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 靘～0.05 靘的小孔隙为主,在脱湿过程中,干密度增大,总孔隙体积减小,以0.01 靘～0.05 靘与0.1 靘～1.0 靘两个区间内孔隙体积减小最为明显。
An experimental research on the mechanical indexes, swelling-shrinkage properties and pore size distributions of intact Guangxi laterite at different stages of dehydration was carried out. 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 controlled by the fissures instead during the relative low range of moisture content. 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 of 0.01-0.05 μm. During the process of dehydration, the dry density increases, the total pore size volume decreases, and the pores with diameters of 0.01-0.05 μm and of 0.1-1.0 μm represent the most obvious decrease in volume.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2003年第4期568-572,共5页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目 (批准号19902018)
