|Table of Contents|

Experimental Study on Deformation Characteristics of Existing High-speed Railway Subgrade in Coarse Saline Soil Area(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年02期
Page:
135-142
Research Field:
基础工程
Publishing date:

Info

Title:
Experimental Study on Deformation Characteristics of Existing High-speed Railway Subgrade in Coarse Saline Soil Area
Author(s):
ZHANG Sha-sha1;  LIU Ya-chao1;  YANG Xiao-hua1;  CHEN Wei-zhi2;  JIN Hao-qian1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. China Railway Eryuan Engineering Group Co.Ltd, Chengdu 610031, Sichuan, China)
Keywords:
high-speed railway;  subgrade engineering;  collapse characteristic;  freeze thaw cycle;  model test
PACS:
TU448
DOI:
10.19815/j.jace.2021.04026
Abstract:
In order to explore the deformation characteristics of an existing high-speed railway subgrade, the basic physical and chemical tests of the subgrade filler were carried out, and the basic engineering properties such as particle size distribution, maximum dry density, optimum moisture content and soluble salt content were obtained. Then, the typical subgrade filler was selected to carry out indoor single cooling salt expansion test, collapse test, freeze-thaw cycle test and field large-scale collapse test. The results show that the maximum salt expansion rate of the subgrade soil in a single cooling test is 0.96%. There is a linear relationship between the maximum salt expansion deformation and the soil sample coefficient of uniformity. The final salt expansion of soil sample depends on the grading of soil sample and the content of sulfate ion to a large extent. The maximum collapse coefficient of soil sample under the most unfavorable condition is 0.012, the final collapse of K87+950 section is the largest, which is 5.67 mm, and the maximum deformation rate is 4.7%. The subgrade deformation of K87+950 section presents a V type downward trend with the change of temperature, and the relative thaw settlement reaches the maximum in the fifth freeze-thaw cycle. The sulfate ion presents a M type distribution along the soil sample height after the seventh freeze-thaw cycle.The moisture content at the top of the soil sample near the refrigeration head increases obviously, while the moisture content at the bottom decreases. The moisture content of the soil sample has no obvious change in the height range of 20-40 cm, and the salt expansion deformation is the largest in the range of 15-30 cm from the top of the soil sample. According to the field collapse test, when the water injection amount reaches 30 mm, the collapse amount of K31+000 test point subgrade can reach 80% of the final collapse amount, and extreme rainfall will not cause large collapse deformation of the subgrade.

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Last Update: 2022-03-20