岩土力学 ›› 2023, Vol. 44 ›› Issue (6): 1593-1603.doi: 10.16285/j.rsm.2022.1193

• 基础理论与实验研究 • 上一篇    下一篇

石灰−偏高岭土改良遗址土强度劣化特性的冻融循环效应

李新明1, 2，张浩扬1, 2，武迪1, 2，郭砚睿1, 2，任克彬3，谈云志4   

  1. 1. 中原工学院 建筑工程学院，河南 郑州 450007；2. 中原工学院 河南省环境岩土工程与地下工程灾害控制工程研究中心，河南 郑州 450007； 3. 河南省文物建筑保护研究院，河南 郑州 450007；4. 三峡大学 三峡库区地质灾害教育部重点实验室，湖北 宜昌 443002
  • 收稿日期:2022-08-01 接受日期:2022-10-23 出版日期:2023-06-14 发布日期:2023-06-14
  • 作者简介:李新明，男，1987年生，博士，副教授，主要从事特殊土土力学及土遗址保护方面的研究工作。
  • 基金资助:
    河南省高等学校青年骨干教师资助计划项目（No.2019GGJS142）；河南省高等学校重点科研项目计划基础研究专项（No.20ZX009）；国家自然科学基金（No.51509274）；河南省科技攻关项目（No.202102310584，No.222102320060）。

Strength deterioration characteristics of lime-metakaolin improved earthen site soil under freeze-thaw cycles

LI Xin-ming1, 2, ZHANG Hao-yang1, 2, WU Di1, 2, GUO Yan-rui1, 2, REN Ke-bin3, TAN Yun-zhi4   

  1. 1. School of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou, Henan 450007, China; 2. Research Center of Environmental Geotechnical Engineering and Underground Engineering Disaster Control Engineering of Henan Province, Zhongyuan University of Technology, Zhengzhou, Henan 450007, China; 3. Henan Provincial Architectural Heritage Protection and Research Institute, Zhengzhou, Henan 450007, China; 4. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang, Hubei 443002, China
  • Received:2022-08-01 Accepted:2022-10-23 Online:2023-06-14 Published:2023-06-14
  • Supported by:
    This work was supported by the Henan Provincial College Young Backbone Teacher Project (2019GGJS142), the Basic Research Project of Henan Provincial Key Scientific Research Project (20ZX009), the National Natural Science Foundation of China (51509274) and the Scientific and Technological Project of Henan Province (202102310584, 222102320060)

PDF (Chinese)

335

PDF (English)

8

摘要： 中原地区处于季冻区，周期性冻结与融化对遗址土体结构有显著影响。为探究石灰偏高岭土（L-MK）在抗冻融循环方面替代天然水硬性石灰（NHL）用于土遗址修复工作的可行性，以石灰、偏高岭土和遗址土为主要原料，对经历不同冻融循环次数的L-MK改良土试样分别进行质量损失测试、无侧限抗压强度试验和劈裂抗拉强度试验，系统研究其强度特性的冻融循环效应；并取部分试样进行X射线衍射（XRD）、热重（TG）、电镜扫描（SEM）等微观试验，揭示L-MK改良土强度劣化规律的内在机制。结果表明：试验配合比下，L-MK改良土的抗冻性能优于NHL改良土，偏高岭土掺量的增加有助于提高L-MK改良土强度；随着冻融循环次数的增加，L-MK改良土应力−应变曲线的应变软化特征呈减弱趋势，无侧限抗压强度和劈裂抗拉强度单调衰减，但经历30次冻融循环后L-MK改良土无侧限抗压强度和劈裂抗拉强度分别高于NHL改良土3.79倍和1.16倍以上。这与L-MK及NHL 改良土生成的水化产物（CSH和C4AH13等）受冻融循环的影响规律基本一致。

关键词: 土遗址, 冻融循环, 石灰偏高岭土, 水硬性石灰, 微观结构

Abstract: The Central Plains are located in an area that experiences seasonal freeze-thaw cycles, which can have significant effects on the soil structure of soil relics. To determine if lime-metakaolin (L-MK) is a feasible alternative to natural hydraulic lime (NHL) for earth site restoration work, tests were conducted using lime, metakaolin and silty sand from the site as main raw materials. Mass loss, unconfined compressive strength and splitting tensile strength tests were carried out on L-MK improved silty sand soil undergoing different numbers of freeze-thaw cycles to study its strength characteristics in depth. X-ray diffraction (XRD) thermogravimetry (TG), and scanning electron microscope (SEM) microscopic tests were also performed on some samples to reveal the internal mechanism of strength deterioration law of L-MK improved soil. Results indicate that L-MK improved soil has better freeze-thaw cycle resistance than NHL improved soil under the experimental mix ratio. Increasing the content of metakaolin improves the strength of L-MK improved soil. As the number of freeze-thaw cycles increases, the strain softening characteristics of L-MK improved soil show a weakening trend, and unconfined compressive strength and tensile strength decrease monotonically. After 30 freeze-thaw cycles, the unconfined compressive strength and splitting tensile strength of L-MK improved soil are about 3.79 and 1.16 times higher than that of NHL improved soil, respectively. The variation of strength is consistent with hydration products such as CSH and C4AH13 generated by hydration reaction under the influence of freeze-thaw cycle for L-MK and NHL improved soil.

