|Table of Contents|

Test on wetting influence on mechanical characteristics of coarse-grained mixed soil in Xinjiang area(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年03期
Page:
52-64
Research Field:
道路工程
Publishing date:

Info

Title:
Test on wetting influence on mechanical characteristics of coarse-grained mixed soil in Xinjiang area
Author(s):
ZHANG Chong1; 2;  YUAN Sheng-yang1; 2;  TIAN Kai-yuan1; 2;  LIU Jie3;  LIU Xue-jun4; QI Yan-lu5;  LIU Xian-feng1; 2
Keywords:
road engineering;  coarse-grained mixed soil;  test research;  mechanical property
PACS:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2025.03.005
Abstract:
In order to investigate the influence of wetting on the mechanical properties of coarse-grained mixed soil in Xinjiang region, the gravelly soil in Turpan area was taken as the research object, and compaction and triaxial test were carried out on the mixed coarse-grained soil after scaled by equal proportion scaling method. The particle breakage of coarse-grained mixed soil with different moisture contents was analyzed. The effects of wetting on the shear deformation, pore ratio, shear strength and other mechanical indexes of coarse-grained mixed soil were studied. The results show that the particle breakage rate of coarse-grained mixed soil in compaction decreases with the increase of water content, and there is the maximum particle breakage when the natural water content is about 2%. The possibility of breakage decreases significantly after the particle size is less than 5mm. All specimens show the development law of volumetric strain of contraction first and then dilatancy in shear, while the dilatancy gradually decreases with the increase of confining pressure. Due to the lubrication of water film, the dilatancy of the soil after wetting is further reduced. When the confining pressure reaches 150 kPa, the overall volumetric strain of the wetted soil sample at the end of the shear is close to 0. The elastic modulus of the sample increases approximately linearly with the increase of confining pressure, the dilatancy angle decreases significantly, and the Poisson's ratio decreases slightly. After wetting, the elastic modulus of the sample attenuates under different confining pressures, and the attenuation values are similar. The dilatancy angle is further reduced due to water action, but the Poisson's ratio of the soil is less affected by confining pressure and wetting. The cohesion of coarse-grained mixed soil does not change significantly with soil wetting, while the internal friction angle decreases by about 15%. The strength attenuation of soil skeleton after wetting is more due to the fact that water reduces the sliding friction between coarse particles. The research results can provide a reference for further exploring the collapsibility mechanism and constitutive relationship of coarse-grained mixed soil and analyzing the stability of foundation.1 tab, 17 figs, 37 refs.

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Last Update: 2025-05-30