碱性环境下吹填土的力学特性及微观机制分析

doi:10.13722/j.cnki.jrme.2018.1113

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Abstract Chemical environment has a significant effect on the mechanical and microscopic characteristics of the dredger fill. In this paper，a set of laboratory tests were carried out to look into the strength，deformation as well as the microscopic structure of dredger fill with various NaOH content，including direct shear test，triaxial shear test，one-dimensional compression test and microscopic test. The experimental results show that the shear strength and structural yield stress increase by 15.1–79.3 and 5–169 kPa respectively，and the reason is that the intergranular cement strength was greatly enhanced due to the insoluble substances generated in the alkaline environment. Moreover，the stress-strain relationship of dredger fill changes from strain hardening to strain softening in the alkaline environment，meanwhile，the compressibility being greatly reduced with the maximum reduction of the compression index being 60.3%. Finally，the intergranular cement of the dredger fill in the alkaline environment develops well. The particle morphology is transformed from granular structure and flaky structure to agglomerate structure，and the surface-to-surface contact is the main form of the intergranular connection.

Key words： soil mechanics dredge fill alkaline environment shear test triaxial test compression test microscopic characteristics

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	Articles by authors
	LEI Huayang1
	2
	WANG Lei1
	TU Cike1
	HAN Jun3
	JI Zhiyong3

Cite this article:

LEI Huayang1,2,WANG Lei1, et al. Analysis of mechanical properties and microscopic mechanism of dredger fill in alkaline environment[J]. , 2019, 38(S2): 3849-3858.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1113 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS2/3849

