冲击荷载作用后土压缩性状的室内试验研究

在侧限条件下,对粉砂和两种不同饱和度的粉质粘土进行冲击试验和冲击后的高压固结试验,研究冲击产生的压密、冲击后的压缩曲线和压缩指数、冲击形成的前期固结压力及其与冲击能的关系。结果表明,相近初始密实度下,低饱和粉质粘土密实效果最好;冲击后近饱和粉质粘土基本不形成超固结,低饱和粉质粘土形成明显的超固结,冲击形成的前期固结压力随着冲击能增大而增大;冲击后土的压缩指数与冲击能相关性不大。

Laboratory Research on the Soil Compression Behaviour after Impact

Impact tests and high pressure oedometer tests after impact were conducted on silty sands and fine-grained soil of different saturation degrees under confined compression conditions.The soil densification under impact,the compression curve and compression index after impact,as well as the preconsolidation pressure formed during impact and its relationship with impact energy,were investigated.Results show that,the densification of lower saturated silty clay is better than other soils with similar initial density;the over-consolidation does not occurs basically in nearly saturated cohesive soil and occurs obviously in unsaturated cohesive soil;the preconsolidation pressure increases with increase of impact energy;little correlation occurs between compression index and impact energy.