|Table of Contents|

Formulation of Vertical Earth Pressure Against Positive Buried Culvert in Unsaturated Soils Considering Intermediate Principal Stress(PDF)

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

Issue:
2021年06期
Page:
177-185
Research Field:
Publishing date:

Info

Title:
Formulation of Vertical Earth Pressure Against Positive Buried Culvert in Unsaturated Soils Considering Intermediate Principal Stress
Author(s):
ZHANG Chang-guang1; 2;  WU Kai1;  LI Zong-hui1;  GUAN Gang-hui1
(1. School of Civil Engineering, Chang’an University, Xi’an 710061, Shaanxi, China; 2. Stake Key Laboratory of Geohazard Prevetion and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China)
Keywords:
unsaturated soil;  positive buried culvert;  vertical earth pressure;  matric suction;  intermediate principal stress
PACS:
TU432
DOI:
10.19815/j.jace.2021.04092
Abstract:
Based on the shear strength equation of unsaturated soils in the plane strain condition to account for interaction influences of intermediate principal stress and matric suction, the formulations of vertical earth pressure against positive buried culvert in unsaturated soils under uniform and linear distributions of matric suction were established, respectively. Comparability analysis of the proposed formulation was then carried out. Comparing validations against numerical simulations and model tests reported in the literature were performed, and parametric studies were finally discussed. The study results show that the proposed formulation of vertical earth pressure is a series of orderly analytical solutions, which can reduce to available results and involve many new ones to calculate vertical earth pressure at different depths above the culvert top. Therefore, the proposed formulation has good comparability and broad applicability. The influence of matric suction on vertical earth pressure at the culvert top is significant, and the influence of linear suction is not as obvious as that of uniform suction, so the unsaturated characteristics of backfill soils should be considered and suction distributions should be field measured. The influence of intermediate principal stress on vertical earth pressure increases with matric suction and backfill soil height and is more obvious for uniform suction, so a reasonable strength criterion should be adopted to describe the influence of intermediate principal stress on backfill soil strength. The height of equal settlement plane is dependent on physical and mechanical properties of backfill soils, intermediate principal stress, matric suction and its distribution. The influence of matric suction and its distribution as well as the influence of intermediate principal stress are closely related to backfill soil height, which indicates comprehensive influences of multiple factors on vertical earth pressure at the culvert top.

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Last Update: 2021-11-01