[1]	GRATCHEV I，TOWHATA I. Compressibility of natural soils subjected to long-term acidic contamination[J]. Environmental Earth Sciences，2011，64(1)：193–200.
[2]	朱春鹏，刘汉龙，沈扬. 酸碱污染土强度特性的室内试验研究[J]. 岩土工程学报，2011，33(7)：1 146–1 152.(ZHU chunpeng，LIU Hanlong，SHEN Yang. Laboratory tests on shear strength properties of soil polluted by acid and alkali[J]. Chinese Journal of Geotechnical Engineering，2011，33(7)：1 146–1 152.(in Chinese))
[3]	BOLT G H．Physical-chemical analysis of the compressibility of pure clay[J]. Geotechnique，1956，6(2)：86–93.
[4]	BOLT G H，MILLER R D. Compression studies of illite suspensions[J]. Soil Science Society of America Journal，1955，19(3)：285–288.
[5]	陈宗基. 对我国土力学、岩体力学中若干重要问题的看法[J]. 土木工程学报，1963，(5)：24–30.(TAN Jiongkie. Views on some important issues in soil mechanics and rock mechanics in China[J]. China Civil Engineering Journal，1963，(5)：24–30.(in Chinese))
[6]	GRATCHEV I，TOWHATA I. Stress-strain characteristics of two natural soils subjected to long-term acidic contamination[J]. Soils and Foundations，2013，53(3)：469–476.
[7]	赵宇，崔鹏，胡良博. 黏土抗剪强度演化与酸雨引发滑坡的关系—以三峡库区滑坡为例[J]. 岩石力学与工程学报，2009，28(3)：576–582.(ZHAO Yu，CUI Peng，HU Liangbo. Relation between evolution of clay shear strength and landslide induced by acid rain：Taking landslides in Three Gorges reservoir area for example[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(3)：576–582.(in Chinese))
[8]	WAHID A S，GAJO A，MAGGIO D. Chemo-mechanical effects in kaolinite. Part 1： prepared samples[J]. Geotechnique，2011，61(6)：439–447.
[9]	WAHID A S，GAJO A，MAGGIO D．Chemo-mechanical effects in kaolinite. Part 2：exposed samples and chemicaland phase analyses[J]. Geotechnique，2011，61(6)：449–457.
[10]	顾季威. 酸碱废液侵蚀地基土对工程质量的影响[J]. 岩土工程学报，1988，10(4)：72–78.(GU Jiwu. Effect of acid-base waste liquid eroded foundation soil on engineering quality[J]. Chinese Journal of Geotechnical Engineering，1988，10(4)：72–78.(in Chinese))
[11]	单慧媚，彭三曦，梁和成，等. 紫红色松散土体在不同饱水环境中的化学反应特征试验研究[J]. 水文地质工程地质，2018，45(5)： 136–142.(SHAN Huimei，PENG Sanxi，LIANG Hecheng，et al. A test study of the characteristics of chemical reaction between purple unconsolidated soil and water in different saturated environment[J]. Hydrogeology and Engineering Geology，2018，45(5)：136–142.(in Chinese))
[12]	VAN OLPHEN H，HSU P H. An introduction to clay colloid chemistry[J]. Soil Science，1978，126(1)：59.
[13]	MITCHELL J K，SOGA K. Fundamentals of soil behavior[M]. New York：Wiley，1976：154–155.
[14]	孔令伟，吕海波，汪稳，等. 海口某海域软土工程特性的微观机制浅析[J]. 岩土力学，2002，23(1)：36–40.(KONG Lingwei，LV Haibo，WANG Wen，et al. Preliminary analysis of micro-mechanism of engineering properties for soft soil in a sea area of Haikou[J]. Rock and Soil Mechanics，2002，23(1)：36–40.(in Chinese))
[15]	吴恒，代志宏，张信贵，等. 水土作用中铝对土体结构性的影响[J]. 岩土力学，2001，22(4)：474–477.(WU Heng，DAI Zhihong，ZHANG Xingui，et al. The influence of aluminium on the soil structural characteristics in the soil-water interaction[J]. Rock and Soil Mechanics，2001，22(4)：474–477.(in Chinese))
[16]	邱长林，闫澍旺，孙立强，等. 孔隙变化对吹填土地基真空预压固结的影响[J]. 岩土力学，2013，34(3)：631–638.(QIU Changlin，YAN Shuwang，SUN Liqiang，et al. Effect of varying void on consolidation of dredger fill under vacuum preloading[J]. Rock and Soil Mechanics，2013，34(3)：631–638.(in Chinese))
[17]	CHEN K. Impact of land reclamation on hydrogeochemical processes in coastal aquifer systems：a case study in Shenzhen，China[Ph. D. Thesis][D]. HongKong：The University of HongKong，2008.
[18]	雷华阳，许英刚，李鑫. 聚丙烯酰胺改性石灰固化吹填土固结特性研究[J]. 岩土工程学报，2017，39(增2)：107–111.(LEI Huayang，XU Yinggang，LI Xin. Experimental study on consolidation characteristics of polyacrylamide modified lime stabilized dredger fill[J]. Chinese Journal of Geotechnical Engineering，2017，39(Supp.2)：107–111.(in Chinese))
[19]	杨爱武，周金，孔令伟. 天津滨海新区吹填软土固化试验研究[J]. 岩土力学，2013，34(9)：2 442–2 448.(YANG Aiwu，ZHOU Jin，KONG Lingwei. Experimental study of solidification of soft dredger fill in Tianjin Binhai New Area[J]. Rock and Soil Mechanics，2013，34(9)：2 442–2 448.(in Chinese))
[20]	赵森，曾芳金，王军，等. 絮凝–真空预压加固吹填淤泥试验研究[J]. 岩石力学与工程学报，2016，35(6)：1 291–1 296.(ZHAO Sen，ZENG Fangjin，WANG Jun，et al. Experimental study of flocculation combined with vacuum preloading to reinforce silt foundation[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(6)：1 291–1 296.(in Chinese))
[21]	戴绍斌，黄俊，夏林. 鄂北膨胀土的矿物组成和化学成分分析[J]. 岩土力学，2005，26(增1)：296–299.(DAI Shaobin，HUANG Jun，XIA Lin. Analysis of mineral composition and chemical components of expansive soil in North Hubei[J]. Rock and Soil Mechanics，2005，26(Supp.1)：296–299.(in Chinese))
[22]	杜东菊，杨爱武. 天津滨海吹填土[M]. 北京：科学出版社，2010：21–23.(DU Dongju，YANG Aiwu. Dredger fill in Tianjin Binhai[M]. Beijing：Science Press，2010：21–23.(in Chinese))
[23]	中华人民共和国行业标准编写组. SL237—1999 土工试验规程[M]. 北京：中国水利水电出版社，1999.(The Professional Standards Compilation Group of People?s Republic of China. SL237—1999 Specification of soil test[M]. Beijing：China Water Conservancy and Hydropower Press，1999.(in Chinese))
[24]	高国瑞. 近代土质学[M]. 北京：科学出版社，2013：64–68.(GAO Guorui. Neoteric soil geotechnology[M]. Beijing：Science Press，2013：64–68.(in Chinese))