兰州大厚度黄土湿陷系数的影响因素  

Influencing factors of collapsibility coefficient of Lanzhou loess with large thickness

作　　者：胡燕妮[1] 米海珍[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2009年第1期121-124,共4页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(3ZS042-B25-031)

摘　　要：探索兰州地区大厚度黄土物理指标对湿陷系数的影响.通过收集兰州高坪3处10个点的121组原状黄土湿陷性的土工试验资料,分析土粒比重ds、天然重度γ、干重度γd和孔隙比e0对湿陷性的影响,得到黄土湿陷性等级的初始判别指标γd和e0.强烈湿陷性:γd≤12.8 kN/m3,e0≥1.1;中等湿陷性:12.8 kN/m3<γd≤13.4 kN/m3,1.0≤e0<1.1;轻微湿陷性:13.4 kN/m3<γd≤14.1 kN/m3,0.9≤e0<1.0;无湿陷性:γd>14.1 kN/m3,e0<0.9.建议湿陷系数估算公式:sδ=1.47×10-5e7.7e0.The influence of physical property indices of loess with large thickness in Lanzhou area on collapsibility coefficient of the loess was explored. 121 sets of samples of natural loess were collected from 10 spots on three high fluvial terraces of Lanzhou for testing their collapsibility. The influence of specific gravity of solids ds, unit weight γ, dry unit weight γd, and natural void ratio e0 on collapsibility of loess was analyzed and the initial identification indices γd and e0 were obtained for classification of loess collapsibility as follows： γd≤12.8kN/m^3 and e0≥1.1 for high collapsibility; 12.8kN/m^3〈γd≤13.4kN/m^3 and 1.O≤e0〈1.1 for intermediate one; 13.4kN/m^3〈γd≤14.1kN/m^3 and 0.9≤e0〈1.0 for low one; and 28〉14.1kN/m^3 and e0〈0.9 for no-collapsibility. It was suggested that the estimate formula of collapsibility coefficient should be δs=1.47×10^-5e^7.7e0.

关 键 词：黄土 湿陷系数 重度 干重度 天然孔隙比 

分 类 号：TU411.35[建筑科学—岩土工程]