Analysis and Microscopic Examination of Roadbed Disease in Seasonal Tundra Area

  • Yuzhuo Wang
Keywords: Seasonal Frozen Soil, Road Base, Disease Analysis, Microscope Inspection, Prevention and Control Measures

Abstract

With the rapid development of China’s economy, the infrastructure construction including railway and highway
has put forward higher requirements. However, under the circumstance of temperature variation, the stress state
of permafrost subgrade in seasonal tundra region is very complicated, and there are many influencing factors.
The problem of frost heave, thaw and subsidence of subgrade in seasonal tundra region has always been a
difficult problem for construction personnel and scientific research workers. The purpose of this paper is to
study the analysis and microscopic examination of roadbed diseases in seasonal tundra area. Based on the
research background of roadbed freezing damage in seasonal tundra region, this paper analyzes the main causes
of roadbed freezing damage from three factors of temperature, soil quality and moisture, and puts forward the
corresponding prevention measures. In the experimental part, soil samples of 224 sections and 221 sections in
typical freeze-damaged sections were taken for indoor freeze-heaving test to study the relationship between
freeze-heaving and temperature, water, salt and compaction degree. In the indoor filling model, the frost heave
model test was carried out to analyze the change rules of temperature, displacement and salinity under the action
of freezing-thawing cycle, and to verify the effect of salt-injection method on freezing damage of roadbed. The
maximum frost heave of ordinary test section is 0.4mm, and the maximum frost heave of salt injection test
section is 0.075mm. After salt injection, the frost heave of roadbed soil decreases by 81.25%, which indicates
that after artificial salinization of roadbed soil, the frost heave of roadbed soil can be effectively inhibited.

Published
2020-02-01