采用不同比例天然细粒土与建筑中沙混合,湿法制作了4组24个传统土坯试件.通过土坯立面抗压强度试验,分析了细粒含量、干密度和高宽比对抗压强度的影响,以及细粒含量与体积收缩率间的关系.结果表明:立面单轴抗压试验中土坯存在轴压、剪切、局压3种破坏形式；随着细粒含量的增加,体积收缩率单调增加,而抗压强度则先增而后降；干密度的增加与土坯抗压强度的提高呈抛物线关系；当高宽比在2.5 ～4的区间内,土坯试件能获得相对稳定的抗压强度.试验和分析也同时证明,含砂量较低的细粒土质沙是一种适宜制作生土土坯的土料.%In this study, 4 series of adobe samples are prepared by mixing fine grained soil and sand in proportions. Through the tests on the unconfined compressive strength, the influence of fine grain content, dry density and aspect ratio on compressive strength, the relation of fine grain content and volumetric shrinkage are discussed. The results show that adobe samples are failed in three modes, i. e. , axial compression, shear and local compression failures; as fine grain content increases, volumetric shrinkage increases and compressive strength increases then decreases; the relation of dry density and compressive strength behaves parabolic; compressive strength is stable with the aspect ratio of 2. 5 ~ 4. Based on experiments and analysis, fine grain sand with low sand content is appropriate to make adobes.
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