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中文摘要：
以吉林省靖宇县的黑色、红色两种火山灰为原材料，分别配制了5种不同级配的试样．通过土粒相对密度、矿物成分与颗粒形态、直接剪切和固结试验分析，得到该火山灰材料的土粒相对密度、化学成分、颗粒形态、剪切强度、压缩性等物理力学特性，并分析了5种级配的中值粒径d50和不均匀系数cu对火山灰剪切强度的影响．靖宇火山灰主要由泡沫状的火山玻璃组成，未经历过长期水力、风力的磨圆作用，颗粒棱角分明，其剪切特性与干沙土类似，内聚力很小，剪切强度受级配的影响较大．在配制的5种级配曲线的粒径范围，试样的内摩擦角随着中值粒径d50的增大而增大，不均匀系数cu对试样内摩擦角的影响较小．
英文摘要：
Originated from two kinds of volcanic ashes from Jingyu County, Jilin Province, five samples are prepared according to different grain size distribution. The specific gravity, mineralogy chemical composition, particle shape are examined in laboratory. The shear strength and compressibility of those samples are tested by direct shear tests and one dimension consolidation tests, and the influence of grain size distribution on shear strength and compressibility is also analyzed. Volcanic ashes in Jingyu County are mainly composed of volcanic glass, and the particles are angular because they have never experienced a long term hydro power or wind rounding. The shear properties are similar to that of dry sand with low cohesion and the shear strength is influenced greatly by grain size distribution. The internal friction angle of the samples increases with the increase of median grain size d50, but is less influenced by the nonuniform coefficient cu.
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