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

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (750 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要化学环境的变化对吹填土的力学性质及微观特征影响显著。利用不同掺量NaOH的吹填土试样进行室内直剪试验、三轴剪切试验和一维压缩试验，探讨碱性环境对吹填土强度和变形特性的影响，并对碱性环境下吹填土的微观结构特征进行研究。试验研究结果表明：由于碱性环境中生成的难溶物对粒间胶结强度的增强作用，抗剪强度平均提高15.1～79.3 kPa，结构屈服应力提高5～169 kPa；碱性环境中，吹填土的应力–应变关系由应变硬化型转变为应变软化型为主，压缩性大幅度降低，压缩指数的最大降低幅度达到60.3%。微观试验表明，碱性环境中吹填土的粒间胶结物发育良好，颗粒形态由粒状结构和片状结构过渡为团粒结构，粒间连接形式以面–面接触为主。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	雷华阳1
	2
	王磊1
	屠慈科1
	韩均3
	冀智勇3

关键词 ：土力学, 吹填土, 碱性环境, 直剪试验, 三轴试验, 压缩试验, 微观特征

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

引用本文:

雷华阳1，2，王磊1，屠慈科1，韩均3，冀智勇3. 碱性环境下吹填土的力学特性及微观机制分析[J]. 岩石力学与工程学报, 2019, 38(S2): 3849-3858.
LEI Huayang1，2，WANG Lei1，TU Cike1，HAN Jun3，JI Zhiyong3. Analysis of mechanical properties and microscopic mechanism of dredger fill in alkaline environment. , 2019, 38(S2): 3849-3858.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.1113 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS2/3849

[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))
[12]	VAN OLPHEN H，HSU P H. An introduction to clay colloid chemistry[J]. Soil Science，1978，126(1)：59.
[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))
[4]	BOLT G H，MILLER R D. Compression studies of illite suspensions[J]. Soil Science Society of America Journal，1955，19(3)：285–288.
[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))
[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))
[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.
[8]	WAHID A S，GAJO A，MAGGIO D. Chemo-mechanical effects in kaolinite. Part 1： prepared samples[J]. Geotechnique，2011，61(6)：439–447.
[13]	MITCHELL J K，SOGA K. Fundamentals of soil behavior[M]. New York：Wiley，1976：154–155.
[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))
[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))
[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))
[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))
[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.
[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))
[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))
[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))
[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.
[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))
[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))
[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))
[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))
[1]	GRATCHEV I，TOWHATA I. Compressibility of natural soils subjected to long-term acidic contamination[J]. Environmental Earth Sciences，2011，64(1)：193–200.
[3]	BOLT G H．Physical-chemical analysis of the compressibility of pure clay[J]. Geotechnique，1956，6(2)：86–93.