Key words: earthen sites, freeze-thaw cycle, lime-metakaolin, hydraulic lime, microstructure

中图分类号: TU449
[1] 郅彬, 魏园钧, 王番, 张茜, 刘存利, 任会明, . 冻融循环作用下含Na2SO4盐原状黄土宏观强度与微观结构关联机制研究[J]. 岩土力学, 2025, 46(S1): 106-120.
[2] 张兴文, 曹净, 雷舒羽, 李育红, 程芸, 张柠锐, . 富里酸环境对含腐殖酸水泥土结构及渗透性影响研究[J]. 岩土力学, 2025, 46(S1): 249-261.
[3] 屈俊童, 时启壮, 郭颖杰, 张 翔, 刘 熠, 蒋德阳. 冻融循环作用下冰碛土力学特性及损伤机制研究[J]. 岩土力学, 2025, 46(9): 2859-2872.
[4] 李新明, 何永飞, 谈云志, 任克彬, 张先伟, 尹松, . 不同含水率下石灰−偏高岭土改良遗址土宏微观特性的冻融循环效应[J]. 岩土力学, 2025, 46(9): 2894-2906.
[5] 孙闯, 蒲云波, 敖云鹤, 陶琦, . 冻融饱水裂隙砂岩力学特性及细观破裂演化特征研究[J]. 岩土力学, 2025, 46(8): 2339-2352.
[6] 刘文林, 鄂天龙, 冯杨州, 牛松荧, 张子堂, 孙熠, 陈宏信, . 纳米改性地聚合物隔离墙材料基本工程特性及冻融循环耐久性研究[J]. 岩土力学, 2025, 46(7): 2039-2048.
[7] 姜海波, 卢燕, 李琳, 张军, . 干湿-冻融作用输水渠道膨胀土强度特性及损伤演化规律研究[J]. 岩土力学, 2025, 46(5): 1356-1367.
[8] 张荣, 赵斌, 郑小川, 陈令, 卢正, 赵阳, . 新型盐渍土基泡沫轻质土隔断层阻盐机制及效果研究[J]. 岩土力学, 2025, 46(2): 515-526.
[9] 贺元源, 彭绮澜, 王力, 王世梅, 佴磊, 徐燕, 吕岩, 陈勇, 张先伟, . 基于多微观手段的季冻区草炭土孔隙特征和渗透性研究[J]. 岩土力学, 2025, 46(1): 110-122.
[10] 肖劲卿, 温松诚, 郭源, . 基于单孔冲刷测试的黏性土抗侵蚀性及各向异性试验研究[J]. 岩土力学, 2025, 46(1): 187-198.
[11] 王丽艳, 蒋飞, 庄海洋, 王炳辉, 张雷, 李明, . 考虑水化期影响的橡胶−钢渣填料动力特性与微观分析[J]. 岩土力学, 2024, 45(S1): 53-62.
[12] 程鑫, 江文豪, 黄啸, 李爽, 王应富, 李江山, . 自硬化竖向屏障材料在Cr(Ⅵ)污染液作用下工程性能及微观结构演化[J]. 岩土力学, 2024, 45(S1): 225-238.
[13] 丁旭升, 张凌凯, 樊培培, . 干湿冻融循环条件下重塑性黄土的强度劣化规律及非线性模型研究[J]. 岩土力学, 2024, 45(S1): 324-336.
[14] 崔凯, 于翔鹏, 吴国鹏, 许鹏飞, 葛诚瑞, . 桩-浆联合模式下土遗址裂隙注浆加固机制[J]. 岩土力学, 2024, 45(S1): 607-618.
[15] 谌文武, 王科玉, 祁强, 张少冉, 王立, . 降水与蒸发交替作用下西北土遗址盐分迁移与赋存规律[J]. 岩土力学, 2024, 45(8): 2209-2220.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
版权所有 © 《岩土力学》编辑部
地址：湖北武汉武昌小洪山中国科学院武汉岩土力学研究所(430071)　邮编：200042　电话：027-87198484　E-mail: ytlx@whrsm.ac.cn
本系统由北京玛格泰克科技发展有限公司设计开发