The Influence of Moisture Content on Thixotropic Strength Recovery of Zhanjiang Formation Structural Clay

  • XIE Yan-hua , 1, 2 ,
  • TANG Bin , 1 ,
  • XU Ji-cheng 1 ,
  • HAN Wei-chao 1 ,
  • ZHANG Bing-hui 1
Expand
  • 1. Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin 541004, China
  • 2. School of Energy Engineering and Building Environment, Guilin University of Aerospace Technology, Guilin 541004, China

Received date: 2025-04-01

  Revised date: 2025-06-17

  Online published: 2025-09-01

Abstract

The moisture content significantly influences the thixotropic strength recovery of the Zhanjiang Formation structural clay. To investigate the influence pattern and mechanism, the remolded Zhanjiang Formation structural clay was used as the research subject, and a 150-day thixotropy test was conducted. Unconfined compressive strength tests, direct shear tests, and scanning electron microscopy (SEM) experiments were performed on samples with diverse initial moisture contents (30%, 33%, 36%, and 39%) and various thixotropic durations (0, 1 day, 10 days, 30 days, 60 days, 100 days, and 150 days). The results showed that the strength of the samples gradually recovered over time, with the recovery process of unconfined compressive strength and cohesion exhibiting an initial rapid and significant recovery phase (0-30 days) followed by a subsequent slower, more stable phase (30-150 days). Additionally, higher moisture content accelerates the rate of strength recovery. Upon comparing the thixotropic strength ratios based on unconfined compressive strength and cohesion, due to the shearing action, soil particles aligned in a specific direction, resulting in a higher thixotropic strength ratio for cohesion. During the thixotropic process, pore parameters (porosity and abundance) and particle parameters (entropy probability and distribution fractal dimension) decreased with increasing thixotropy duration. Through self - adaptive adjustments, soil particles enhanced their orientation and orderliness. Under the influence of van der Waals forces, the degree of particle aggregation increased, resulting in a reduction of pores both between and within aggregates. Furthermore, water played a crucial role by altering the relative positions of particles and broadening the migration pathways, thereby enhancing the activity of particles and accelerating the strength recovery rate during the thixotropic process.

Cite this article

XIE Yan-hua , TANG Bin , XU Ji-cheng , HAN Wei-chao , ZHANG Bing-hui . The Influence of Moisture Content on Thixotropic Strength Recovery of Zhanjiang Formation Structural Clay[J]. Journal of Changjiang River Scientific Research Institute, 2025 . DOI: 10.11988/ckyyb.20250292

[1]
臧濛, 孔令伟, 郭爱国. 静偏应力下湛江结构性黏土的动力特性[J]. 岩土力学, 2017, 38(1):33-40.

( ZANG Meng, KONG Ling-wei, GUO Ai-guo. Dynamic characteristics of structural Zhanjiang clay under static deviatoric stress[J]. Journal of Rock and Soil Mechanics, 2017, 38(1): 33-40.. ( in Chinese )

[2]
王传杰, 汤斌. 上覆压力对湛江组结构性黏土触变性的影响机制[J]. 科学技术与工程, 2023, 23(4):1650-1657.

WANG Chuan-jie, TANG Bin. Influence mechanism of overlying pressure on the thixotropy of Zhanjiang formation structural clay[J]. Journal of Science Technology and Engineering, 2023, 23(4): 1650-1657. (in Chinese) )

[3]
SEED H B, CHAN C K. Thixotropic characteristics of compacted clays[J]. Journal of the Soil Mechanics & Foundations Division, 1957, 83(4): 1-35.

[4]
刘娟娟, 曾国红, 孟令帅, 等. 扰动对粉土触变强度恢复影响规律研究[J]. 地下空间与工程学报, 2016, 12(5):1294-1299.

LIU Juan-juan, ZENG Guo-hong, MENG Ling-shuai, et al. Influence of disturbance on thixotropic strength recovery of silt[J]. Chinese Journal of Underground Space and Engineering, 2016, 12(5): 1294-1299. (in Chinese) )

[5]
杨爱武, 杨少朋, 张静, 等. 天津软黏土触变特性研究[J]. 工程地质学报, 2023, 31(5):1528-1534.

YANG Ai-wu, YANG Shao-peng, ZHANG Jing, et al. Study on thixotropic characteristics of Tianjin soft clay[J]. Journal of Engineering Geology, 2023, 31(5): 1528-1534. (in Chinese) )

[6]
赵盛男, 霍玉龙, 汤斌. 湛江组结构性黏土触变性正交试验及其触变强度预测模型[J]. 岩土力学, 2023, 44(S1): 197-205.

