NaCl溶液作用下深海沉积物基本物理力学响应ADDIN CNKISM.UserStyle

胡士骏; 陈盼; 韦昌富; 伊盼盼; 王勇

doi:10.11779/CJGE2021S2034

NaCl溶液作用下深海沉积物基本物理力学响应ADDIN CNKISM.UserStyle English Version

胡士骏^{1, 2,},
陈盼^{1, 2, ,},
韦昌富^{1, 2},
伊盼盼¹,
王勇^{1, 2}

1.
中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北　武汉　430071
2.
中国科学院大学,北京　100049

基金项目:

国家自然科学基金项目 51939011

国家自然科学基金项目 41877269

国家自然科学基金项目 51979269

国家自然科学基金项目 12002243

详细信息

作者简介:
胡士骏(1992— ),男,博士研究生,主要从事海洋土力学性质方面的研究工作。E-mail: hushijun13@mail.ucas.edu.cn

通讯作者:
陈盼, E-mail: pchen@whrsm.ac.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2021-08-12
- 网络出版日期: 2022-12-05
- 刊出日期: 2021-10-31

Effect of NaCl solution on primary physical-mechanical behaviors of deep-sea sediments

HU Shi-jun^{1, 2,},
CHEN Pan^{1, 2, ,},
WEI Chang-fu^{1, 2},
YI Pan-pan¹,
WANG Yong^{1, 2}

1.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 深海沉积物所处的深海溶液环境会随洋流、油气开采等工程活动而产生较大的扰动,亟需开展溶液浓度变化下深海沉积物物理力学特性规律研究。主要开展了NaCl溶液浓度变化下深海沉积物微细观结构、自由沉降、液限、流变和固结特性规律的演化研究。研究表明：盐分使得深海沉积物絮凝程度增强,显著加快颗粒的沉降速率,其自由沉降曲线呈典型的三阶段。深海沉积物的液限和流变屈服应力随NaCl溶液浓度增大而增大,与去离子水相比,1.0 mol/L的NaCl溶液使其流变屈服应力增大3倍。同时NaCl溶液浓度的增大使得深海沉积物的压缩模量增大。
- NaCl溶液 /
- 深海沉积物 /
- 液限 /
- 自由沉降 /
- 流变
Abstract: The environment of the salt solution in deep sea can be greatly disturbed by the ocean currents and oil-gas exploitation. Therefore, it is necessary to explore the effects of saline solution on the physical-mechanical behaviors of the deep-sea sediments. The effects of sodium chloride solution on the microscopic fabrics of the deep-sea sediments from the South China Sea are firstly explored using the scanning electron microscope. Subsequently, different methods are used to measure the basic physical properties, rheological and deformation characteristics of the deep-sea sediments under variable concentrations of saline solutions, including free settlement, liquid limit, rheology and consolidation tests. The results show that the flocculated structure is enhanced in the sediments under the effects of saline solutions with the scanning electron microscope. Furthermore, the settling velocity of the sediment particles in the saline sotuion is much larger than that in the deionized water. The free settlement curves can be divided into three characteristic stages. The liquid limit and yield stress of the sediments also increase when the concentration of the saline solution increases. It’s worth noting that the yield stress saturated by the NaCl solution with the concentration 1.0 mol/L is three times larger than that saturated with deionized water. The oedometric moduli of the sediments increase with the increasing concentration of NaCl solution.
- NaCl solution /
- deep-sea sediment /
- liquid limit /
- free settling /
- rheology

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图 1 扫描电镜照片

Figure 1. SEM photos

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图 2 扫描电镜照片

Figure 2. SEM photos of soil samples

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图 3 不同盐浓度土样自由沉降

Figure 3. Free settlements of soil samples with different salt concentrations

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图 4 液限随盐浓度变化图

Figure 4. Variation of liquid limit with salt concentration

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图 5 不同盐浓度土样剪切应力应变关系

Figure 5. Relationship between shear stress and strain of soil samples with different salt concentrations

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图 6 不同盐浓度土样压缩曲线

Figure 6. Compression curves of soil samples with different salt concentrations

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参考文献(10)

[1]	SONG M M, ZENG L L, HONG Z S. Pore fluid salinity effects on physicochemical-compressive behaviour of reconstituted marine clays[J]. Applied Clay Science, 2017, 146: 270-277. doi: 10.1016/j.clay.2017.06.015
[2]	张彤炜, 邓永锋, 吴子龙, 等. 考虑孔隙水盐分效应的人工软黏土工程特性与本构模型[J]. 岩土工程学报, 2018, 40(9): 1690-1697. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201809019.htm ZHANG Tong-wei, DENG Yong-feng, WU Zi-long, et al. Engineering behavior and constitutive model of artificial soft clay considering pore water salinity effect[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(9): 1690-1697. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201809019.htm
[3]	VERMEIJDEN C, KAY S, GOEDEMOED S. Influence of salinity on soil properties[C]//Proceedings of the 1st International Symposium on Frontiers in Offshore Geotechnics. 2005.
[4]	PUECH A, DELAGE P, DE GENNARO V. On the compressibility of deepwater sediments of the Gulf of Guinea[C]//Proceedings of the 1st International Symposium on Frontiers in Offshore Geotechnics. 2005.
[5]	LI H, KONG G Q, WEN L, et al. Pore pressure and strength behaviors of reconstituted marine sediments involving thermal effects[J]. International Journal of Geomechanics, 2021, 21(4): 06021008. doi: 10.1061/(ASCE)GM.1943-5622.0001984
[6]	THOMPSON D, BEASLEY D J, TRUE D G, et al. Handbook for Marine Geotechnical Engineering[M]. Hueneme: Naval Facilities Engineering Command Port, 2012.
[7]	SRIDHARAN A, PRAKASH K. Characteristic water contents of a fine-grained soil-water system[J]. Géotechnique, 1998, 48(3): 337-346. doi: 10.1680/geot.1998.48.3.337
[8]	土工试验方法标准：GB/T50123－2019[S]. 北京: 中国计划出版社, 2019. Standard for Geotechnical Test Method: GB/T50123－2019[S]. Beijing: China Planning Press, 2019. (in Chinese)
[9]	MITCHELL J K, SOGA K. Fundamentals of Soil Behavior[M]. 3rd ed. New York: Wiley, 2005.
[10]	YING Z, CUI Y J, DUC M, et al. Salinity effect on the liquid limit of soils[J]. Acta Geotechnica, 2021, 16(4): 1101-1111. doi: 10.1007/s11440-020-01092-7