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高液限红黏土用于路基填筑时,因其不良的水理特性,需要掺石灰或水泥改良。但红黏土成团现象十分突出,进行灰土拌和时不易达到均匀状态,影响预期改良效果。通过对不同直径的红黏土土团及石灰改良土土团进行承载比试验,结果表明:干密度随着土团直径尺寸的增大呈现先增大后减小的特征,红黏土和石灰土的最大干密度对应的土团直径处在0.2～5 mm范围内;而最大承载比CBR值对应的土团直径分别处在5～10 mm和2～5 mm的范围内。石灰土和红黏土的吸水率、膨胀率均随着土团尺寸的增大,呈现先减小后增大的整体变化趋势。在2～10 mm的范围内,两种土的膨胀量最小。石灰改良只对直径小于5 mm的土团的膨胀特性起到明显的抑制作用。可见,现场施工中严格控制土团的大小对保证土体的强度和水稳定性具有十分重要的意义。
High liquid limit red clay for roadbed filling, because of its poor water quality characteristics, the need for lime or cement modified. However, the formation of a group of red clay is very prominent, when mixed with ash is not easy to reach a uniform state, affecting the expected improvement effect. The bearing ratio tests of red clay and lime soil with different diameters show that the dry density increases first and then decreases with the increase of the diameter of the soil mass. The red clay and lime soil The diameter of the soil mass corresponding to the maximum dry density is in the range of 0.2-5 mm, while the diameter of the soil mass corresponding to the CBR value is in the range of 5-10 mm and 2-5 mm, respectively. The water absorption rate and expansion rate of limestone and red clay all increase with the increase of soil size, showing the overall trend of decreasing firstly and then increasing. In the range of 2 to 10 mm, the expansion of both types of soil is the smallest. Lime improvement only significantly affected the swelling characteristics of soil masses less than 5 mm in diameter. Visible, the strict control of the size of the soil in the construction site to ensure soil strength and water stability is of great significance.