( ZHAO Sheng-nan, HUO Yu-long, TANG Bin. Orthogonal test on thixotropy of Zhanjiang formation structural clay and its thixotropic strength prediction model[J]. Journal of Rock and Soil Mechanics, 2023, 44(S1): 197-205. (in Chinese ) : 197-205.(in Chinese) )

[7]
TANG B, ZHOU B, XIE L, et al. Strength recovery model of clay during thixotropy[J]. Advances in Civil Engineering, 2021, 5:8825107.

[8]
SHAHRIAR A R, JADID R. An experimental investigation on the effect of thixotropic aging on primary and secondary compression of reconstituted dredged clays[J]. Applied Clay Science, 2018, 162: 524-533.

[9]
张目极. 水的存在形式对湛江组结构性黏土触变性影响的试验研究[D]. 桂林: 桂林理工大学, 2020.

ZHANG Mu-ji. Experimental Study on the Influence of Water Existence Forms on the Thixotropy of Structural Zhanjiang Clay[D]. Guilin: Guilin University of Technology, 2020. ) (in Chinese)

[10]
霍海峰, 齐麟, 雷华阳, 等. 天津软黏土触变性的思考与试验研究[J]. 岩石力学与工程学报, 2016, 35(3):631-637.

HUO Hai-feng, QI Lin, LEI Hua-yang, et al. Reflections and experimental study on thixotropy of Tianjin soft clay[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(3): 631-637. (in Chinese) )

[11]
汤斌, 赵盛男, 周标和, 等. 基于模糊数学理论的湛江组黏土触变性强弱分级[J]. 水利水电科技进展, 2021, 41(4): 35-39,94.

( TANG Bin, ZHAO Sheng-nan, ZHOU Biao-he, et al. Grading of thixotropic strength of Zhanjiang formation clay based on fuzzy mathematics theory[J]. Advances in Science and Technology of Water Resources, 2021, 41(4): 35-39,94. (in Chinese )

[12]
ALAM M K, SHAHRIAR A R, ISLAM M S, et al. Experimental investigation on the strength and deformation aspects of thixotropic aging in reconstituted clays[J]. Geotechnical and Geological Engineering, 2021, 39(3): 2471-2486.

[13]
张先伟, 孔令伟, 李峻, 等. 黏土触变过程中强度恢复的微观机理[J]. 岩土工程学报, 2014, 36(8): 1407-1413.

ZHANG Xian-wei, KONG Ling-wei, LI Jun, et al. Microscopic mechanism of strength recovery during thixotropy of clay[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(8): 1407-1413. (in Chinese) )

[14]
陈宝, 束庆霏, 邓荣升. 考虑板状颗粒间相互作用的黏土强度时效性的微观解释[J]. 岩土工程学报, 2021, 43(2): 271-280.

CHEN Bao, SHU Qing-fei, DENG Rong-sheng. Microscopic interpretation of time-dependent strength of clay considering interactions between platy particles[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(2): 271-280. (in Chinese) )

[15]
徐永福, 王驰, 黄铭, 等. 湿喷桩施工中饱和粉土的触变性研究[J]. 岩土工程学报, 2013, 35(10):1784-1789.

XU Yong-fu, WANG Chi, HUANG Ming, et al. Study on thixotropy of saturated silt during wet jet grouting pile construction[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(10): 1784-1789. (in Chinese) )

[16]
王巍. 湛江组结构性黏土触变机理研究[D]. 桂林: 桂林理工大学, 2019.

WANG Wei. Study on the Thixotropic Mechanism of Structural Zhanjiang Clay[D]. Guilin: Guilin University of Technology, 2019. ) (in Chinese)

[17]
肖树芳, 房后国, 王清. 软土中结合水与固结、蠕变行为[J]. 工程地质学报, 2014, 22(4):531-535.DOI:10.13544/ j.cnki.jeg.2014.04.001. (XIAO Shu-fang, FANG Hou-guo, WANG Qing. Bound water and consolidation and creep behavior in soft clay[J]. Journal of Engineering Geology, 2014, 22(4): 531-535. ) (in Chinese)

[18]
吴谦. 软粘土的结合水对其次固结和长期强度的影响及机理研究[D]. 吉林: 吉林大学, 2015.

WU Qian. Influence and Mechanism of Bound Water on Secondary Consolidation and Long-term Strength of Soft Clay[D]. Jilin:Jilin University, 2015. ) (in Chinese)

[19]
袁建滨. 粘土中结合水特性及其测试方法研究[D]. 广州: 华南理工大学, 2012.

YUAN Jian-bin. Characteristics of Bound Water in Clay and Its Testing Methods[D]. Guangzhou: South China University of Technology, 2012. ) (in Chinese)

[20]
MITCHELL J K. Fundamental aspects of thixotropy in soils[J]. Journal of the Soil Mechanics and Foundations Division, 1960, 86(118): 19-52.

[21]
DIAMOND S. Pore size distributions in clays[J]. Clays and Clay Minerals, 1970, 18(1): 7-23.

Outlines

/