|Table of Contents|

Influence of freezing speed on physical and mechanical properties of freezing-thawing loess(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2013年04期
Page:
16-21
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Influence of freezing speed on physical and mechanical properties of freezing-thawing loess
Author(s):
ZHOU Zhi-jun1;  YANG Hai-feng2;  GENG Nan1;  YE Wan-jun3
1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Shaanxi Provincial Communications Construction Group, Xi'an 710075, Shaanxi, China; 3. School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China
Keywords:
subgrade engineering;  loess;  freezing speed;  dry density;  liquid-plastic limit;  cohesive force;  internal friction angle
PACS:
U416.1
DOI:
-
Abstract:
Freezing speed was set to 3.33, 1.67, 1.11, 0.83 ℃·h-1 respectively, and freezing-thawing cycles were conducted on soil samples with different water contents under closed condition. The water contents, dry densities, liquid-plastic limits, shear strengths and compressibilities of soil samples under different freezing speeds were tested, and the influence rules of freezing speed on the physical and mechanical properties of freezing-thawing loess were analyzed. Test result indicates that the water contents of soil samples after freezing-thawing cycle are larger than those of initial soils, and the growth of water content decreases with the increase of freezing speed. When water contents are lower, the influences of freezing speed on the dry densities of soil samples are less. When water contents are higher, the dry densities of soil samples decrease with the increase of freezing speed. The liquid limits of soil samples increase with the increase of freezing speed, and plastic limits change little. Cohesive force increases with the increase of freezing speed, and the change rule of internal friction angle with freezing speedis closely related with water content. The compressibility of soil sample after freezing-thawing cycle is higher than that of unfrozen soil, and compression modulus increases with the increase of freezing speed. 2 tabs, 13 figs, 15 refs.

References:

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Last Update: 2013-08-30