|Table of Contents|

Calculation of vertical stress in subgrade and foundation base under wheel load(PDF)

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

Issue:
2011年01期
Page:
26-30
Research Field:
Publishing date:
2011-02-28

Info

Title:
Calculation of vertical stress in subgrade and foundation base under wheel load
Author(s):
NIU Xi-rong1; 2;  HAN Ping2;  ZHANG Xiao-yan2
1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China;
2. Key Laboratory for Loess Area Highway Construction & Maintenance Technology of Ministry of Transport, Shanxi Province Communications Scientific Research Institute, Taiyuan 030006, Shanxi, China
Keywords:
road engineering;  subgrade;  foundation base;  vertical stress;  calculation
PACS:
U416.1
DOI:
-
Abstract:
In order to verify the bearing capacity of the special filler(such as soft rock, weathered rock, artificial materials)under the special traffic loads(such as overloading), on the premise of the standard wheel loads(25 kN and 0.7 MPa), considering the variations of the non-standard traffic loads and the backfill density, the vertical stress in subgrade and foundation base were calculated under concentrated wheel load and distributed wheel load. Because of the difference of compressive modulus between pavement material and subgrade backfill, the spread angles of stress are considered. When calculating the foundation base vertical stress under the subgrade center, the subgrade was regarded as strip foundation. The calculation results show that the add-itional stress produced by the distributed wheel load are greater than those obtained by the concentrated wheel load, and both of them tend to same beyond the subgrade depth of 3 m; the variations of wheel load have important influence on the vertical additional stress in subgrade, and the influence depth is about 3 m; the foundation base total stress produced by the standard wheel loads(25 kN and 0.7 MPa)tend to same when the subgrade height is greater than 5 m; a linear growth relation can be found between the foundation base total stress and the filling height of subgrade when the filling height of subgrade is higher than 1 m. 1 tab, 8 figs, 13 refs.

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Last Update: 2011-02-28