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

卷:

41卷

期数:

2024年02期

页码:

1-16

栏目:

综述

出版日期:

2024-03-30

文章信息/Info

Title:

Research progress on collapsible characteristics of loess and its modification methods

文章编号:

1673-2049(2024)02-0001-16

作者:

黄 华¹,刘瑞阳¹,刘笑笑²,柳明亮^2,3

(1. 西安工业大学 建筑工程学院,陕西 西安 710021; 2. 长安大学 建筑工程学院,陕西 西安 710061; 3. 陕西省建筑科学研究院有限公司,陕西 西安 710082)

Author(s):

HUANG Hua¹, LIU Ruiyang¹, LIU Xiaoxiao², LIU Mingliang^2,3

(1. School of Civil and Architecture Engineering, Xi'an Technological University, Xi'an 710021, Shaanxi, China; 2. School of Civil and Architecture Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 3. Shaanxi Architecture Science Research Institute Co., Ltd., Xi'an 710082, Shaanxi, China)

关键词:

黄土;  湿陷性;  湿陷微观机理;  湿陷性评价;  改性

Keywords:

loess;  collapsibility;  microscopic mechanism of collapse;  collapsibility evaluation;  modification

分类号:

TU44

DOI:

10.19815/j.jace.2023.08056

文献标志码:

A

摘要:

为了减小黄土湿陷性引起的一系列地质灾害方面的危害,对现阶段黄土湿陷性的研究成果进行了梳理和分析,总结了黄土湿陷微观研究中3种主流研究方法取得的部分重要成果,剖析了国内外黄土湿陷的评价方法及其侧重差异,归纳了湿陷性黄土的改性方法,并对未来黄土湿陷微观机理和湿陷性评价的研究进行了展望。结果表明:黄土湿陷的根本原因是其本身具有独特的架空结构,黄土遇水后架空结构中的部分黏粒发生水化膨胀导致颗粒滑移且随着含水率达到阈值,黄土结构中连接薄弱处将首先发生破坏,因此其稳定性受含水率的影响显著; 目前基于多元线性回归法、偏最小二乘法等方法建立了许多关于黄土湿陷性和各项物理指标、土层埋深以及微观结构参数之间关系的湿陷性评价理论; 针对黄土湿陷量计算值和实测值之间的差异,学者提出了修正系数、湿陷性土不连续分布效应系数等参数进行修正; 湿陷性黄土的改性方法可以分为物理改性和化学改性两类,浸水法、深层强夯法等物理改性方法通过使土的孔隙结构和颗粒排列方式发生改变进而实现改性,而化学改性加固中添加的各类固化剂会同黄土中的水和可溶性盐类发生一系列反应,增加黄土中的黏粒和胶结物含量,进而实现对黄土各项性质的改善。

Abstract:

In order to reduce the hazards of a series of geological disasters caused by loess collapsibility, the research results of loess collapsibility at the present stage were sorted out and analyzed, some of the important results obtained by the three mainstream research methods in the microscopic study of loess collapsibility were summarized, the evaluation methods of loess collapsibility at home and abroad and their focus on the differences were analyzed, the modification methods of collapsible loess were summarized and the prospect of the future research of the microscopic mechanisms of loess collapse and the evaluation of collapsibility was provided. The results show that the root cause of the collapsibility of loess is its own unique bracket structure, when loess is exposed to water, some of the clay particles in the bracket structure undergo hydration and expansion, leading to particle slippage, and as the water content reaches the threshold, the weak connections in the loess structure will be the first to be damaged so the stability of the bracket structure is significantly affected by the water content. At present, based on the multiple linear regression method, the partial least squares method, and other methods, a lot of collapsibility evaluation theories have been established on the relationship between loess collapsibility and various physical indexes, soil layer depth, and microstructure parameters. Aiming at the difference between the calculated value and measured value of loess collapsibility, scholars propose correction coefficients, discontinuous distribution effect coefficients of collapsible loess, and other parameters for correction. The modification methods of collapsible loess can be divided into two categories: physical modification and chemical modification. Physical modification methods such as the water immersion method and the deep ramming method realize modification by changing the pore structure and particle arrangement of the soil. The various kinds of curing agents added in chemical modification reinforcement will have a series of reactions with water and soluble salts in loess, increasing the content of clay particles and cement in loess and thus realizing the improvement of various properties of loess.

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备注/Memo

备注/Memo:

收稿日期:2023-08-13
基金项目:陕西省杰出青年科学基金项目(2023-JC-JQ-47); 陕西省国际科技合作计划项目(2024GH-ZDXM-18); 陕西高校青年创新团队建设项目(2023); 西安市科技计划项目(23GXFW0035)
作者简介:黄 华(1979-),男,工学博士,教授,博士生导师,E-mail:huanghua23247@163.com。

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更新日期/Last Update: 2024-03-25