摘要
从颗粒物质的角度探讨了风积沙的压实特性和机理。研究表明,风积沙的重型击实试验曲线呈"双驼峰"形式,表明风积沙具有干压实的特性,水在风积沙的压实过程中扮演着不同的作用;室内振动试验表明振动加速度及振动时间影响着风积沙"巴西坚果效应"与"反巴西坚果效应"之间的转化,从而影响风积沙的振实密度,二者均存在一个产生最大振实干密度的最优值。现场试验通过控制机械参数(振幅A=0.4mm,频率f=48Hz)在压实5遍的时候,可使压实度达到96.8%,CBR值达到25.3,均能满足《公路路基设计规范》要求。
This paper takes aeolian sand as a kind of granular matter and studies its compaction characteristics in the view of granular material.According to the results of the laboratory compaction tests,a compaction curve is plotted which is quite different from that of clay and looks like a double hump in shape.The two peaks in the curve mean that aeolian sand can be well-compacted whether it is dry or contented some water and water plays different parts in the compaction process.According to the results of vibrating compaction test,it can be known that it is vibration acceleration and vibration time that affect the transform between Brazil-nut effects and anti-Brazil-nut effects,which also affect the compaction density.There are optimization values for both vibration acceleration and vibration time in that condition.A optimized compaction density can be acquired.Also,field compaction tests were carried out（the amplitude of the machine was 0.4mm and the frequency was 48 Hertz）.When the roadbed was compacted 5 times,the degree of compaction was 96.8%and the value of CBR was 25.3,which are quite acceptable according to the current specifications or design of highway subgrades.
出处
《工程地质学报》
CSCD
北大核心
2010年第5期692-697,共6页
Journal of Engineering Geology
关键词
颗粒物质
风积沙
压实机理
重型击实
振动压实
Granular matter
Aeolian sand
Compaction mechanism
Weighty tamping
Vibration compaction
Subgrade
Pavement
