粗粒土的路用性能试验研究

Experiment on Road Property of Thick Granule Soil

为研究粗粒土的路用性能,采用自行研制的大型击实仪对不同粗颗粒质量分数、级配、击实方法及击实功情况下的粗粒土进行系统的击实试验,并对不同粗颗粒质量分数的粗粒土开展无侧限抗压强度、CBR及回弹模量试验,结果表明:粗粒土的级配在泰勒理想级配范围内,其压实性能最好,且压实过程中,击实功不易太大,否则易使粗粒土的级配退化;在实际工程中,最好选用大型击实法来确定粗粒土的最大干密度,否则会降低压实标准;粗粒土的力学性能较好,且浸水后膨胀量小于一般细粒土的膨胀量。

In order to study the engineering mechanics property of the thick granule soil, systematic tests are made on the thick granule soil in the condition of different coarse aggregate contents, grading, factured test are compacting effort and compacting method by use of the large-scale compaction device manuindependently, and the unconfined compressive strength test, CBR test, compression modulus made on the thick granule soil of different coarse aggregate contents. The test results show that when the grading of the thick granule soil is in the range of Tailor grading, the compacting character is good, and the compacting efforts are too large to make the grading of the thick granule soil degradation in the course of the compaction. In the course of construction, the maximum dry density of the thick granule soil is determined by use of the large-scale compaction method, otherwise the compacting standard would be reduced. The mechanics property of the thick granule soil is excellent, and the swell increment of immersion of the thick granule soil is smaller than that of the fine-grained soil.