吉林大学学报(工学版) ›› 2020, Vol. 50 ›› Issue (1): 156-164.doi: 10.13229/j.cnki.jdxbgxb20181171

• 交通运输工程·土木工程 • 上一篇    

非饱和重塑黄土⁃混凝土接触面修正双曲线模型

高登辉1,2(),邢义川2,郭敏霞3,张爱军3,王献涛4,马保红5   

  1. 1. 黄淮学院 建筑工程学院, 河南 驻马店 463000
    2. 中国水利水电科学研究院, 北京100048
    3. 西北农林科技大学 水利与建筑工程学院, 陕西 杨凌712100
    4. 驻马店职业技术学院 建筑工程系, 河南 驻马店 463000
    5. 甘肃公航旅工程咨询有限公司, 兰州 730030
  • 收稿日期:2018-11-26 出版日期:2020-01-01 发布日期:2020-02-06
  • 作者简介:高登辉（1988-），男，博士研究生. 研究方向：非饱和土的力学性质及工程应用.E-mail:1403970876@qq.com
  • 基金资助:
    国家自然科学基金项目(51379220)

Modified hyperbola model of interface between unsaturated remolded loess and concrete

Deng-hui GAO1,2(),Yi-chuan XING2,Min-xia GUO3,Ai-jun ZHANG3,Xian-tao WANG4,Bao-hong MA5   

  1. 1. Department of Architectural and Civil Engineering, University of Huanghuai, Zhumadian 463000, China
    2. China Institute of Water Resources and Hydropower Research, Beijing 100048, China
    3. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
    4. Department of Architectural Engineering, Zhumadian Vocational and Technical College, Zhumadian 463000, China
    5. Gansu Provincial Highway Aviation Tourism Investment Group, Lanzhou 730030, China
  • Received:2018-11-26 Online:2020-01-01 Published:2020-02-06

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摘要：

为解决非饱和土与结构物接触计算中的力水耦合问题，进行了不同含水率重塑黄土与混凝土接触面的直剪试验，首先根据试验规律分别简化了双曲线模型中初始剪切劲度系数、极限抗剪强度与法向应力间的关系表达式，然后引入含水率这一变量，建立了适用于非饱和土的接触面修正双曲线模型，该模型具有6个参数，通过不同含水率的接触面直剪试验即可获得。计算结果与试验结果的对比证明了该模型的可行性。该修正双曲线模型可以同时考虑法向应力与含水率两变量，可以较好地实现非饱和黄土与结构物的接触计算。

关键词: 岩土工程, 非饱和黄土, 接触面, 直剪试验, 双曲线模型

Abstract:

In order to solve the problem of interface calculation between unsaturated soil and structure coupled force and water, the direct shear tests of remolded loess and concrete interface with different moisture content were carried out. Firstly, the relationships between the initial shear stiffness coefficient, the ultimate shear strength and the normal stress in the hyperbolic model are simplified based on the test rule. Then the water content is introduced to establish the modified hyperbolic model suitable for unsaturated soil, which has six parameters and can be obtained by direct shear test of interface with different moisture content. The feasibility of the model is demonstrated by comparing the calculated results with the test results. The modified hyperbola model can consider both normal stress and moisture content, and can be used to calculate the interface mechanics between unsaturated soil and structure.

Key words: geotechnical engineering, unsaturated loess, interface, direct shear test, hyperbolic model

中图分类号: 

  • TU4

表1

原状黄土的基本物理特性"

埋深/m 比重 干密度/(g?cm-3) 液限/% 塑限/%
3 2.71 1.27 35.3 17.9
4 2.71 1.29 33.3 17.4
5 2.71 1.27 34.6 16.6

图1

试验图片"

图2

不同含水率试样 τ - u 数据点及拟合曲线"

图3

不同法向应力下 Δ τ ? w 关系曲线"

图4

k?σ n关系曲线"

表2

k s i 和 τ u 值"

σ n /kPa w=10% w=15% w=20% w=25%
k s i /(kPa·mm-1) τ u /kPa k s i /(kPa·mm-1) τ u /kPa k s i /(kPa·mm-1) τ u /kPa k s i /(kPa·mm-1) τ u /kPa
50 63.3 41.0 59.9 36.5 45.0 32.3 40.0 26.8
100 76.3 70.0 63.3 61.7 48.3 59.2 48.8 53.2
200 96.2 149.3 88.5 131.6 82.0 126.6 75.8 108
300 122.0 222.2 117.6 200.0 114.9 178.6 109.9 164
400 138.9 303.0 137.0 277.8 128.2 250.0 123.5 192

图5

k si?σ n关系曲线"

图6

τ u?σ n关系曲线"

表3

k si?σ n和 τ u ?σ n线性拟合参数值"

w/% s t m n
10 0.218 53.54 0.733 -1.28
15 0.234 44.12 0.693 -4.03
20 0.261 28.98 0.615 -0.69
25 0.254 26.25 0.516 2.74

图7

t?w 关系曲线"

图8

m ? w 关系曲线"

图9

模型计算与试验结果的对比"

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