固结过程对冻土应力-应变特性的影响  

Effects of consolidation process on stress strain characters of tjaeles

作　　者：马巍[1] 吴紫汪[1] 常小晓[1] 

机构地区：[1]中科院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000

出　　处：《岩土力学》2000年第3期198-200,221,共4页Rock and Soil Mechanics

基　　金：国家自然科学基金! (49771 0 2 4 );中科院"九五"重点项目!(KZ952 J1 2 1 6)。

摘　　要：选用四种不同固结方式 ,并在 -5℃条件下 ,对冻结砂土样进行三轴压缩试验 ,试验发现固结过程对冻土的强度与变形有明显影响 ,经历 K0 DCF的冻土其强度最大 ,破坏变形最小 ;经历FC的试样强度最小 ,破坏变形最大 ;Through triaxial compressive tests of frozen sandy soils under 4 kinds of different consolidating processes (-5 ℃), it is found that the consolidating process strongly affects the strength and deformation of frozen soils. The frozen soil that is subject to K 0DCF(drainage consolidating and then freezing) has the greatest ultimate strength and the lowest failure strain, on the contrary the frozen soil that is subject to FC (first freezing and then consolidating) has the lowest ultimate strength and the greatest failure strain. For the frozen soil of undergoing the isobaric pressure drainage consolidating and then freezing (EDCF) and the isobaric pressure undrainage consolidating and then freezing (EUCDF), their ultimate strength and failure strain are between those of K 0DCF and FC.

关 键 词：固结过程 冻土 应力-应变特性 

分 类 号：P642.14[天文地球—工程地质学]