理论与试验研究

钢渣-矿粉改良黄土-红层泥岩的本构模型研究

  • 余云燕 ,
  • 田皓磊 ,
  • 罗崇亮 ,
  • 丁小刚
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  • 1.兰州交通大学 土木工程学院,兰州 730070;
    2.天水师范学院 土木工程学院,甘肃 天水 741001
余云燕(1968—),女,浙江江山人,博士,教授,主要从事岩土力学、土与结构耦合动力学方面的研究。E-mail:yuyunyan@mail.lzjtu.cn

收稿日期: 2025-06-11

  网络出版日期: 2026-04-28

基金资助

甘肃省科技计划资助项目(21YF5GA050);甘肃省教育厅产业支撑计划项目资助(2021CYZC-28)

Research on the Constitutive Model of Steel Slag-Mineral Powder Modified Loess-Red Bedded Mudstone

  • Yu Yunyan ,
  • Tian Haolei ,
  • Luo Chongliang ,
  • Ding Xiaogang
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  • 1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, P.R. China;
    2. School of Civil Engineering, Tianshui Normal University, Tianshui, Gansu 741001, P.R. China

Received date: 2025-06-11

  Online published: 2026-04-28

摘要

针对甘肃地区红层泥岩上覆黄土的地质特点,采用钢渣、矿粉两种工业固废,通过击实、三轴CU试验,开展关于改良黄土-红层泥岩混合填料的力学特性及本构模型的研究。结果表明:(1)当黄土∶红层泥岩质量比为1∶3时,混合填料最大干密度最大;(2)钢渣的质量掺量为7.5%时,其抗剪强度最大,矿粉的质量掺量越大,其抗剪强度越大;(3)经验证,钢渣改良前后土样的应变硬化过程,可由邓肯-张模型准确拟合;(4)针对沈珠江推广双曲线模型不能很好拟合应变强软化的问题,本文提出采用正解、负解分阶段拟合方法可以准确拟合出矿粉改良土的应变强软化过程。

本文引用格式

余云燕 , 田皓磊 , 罗崇亮 , 丁小刚 . 钢渣-矿粉改良黄土-红层泥岩的本构模型研究[J]. 地下空间与工程学报, 2026 , 22(2) : 481 -494 . DOI: 10.20174/j.JUSE.2026.02.10

Abstract

Aiming at the geological characteristics of loess overlying red-bedded mudstone in the Gansu area, two kinds of industrial solid wastes, namely steel slag and mineral powder are adopted to carry out the research on the mechanical properties and the constitutive model of the modified loess-red bedded mudstone mixed fill by compacting and triaxial CU test. The results show that: (1) The maximum dry density of the mixed fill is the largest when the mass ratio of loess: red mudstone is 1∶3. (2) The shear strength of steel slag is maximum when the mass dosing of steel slag is 7.5%. The larger the mass dosing of mineral powder is, the larger the shear strength is. (3) It is verified that the strain hardening process of soil samples before and after steel slag improvement could be accurately fitted by the Duncan-Zhang model. (4) For the problem that the hyperbolic model promoted by Shen Zhujiang can not fit the strain hardening well, this paper proposes to use the staged fitting method with positive and negative solutions, and it is verified that this method can accurately fit the strain hardening process of the mineral powder amended soil.

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