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

卷:

38卷

期数:

2021年06期

页码:

177-185

栏目:

出版日期:

2021-11-05

文章信息/Info

Title:

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

文章编号:

1673-2049(2021)06-0177-09

作者:

张常光^1,2,吴 凯¹,李宗辉¹,关港辉¹

(1. 长安大学 建筑工程学院,陕西 西安 710061; 2. 成都理工大学 地质灾害防治与地质环境保护国家重点实验室,四川 成都 610059)

Author(s):

ZHANG Chang-guang^1,2, 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)

关键词:

非饱和土;  上埋式涵洞;  竖向土压力;  基质吸力;  中间主应力

Keywords:

unsaturated soil;  positive buried culvert;  vertical earth pressure;  matric suction;  intermediate principal stress

分类号:

TU432

DOI:

10.19815/j.jace.2021.04092

文献标志码:

A

摘要:

基于非饱和土的平面应变抗剪强度公式,考虑中间主应力和基质吸力的共同影响,分别建立了均匀与线性2种吸力分布下非饱和土上埋式涵洞的竖向土压力公式,并对其进行可比性分析,对比文献数值模拟和模型试验进行正确性验证,最后探讨了各参数的影响特性。研究结果表明:所建立的上埋式涵洞竖向土压力公式为系列化的有序解析解,可退化为文献已有解答并包含众多新解答,并能计算涵顶上方不同高度处的竖向土压力,工程应用前景广泛; 基质吸力对涵顶竖向土压力具有重要影响,且线性吸力影响不如均布吸力明显,应考虑回填土的非饱和特性并实测吸力分布; 中间主应力效应随基质吸力和填土高度的增大而更加显著,同时均布吸力下中间主应力效应较明显,应合理选取强度准则以反映回填土强度的中间主应力作用; 等沉面高度与回填土物理力学性质、中间主应力效应、基质吸力及分布形式等有关; 基质吸力及其分布影响、中间主应力效应均与填土高度密切相关,体现了多因素对涵顶竖向土压力的综合影响。

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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相似文献/References:

[1]赵均海,殷 佳,张常光,等.降雨条件下非饱和朗肯土压力统一解[J].建筑科学与工程学报,2016,33(02):1.
　ZHAO Jun-hai,YIN Jia,ZHANG Chang-guang,et al.Unified Solution of Rankine’s Earth Pressure of Unsaturated Soil Under Rainfall[J].Journal of Architecture and Civil Engineering,2016,33(06):1.
[2]张常光,赵均海,朱倩.非饱和土抗剪强度公式分类及总结[J].建筑科学与工程学报,2012,29(02):74.
　ZHANG Chang-guang,ZHAO Jun-hai,ZHU Qian.Classification and Summary of Shear Strength Formulae for Unsaturated Soils[J].Journal of Architecture and Civil Engineering,2012,29(06):74.

备注/Memo

备注/Memo:

收稿日期:2021-04-27
基金项目:国家自然科学基金项目(41202191); 地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2020K022); 中央高校基本科研业务费专项资金项目(300102280108)
作者简介:张常光(1982-),男,山东菏泽人,教授,工学博士,博士后,E-mail:zcg1016@163.com。

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