广西原状红粘土力学性状与水敏性特征

›› 2003, Vol. 24 ›› Issue (4): 568-572.

广西原状红粘土力学性状与水敏性特征

赵颖文，孔令伟，郭爱国，拓勇飞

中国科学院武汉岩土力学研究所岩土力学重点实验室，湖北武汉 430071

收稿日期:2002-12-17 出版日期:2003-08-11 发布日期:2014-08-19
作者简介:赵颖文，男，1978年生，岩土工程硕士研究生，主要从事特殊土力学研究。
基金资助:
国家自然科学基金资助项目 (批准号19902018)

Mechanical behaviors and water-sensitive properties of intact Guangxi laterite

ZHAO Ying-wen, KONG Ling-wei, GUO Ai-guo, TUO Yong-fei

Key Laboratory of Rock and Soil Mechanics, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Received:2002-12-17 Online:2003-08-11 Published:2014-08-19

摘要/Abstract

摘要： 对广西原状红粘土的力学指标、胀缩特性与孔径分布随脱湿过程的演化规律进行了较为系统的室内试验研究。结果表明：广西原状红粘土为裂隙发育的硬塑性粘土，不同脱湿阶段的力学指标与胀缩性能在较高含水量范围内受基质吸力控制，在较低的含水量范围内主要受控于裂隙性；转折点处含水量与重型击实(干法备样)最优含水量相接近；原状红粘土的孔隙主要以孔径从0.01 μm～0.05 μm的小孔隙为主，在脱湿过程中，干密度增大，总孔隙体积减小，以0.01 μm～0.05 μm与0.1 μm～1.0 μm两个区间内孔隙体积减小最为明显。

关键词: 红粘土, 力学特性, 裂隙性, 胀缩性, 基质吸力, 孔径分布

Abstract: An experimental research on the mechanical indexes, swelling-shrinkage properties and pore size distributions of intact Guangxi laterite at different stages of dehydration, has been carried out systematically. The results reached are that, Guangxi laterite is a kind of stiff-plastic clay with well-developed fissures, and the mechanical indexes and swelling-shrinkage properties of intact samples are mainly controlled by the matrix suction during the relative high range of moisture content, while by the fissures instead during the relative low range of moisture content; additionally, the moisture content of the turning points are close to the optimum moisture content of heavy-duty compaction tests; the pores of intact Guangxi laterite are mainly small pores with diameters from 0.01 μm to 0.05 μm, during the process of dehydration, the dry density increases, the total pore size volume decreases, and the pores with diameters from 0.01 μm to 0.05 μm and from 0.1 μm to 1.0 μm represent the most obvious decrease in volume.

Key words: laterite, mechanical properties, fissure, swelling-shrinkage properties, matrix suction, pore size distribution

中图分类号:

TU 44

赵颖文，孔令伟，郭爱国，拓勇飞. 广西原状红粘土力学性状与水敏性特征[J]. , 2003, 24(4): 568-572.

ZHAO Ying-wen, KONG Ling-wei, GUO Ai-guo, TUO Yong-fei. Mechanical behaviors and water-sensitive properties of intact Guangxi laterite[J]. , 2003, 24(4): 568-572.

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