风积沙的压实特性研究

Study on Compaction Characteristics of Aeolian Sand

风积沙是一种特殊的路基材料,其密实程度对公路使用耐久性起着至关重要的作用。风积沙工程特性差,其压实工艺一直是公路施工中的难题,通过击实试验、干振试验和水振试验研究了风积沙的压实特性。试验得到击实试验曲线与常规工程材料显著不同,呈一个特殊的横写S型,干密度随含水率变化有两个峰值,即沙在含水率为0和最优含水率下,均可被压实;干振试验和水振试验表明在固定的振动频率和振幅下,沙体的干密度随时间增长存在一个峰值,达到峰值时的振动时间约为4 min^6min。通过试验对比分析可知,风积沙在水中振动能够达到最大限度的密实。

As aeolian sand is a particular kind of subgrade material ,its compaction degree plays a major role in highway durability .Because of the poor engineering properties of aeolian sand ,its compaction technology is always a major prob-lem in highway construction .The compaction test ,dry vibration test and water vibration test are used here to study the compaction characteristics of aeolian sand .Unlike conventional engineering materials ,the compaction curve shows a spe-cial transverse S type ,and the dry density has two peaks along with the change of water content ,that is ,the aeolian sand can be compacted under the best moisture content and when the moisture content is 0 .The dry vibration test and water vibration test show that the dry density of sand has one peak under the fixed vibration frequency and amplitude ,and the time of vibration is about 4 min^6 min .Through experimental comparison and analysis ,it is known that the aeolian sand can achieve the maximum dense in water vibration .