tri-axial Consolidation Un-drained Test of Sand

作　　者：郭莹[1,2] 陈珍[2] 

机构地区：[1]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 [2]大连理工大学建设工程学部岩土工程研究所,辽宁大连116024

出　　处：《中国港湾建设》2010年第2期30-34,共5页China Harbour Engineering

基　　金：国家自然科学基金重点基金资助项目(50639010);国家自然科学基金青年基金资助项目(50808033)

摘　　要：利用应变控制式静力三轴剪切仪,对饱和中砂进行了一系列固结不排水剪切试验,着重研究不同成样方法对不同密实程度的砂土静力变形特性的影响。选择的成样方法是实验室内制备试样常用的干装法和湿装法。固结不排水试验结果表明,成样方法对饱和中砂静力三轴试验的结果有着重大的影响,不同的成样方法获得的试验结果需要采用不同的本构模型才能准确描述,应该予以重视;同时得出另外一条重要结论,不同的成样方法对密砂的影响较小,对松砂和中密砂的影响较大。Some consolidation un-drained shear tests were carried out on the saturated medium sand by use of strain-controlled static tri-axial shear apparatus. The effects of different sample preparing methods on static deformation behavior of sand were discussed basically. The methods of specimen sampled were dry-sampling method and moist-sampling method, which were the most common sampling methods in the laboratory. The consolidation un-drained test results shown that, sample-preparing methods had huge impact on the static tri-axial test results of the saturated medium sand. The influences are so apparent that not be ignore since those test results by different sampling methods should be described with different constitutive models. Another important conclusion achieved was that the affects of different sampling methods had varying impact degrees on different relative density sands. Fewer impacts happened on dense sand than loose sand and middling dense sand.

关 键 词：静力三轴试验 固结不排水试验 饱和中砂 干装法 湿装法 

分 类 号：TU411.5[建筑科学—岩土工程]