|Table of Contents|

Water migration characteristics of highway subgrade in seasonal frozen areas considering fine particle content(PDF)

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

Issue:
2024年4期
Page:
27-37
Research Field:
道路工程
Publishing date:

Info

Title:
Water migration characteristics of highway subgrade in seasonal frozen areas considering fine particle content
Author(s):
LIU Hong-ping1;  LI Hao2;  WEI Jin3;  BIAN Hai-ding3
(1. Engineering Design and Research Academy, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Chongqing Communications Constructiong(Group)Co. Ltd, Chongqing 401120, China; 3. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
road engineering;  subgrade soil;  laboratory test;  water migration characteristics;  fine particle content;  migration potential
PACS:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2024.04.003
Abstract:
The phenomenon of frost heaving and frost boiling on highways in seasonal frozen areas is severe, and diseases such as frost heaving and frost boiling are mainly caused by the migration of water in the subgrade soil. In order to explore the relationship between water migration characteristics and fine particle content(mass fractions, the same below)in subgrade soil in seasonal frozen areas, based on the reconstruction and expansion project of the Gongjue to Mangkang Highway in Xizang, water migration tests for non-frozen and frozen subgrade soil were designed, the influence of fine particle content on the characteristics of capillary water rise height, temperature gradient, and inflow flux were studied, and a modified model for migration potential and fine particle content was established. The results show that when keeping initial water content and dry density constant, with the increase of fine particle content, the capillary water rise height and inflow flux both increase linearly, and the temperature gradient increases in a curve. As fine particle content decreases, the total inflow of frozen soil changes from an arch shape to a slight S-shape with time, and the inflow flux changes from a decreasing shape to a peak shape with time. Considering the influence of matrix potential on inflow flux, a modified model for water migration potential and fine particle content of subgrade soil in seasonally frozen areas is established. It is found that the migration potential first increases and then decreases with the increase of fine particle content. Comparing with the migration potential model without considering matrix potential, the calculated values and peak point of the migration potential modified model are smaller, resulting in relatively safe. The minimum filling height of embankments with a fine particle content of less than 22% should be controlled above 1.5 m.2 tabs, 16 figs, 27 refs.

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Last Update: 2024-07-10