雷州半岛玄武岩残积土的物质成分与结构特征

张先伟; 李晶晶; 李峻; 张静

doi:10.13544/j.cnki.jeg.2014.05.04

雷州半岛玄武岩残积土的物质成分与结构特征

doi: 10.13544/j.cnki.jeg.2014.05.04

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武汉 430071;
2.
同济大学岩土及地下工程教育部重点实验室上海 200092;
3.
辽宁省地质环境监测总站沈阳 110032

基金项目:

湖北省自然科学基金（2011CDB406）和岩土及地下工程教育部重点实验室（同济大学）开放课题（KLE-TJGE-B1103）资助

详细信息

作者简介:
张先伟（1982- ），男，博士，助理研究员，主要从事特殊土的力学特性研究. Email: xwzhang@whrsm.ac.cn

中图分类号: TU411
计量
- 文章访问数: 3591
- HTML全文浏览量: 230
- PDF下载量: 607
- 被引次数: 0
出版历程
- 收稿日期: 2014-03-28
- 修回日期: 2014-06-29
- 刊出日期: 2014-10-25

STRUCTURE AND COMPOSITION OF RESIDUAL SOIL FROM DECOMPOSED BASALT AT LEIZHOU PENINSULA

1.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071;
2.
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092;
3.
Liaoning Geological Environmental, Shenyang 110032

摘要

摘要: 雷州半岛玄武岩残积土属于区域性特殊土，具有高液限、大孔隙比的较差的物理特性和高强度的较优的力学特性的异常组合，同时具有强收缩性、遇水湿化、易崩解的特殊性质。为探寻玄武岩残积土特殊的工程地质特性的机理，对其矿物成分、化学成分、结构形态、孔隙分布进行研究。结果表明，雷州半岛玄武岩残积土发育过程经历明显的富铝化、铁富集和盐淋失过程，黏土矿物以高岭石、三水铝石和伊利石为主，富含游离氧化铁、铝成分；微观结构类型为凝块结构和絮凝结构，游离氧化铁作为胶结物质以包膜形式包裹颗粒形成团聚体，增强了土的结构强度；孔隙以溶蚀孔隙以及团粒和絮凝体内微孔为主，微孔具有较大的比表面积和吸附能，吸水会产生较大的表面张力，引发软化、崩解现象。由于雷州半岛玄武岩残积土具有对水敏感，抗水性差特点，施工中应重点关注降雨引发的工程灾害。
- 玄武岩残积土 /
- 雷州半岛 /
- 物质成分 /
- 结构 /
- 氧化铁
Abstract: Residual soil from decomposed basalt at Leizhou Peninsula is special regional soil. It has poor physical properties of high liquid limit and large void ratio, good mechanical properties of high strength, and extraordinary properties of strong contractility, humidification and disintegration. This paper attempts to examine the mechanism of the special engineering geological characteristics of the basalt residual soil. It studies the mineral composition, chemical composition, structure, and pore distribution from laboratory tests. Results show that distinct aluminum, iron accumulation, and salt leaching processes occur during the development process of the basalt residual soil. Clay minerals are mainly composed of kaolinite, gibbsite and illite. Furthermore, they are rich in free iron oxide and free aluminum oxide. Microstructure is mainly clot and flocculation structure. The free iron oxide acts as coating that clads particles to form aggregate, which enhances structural strength of soil. Pores mainly consist of denudation pores and micropores in the aggregate and flocculation, and with larger specific surface area and adsorption energy. Large surface tension occurs after immersion which leads to softening and disintegration. Therefore, close attention should be paid to engineering disasters caused by rainfall due to the water sensitive and poor water resistance of the basalt residual soil.
- Basalt residual soil /
- Leizhou peninsula /
- Composition /
- Structure /
- Iron oxide

HTML全文

参考文献(1)

[1] 唐大雄, 王清,张庆云,等. 雷琼地区玄武岩残积红土的工程地质研究[J]. 长春地质学院学报, 1992, 22 (3): 317～323.

Tang Daxiong, Wang Qing, Zhang Qingyun, et al. Engineering geological study of residual laterite soil of basalt in Leiqiong region[J]. Journal of Changchun University of Earth Sciences, 1992, 22 (3): 317～323.

[2] 王国华, 陈海明. 雷州半岛玄武岩残积土工程特性试验[J]. 华北水利水电学院学报, 2011, 32 (3): 67～71.

Wang Guohua, Chen Haiming. Experimental study on engineering properties of residual soil of basalt in Leizhou peninsula[J]. Journal of North China Institute of Water Conservancy and Hydroelectric Power, 2011, 32 (3): 67～71.

[3] 劳国利. 海南岛土类的分布概况及物理力学特性[J]. 岩土力学, 1988, 9 (4): 51～61.

Lao Guoli. Distribution survey of soils in the Hainan Island and their physic-mechanical properties[J]. Rock and Soil Mechanics, 1988, 9 (4): 51～61.

[4] Gutierrez N H, Nóbrega M T, Vilar O M. Influence of the microstructure in the collapse of a residual clayey tropical soil[J]. Bulletin of Engineering Geology and the Environment, 2009, 68 (1): 107～116.

[5] Lohnes R A, Demirel T. Geotechnical properties of residual tropical soils[C]. Proc. ASCE Convention, Huston, Texas: 1983, 150～166.

[6] 鲁如坤. 土壤农业化学分析方法[M]. 北京,中国农业科技出版社, 1999.

Lu Rukun. Analysis of soil agricultural chemistry[M]. Beijing: China Agriculture Science and Technology Press, 1999.

[7] Sparks D L, Page A L, Loeppert P A. et al. Methods of soil analysis part 3:chemical methods. Soil Science Society of America and American Society of Agronomy, Madison, WI.1996.

[8] 张乃娴, 李幼琴,赵慧敏,等. 黏土矿物研究方法[M]. 北京:科学出版社, 1990.

Zhang Naixian, Li Youqin, Zhao Huimin, et al. Research methods of clay minerals[M]. Beijing: Science Press, 1990.

[9] 蒋梅茵, 杨德湧. 玄武岩发育的几种红壤的矿物特征[J]. 土壤学报, 1991, 28 (3): 268～275.

Jiang Meiyin, Yang Deyong. Mineralogical properties of several red earths developed from basalt[J]. Acta Pedologica Sinica, 1991, 28 (3): 268～275.

[10] 张先伟, 孔令伟,王静. 针对黏性土胶质联结特征的SEM-EDS试验研究[J]. 岩土力学, 2013, 34 (增2): 195～203.

Zhang Xianwei, Kong Lingwei, Wang Jing. Experimental study of SEM-EDS for cementation bond characteristics of Zhanjiang clay[J]. Rock and Soil Mechanics, 34 (S2): 195～203.

[11] Gasparatos D, Haidouti C, Tarenidis D. Characterization of iron oxides in Fe-rich concretions from an imperfectly drained Greek soil: A study by selective dissolution techniques and X-ray diffraction. Archives of Agronomy and Soil[J], 2004, 50 (4-5): 485～493.

[12] 高国瑞. 中国红土的微结构和工程性质[J]. 岩土工程学报, 1985, 7 (5): 10～21.

Gao Guorui. The microstructures and engineering properties of red soil in China[J]. Chinese Journal of Geotechnical Engineering, 1985, 7 (5): 10～21.

施引文献

资源附件(0)

访问统计