不同击实功对固化底泥力学性能的影响及微观作用机理的研究

Study on the Influence of Different Compaction Work on Mechanical Properties of Solidified Sediment and Its Microscopic Mechanism

以浙江省嘉兴市连三连四荡底泥为研究对象,以粉煤灰、水泥为主固化剂对其进行固化处理。通过无侧限抗压强度试验,重点研究最优含水率34%的土样掺加最佳比例8%的固化剂后,不同击实功对固化底泥力学性能的影响规律;利用扫描电子显微镜(SEM)对所得规律进行解释并分析其微观作用机理。研究结果表明:最优含水率条件下掺加最佳比例固化剂的固化土,当击实功较小时,固化土强度和干密度都随击实功的增大而增大,击实功较大时,固化土强度和干密度反而会降低,因此击实功存在一个最佳值。

In this paper,the Lian-san-Lian-si Lake sediment in Jiaxing City,Zhejiang Province are selected as the research object.The cement and fly ash are the main curing agents for curing the sediment.Through the unconfined compressive strength test,the effect of different compaction work on the mechanical properties of solidified bottom mud after adding 8%curing agent to soil sample with optimal moisture content of 34%was studied.SEM(scanning electron microscope)experiment was used to explain the obtained rule and analyze its microscopic mechanism of action.The research results show that:If the optimal moisture content and the optimal proportion of curing agent are added to the solidified soil,the strength and dry density of the solidified soil increase with the increase of the compaction work when the compaction work is small,but the strength and dry density of the solidified soil will decrease when the compaction work is large,so there is an optimal value of the compaction work.