The Influence of Moisture Content on Thixotropic Strength Recovery of Zhanjiang Formation Structural Clay
Received date: 2025-04-01
Revised date: 2025-06-17
Online published: 2025-09-01
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.
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.
(
|
| [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.
|
| [3] |
|
| [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.
|
| [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.
|
| [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.
(
|
| [7] |
|
| [8] |
|
| [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.
|
| [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.
|
| [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.
(
|
| [12] |
|
| [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.
|
| [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.
|
| [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.
|
| [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.
|
| [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.
|
| [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.
|
| [20] |
|
| [21] |
|
/
| 〈 |
|
〉 |