土石混合料路用工程力学性质试验

为研究土石混合料的工程力学性质,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土石混合料进行系统的击实试验,并对不同粗颗粒质量分数的土石混合料开展了无侧限抗压强度、CBR(加州承载比)及回弹模量试验。试验结果表明:土石混合料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,否则易使土石混合料的级配退化;在实际工程中,最好选用大型击实法来确定土石混合料的最大干密度,否则会降低压实标准;土石混合料的力学性能较好,且浸水后膨胀量小于一般细粒土的膨胀量。

Experiment on engineering mechanics property of earth-rock mixtures in road

In order to study the engineering mechanics property of the earth-rock mixtures,this paper made a lot of tests on the earth-rock mixtures in the condition of different coarse aggregate contents,grading,compactive works and compacting methods with the large-scale compaction device,and the unconfined compressive strength test,CBR test,resilience modulus test were made on the earth-rock mixtures with different coarse aggregate contents.When the grading of the earth-rock mixtures is in the range of Tailor grading,the compacting character is good,and the compacting works are too large to make the grading of the earth-rock mixtures degradation in the course of the compaction.In the course of construction,the maximum dry density of the earth-rock mixtures is determined by the large-scale compaction method,otherwise the compacting standard would be reduced.The mechanics property of the earth-rock mixtures is excellent,and the swell increment of the earth-rock mixtures after being immersed in water is smaller than that of the fine-grained soil.3 tabs,13 figs,8 refs.