|Table of Contents|

Deformation characteristics of coarse-grained sulfate saline soil roadbed under multiple working conditions under freeze-thaw cycles(PDF)

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

Issue:
2025年1期
Page:
13-23
Research Field:
道路工程
Publishing date:

Info

Title:
Deformation characteristics of coarse-grained sulfate saline soil roadbed under multiple working conditions under freeze-thaw cycles
Author(s):
LIU Wei1; 2;  YANG Xiao-hua2;  ZHANG Sha-sha2
(1. Department of Architecture and Environmental Engineering, Taiyuan University, Taiyuan 030032,Shanxi, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
road engineering;  coarse-grained sulfate saline soil;  experimental reasearch;  freeze-thaw cycle;  deformation;  closed state;  precipitation;  supply of groundwater and salt
PACS:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2025.01.002
Abstract:
In order to further study the deformation characteristics of coarse-grained sulfate saline soil roadbed underfreeze-thaw cycles, based on actual environmental conditions, deformation model tests were conducted on the roadbedof coarse-grained sulfate saline soil on site under three working conditions, closed state, precipitation, and supply ofgroundwater and salt. Seven freeze-thaw cycles were conducted for each working condition. The variation patterns oftemperature and deformation of the roadbed during freeze-thaw cycles were obtained. Taking into account the changesin moisture and salt content in the roadbeds, the effects of precipitation and supply of groundwater and salt underfreeze-thaw cycles on the deformation of coarse-grained saline soil roadbed were compared and analyzed, and thedeformation rates of the corresponding roadbeds were proposed. The results show that during 7 cycles of freeze-thawcycles, the temperature of the soil at different depths of the coarse-grained sulfate saline soil roadbed under threeworking conditions shows periodic changes, and the larger the depth, the smaller the magnitude of the temperaturechange in the soil. Under closed state and supply of groundwater and salt conditions, the total deformation of theroadbed at the end of the freeze-thaw cycle increases first and then gradually stabilizes with the increase of freeze-thawcycles. However, under precipitation conditions, the total deformation of the roadbed at the end of the freeze-thaw cycleshows a trend of increasing first and then decreasing. The deformation of the roadbed under each test condition ismanifested as the accumulation of salt expansion. The maximum deformation of the roadbed under the three workingconditions of closed state, precipitation, and supply of groundwater and salt are 0.915,12.385, 0.957 mm,respectively. The final total deformation of the roadbed under precipitation conditions is 10.5 times that of the roadbedin a closed state, and the precipitation has a significant impact on the deformation of the coarse-grained saline soilroadbed. The maximum salt expansion deformation of the roadbed during the cycle under two working conditions ofclosed state and supply of groundwater and salt is 0.402 and 0.421 mm, respectively, and the final total deformationof both conditions is 0.603 and 0.611 mm. The influence of supply of groundwater and salt on the deformation ofthe coarse-grained saline soil roadbed is relatively small. The maximum deformation rates of the roadbed under threeworking conditions are 0.153%, 2.064%, and 0.160%, respectively.4 tabs, 11 figs, 31 refs.

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Last Update: 2025-02-25