|Table of Contents|

Stability analysis of high and steep fill snowway roadbed under heavy rainfall condition(PDF)

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

Issue:
2023年03期
Page:
170-179
Research Field:
岩土工程
Publishing date:

Info

Title:
Stability analysis of high and steep fill snowway roadbed under heavy rainfall condition
Author(s):
YANG Lianxiang1; 2;  WENG Xiaolin1; 2;  HU Jibo1; 2;  LEI Shangmin1; 2
(1.School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
heavy rainfall;  roadbed filling;  optimal gradation;  high and steep roadbed;  instability
PACS:
U416.1
DOI:
10.19815/j.jace.2021.11031
Abstract:
In order to study the influence of rainfall infiltration on the stability of roadbed, the finite element model was established based on the engineering background of the high and steep ski jumping platform roadbed of Laiyuan County Winter Olympic Games, considering the factors such as gradation of snow roadbed filler and rainfall intensity. The stability of high and steep fill roadbed under heavy rainfall conditions was analyzed, and the rationality of numerical simulation results was verified by centrifugal test results. The results show that rainfall infiltration will lead to the increase of roadbed displacement, the maximum displacement is 22.401 cm, the pore pressure changes from negative to positive and the maximum relative pore pressure is 85 kPa. As the gradation of roadbed fill tends to be good, the displacement and relative pore pressure of the top surface of the roadbed gradually decrease. With the increase of rainfall time, the displacement and relative pore pressure of the top surface of the roadbed decrease continuously. The displacement decreases from 22.401 cm to 12.35 cm, the relative pore pressure decreases from 85 kPa to 37 kPa, and the safety factor of the roadbed decreases to 1.2. Under the same rainfall intensity and duration, the fill gradation has a great influence on the stability of roadbed. There is a critical value of rainfall intensity. Once the rainfall intensity exceeds the critical value(150 mm?d-1), the roadbed displacement increases rapidly, the pore pressure changes rapidly, the roadbed instability time is shortened, and the damage degree is aggravated. The sliding failure of roadbed caused by rainfall infiltration is often shallow sliding. By strengthening the protection and drainage of roadbed slope, the influence of rainfall on shallow soil of roadbed can be reduced and the stability of roadbed can be improved.

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Last Update: 2023-05-20