龙马溪组页岩特性及用作高速公路路基填料的试验研究

对渝东南龙马溪组黑色页岩的地质构造、矿物组成、结构特征、工程特性和用作公路路基填料的适应性进行试验研究。结果表明:龙马溪组黑色页岩室内状态崩解性差，而干湿交替环境下易风化崩解破碎，不能用作过湿土路基的基底换填材料；尽管页岩大部分的物理力学指标满足现行规范对路基填料的相关要求，但其饱和单轴抗压强度不能满足路床填料的强度要求；试验路段验证结果显示岩块颗粒间黏结性差，碾压后的岩屑碎块不易固（板）结；承受路面荷载后，岩块颗粒间易发生错动，尤其是潮湿环境下，更易出现粒间错动，因此，该种页岩不能直接用作路床填料。

Experimental Research on Characteristics of Longmaxi Formation Shale and Its Adaptability as Highway Subgrade Filler

The geological structure, mineral composition, structural features, engineering properties of black shale of Longmaxi Formation in Southeast Chongging, and its adaptability as subgrade filler were studied experimently. The result shows that Longmaxi Formation black shale is of poor disintegration under indoor conditions, and breakable as a result of weathering and disintegration in dry-wet cycling, thus it can not be used as base filling for over wet subgrade; although most of its physical and mechanical properties are in line with the current specifications, the saturated uniaxial compressive strength can not meet the requirements of roadbed filler; the result of tests in test section demonstrates the poor bondability between the rock particles and the fragments after rolling are not easy to be consolidated(hardened); when exposure to pavement load, there is prone to dislocation between the particles, especially in humid environment, the intergranular dislocation is easier to come out. Above all, Longmaxi Formation shale can not be used as roadbed filler directly.