雷州半岛玄武岩残积土的工程地质特性研究

张先伟; 孔令伟; 臧濛

doi:10.11779/CJGE201405007

雷州半岛玄武岩残积土的工程地质特性研究 English Version

张先伟^{1, 2},
孔令伟¹,
臧濛¹

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. 同济大学岩土及地下工程教育部重点实验室,上海 200092

基金项目: 湖北省自然科学基金项目（2011CDB406）; 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）

详细信息

作者简介:
张先伟 (1982- ),男,黑龙江省龙江人,博士,助理研究员,从事特殊土的力学特性研究。E-mail: xwzhang@whrsm.ac.cn。

中图分类号: TU446
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出版历程
- 收稿日期: 2013-09-22
- 发布日期: 2014-05-20

Engineering geological characteristics of basalt residual soils in Leizhou Peninsula

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

摘要

摘要: 雷州半岛玄武岩残积土属于区域性特殊土,全面系统地评价玄武岩残积土的工程地质特性对于该地区建设、地质工程勘察具有重要指导意义。玄武岩残积土是由玄武岩经过长期缓慢的风化分解与红土化作用形成,土层分布具有上细下粗的结构特征。黏土矿物以高岭石类为主,含有较多的游离氧化铁、铝。微观结构以凝块和絮凝结构为主,粒径小于1 μm的微孔占总孔隙70%以上。特殊的物质构成与结构形态导致其具有高孔隙率、低密度、高液限的物理特性,但强度较高的力学特征。该土的膨胀性小,但收缩性较大,夯击压实效果差,抗水性差,浸水饱和后力学性质劣化明显,同时对温度与湿度等环境因素敏感,在炎热多雨的气候影响下,颗粒间胶质容易发生脱水老化,导致结构强度减损,微观尺度上结构扰动、破坏,遇水产生严重的崩解现象与较大的湿陷变形,实际工程应关注强收缩势与降雨积水引发的工程灾害。
- 雷州半岛 /
- 玄武岩残积土 /
- 工程特性 /
- 微观结构 /
- 矿物成分
Abstract: The basalt residual soil in Leizhou Peninsula is special regional soil. Comprehensive and systematic evaluation of engineering geological characteristics of the basalt residual soil can provide a certain theoretical support for its engineering investigation and construction. It is formed from the basalt by a long period of weathering and laterization, and the soil particles in the upper layer are smaller than those in the lower layer. Its clay mineral is mainly kaolin, furthermore, it contains more free iron oxide and free aluminium oxide. Its microstructure is mainly clot and flocculation structure, and the pores with a size of greater than 1 μm are more than 70% of the total porosity. The basalt residual soil has poor physical properties of high porosity, low density, high liquid limit and possesses better mechanical properties of high strength because of special composition and microstructure. The basalt residual soil has small expansibility, great shrinkage, insignificant tamping compatibility, and poor water resistance, and its mechanical properties are deteriorated significantly after immersion in water. And the basalt residual soil is more sensitive to the environmental factors such as temperature and humidity. The cementing materials of skeleton will dehydrate and exhibit aging in hot and wet climate, and thus their structural strength is weakened and microstructure is disturbed and damaged. The soils after immersion show serious disintegration and large collapsible deformation. Therefore, geotechnical engineers should pay close attention to engineering disasters due to strong shrinkage and meteoric water.
- Leizhou Peninsula /
- basalt residual soil /
- engineering characteristic /
- microstructure /
- mineral composition

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参考文献(24)

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雷州半岛玄武岩残积土的工程地质特性研究 English Version

作者简介: 张先伟 (1982- ),男,黑龙江省龙江人,博士,助理研究员,从事特殊土的力学特性研究。E-mail: xwzhang@whrsm.ac.cn。

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Engineering geological characteristics of basalt residual soils in Leizhou Peninsula

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作者简介:
张先伟 (1982- ),男,黑龙江省龙江人,博士,助理研究员,从事特殊土的力学特性研究。E-mail: xwzhang@whrsm.ac.cn。