The paper undertakes the triaxial test on the unsaturated soil in Luoyang area with improved unsaturated soil triaxial apparatus,and undertakes the analysis and research on the influence of the soil and water characteristic and specimen reconstruction on matric suction,proves by the research that the matric suction of the trial didn＇t have the linear reduction along with the increasing confining pressure,the matric suction has the continuous reduction along with the increasing saturation,and the relationship between the saturation and the matric suction is continuous.%在改进的非饱和土三轴仪上对洛阳地区非饱和土开展了三轴试验,并依此对非饱和土土水特性、试样重塑对基质吸力的影响进行了分析研究。研究表明：试件的基质吸力随围压的增大而非线性减小,基质吸力随饱和度的增大而连续减小,饱和度与基质吸力的关系是连续的。
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