风积沙振动荷载地基加固性能分析方法

Analysis Method of Foundation Reinforcement Performance under Vibration Load of Aeolian Sand

风积沙稳定性差、黏聚力低,严重影响基础建筑在风区域建设的安全性与稳定性,因此分析风积沙振动荷载地基加固性能。从塔克拉玛干大沙漠采集天然风积沙样本,调配含水率分别为3.5%与5.5%的A组(A0~A3)和B组(B0~B3)两种风积沙,且两组风积沙的水泥含量分别为0%、2.5%、5.5%、9.5%,最终得到两组不同的水泥固化风积沙地基试件实验样本。利用加载装置对各试件加载振动荷载,统计时间抗振荷载能力以及其他相关性能。结果显示,含水率是3.5%的试件剪切应力更强、黏结性能更高,经水泥固化后孔隙量效果更好;振动荷载实验中,含水率为3.5%、水泥含量5.5%的试件荷载承受能力更优,相同水泥用量的情况下,含水率越高的时间抗振承载力水平越高。

The aeolian sand has poor stability and low cohesion,which seriously affects the safety and stability of the foundation construction in the wind area.Therefore,the reinforcement performance of the foundation under the vibration load of aeolian sand is analyzed.Natural aeolian sand samples were collected from the Taklimakan desert,and two kinds of aeolian sand samples were mixed with water content of 3.5%and5.5%,Group A(A0-A3)and Group B(B0-B3)respectively and the cement contents of the aeolian sand in the two groups were 0%,2.5%,5.5%and 9.5%,respectively.Finally,two groups of different cement solidified aeolian sand foundation test samples were obtained.The loading device was used to introduce the vibration load on each specimen,and the time anti-vibration load capacity and other related properties were analyzed.The results show that the specimen with 3.5%water content has stronger shear stress,higher bonding property and better pore quantity effect after cement curing.In the vibration load test,the load bearing capacity of the specimens with 3.5%water content and 5.5%cement content is better.Under the same cement dosage,the higher the water content is,the higher the time vibration bearing capacity.