固化海积淤泥土强度发展规律试验研究

Study on Test of Strength Development of Solidified Marine Silt

浙东沿海地区广泛分布吹填淤泥土,为解决真空预压难以快速提高淤泥土地基承载力的问题,提出使用固化剂加固沿海地区海积淤泥地基的方法,对含水率不低于85%的吹填土进行固化试验,比较了固化剂的种类、掺量及费用,分析了固化土强度发展规律。结果表明,3%石灰-8%粉煤灰类固化土对高含水率海积淤泥的固化效果较为明显,且方案最优,强度费用比为4.2,并得到了固化淤泥土的无侧限抗压强度与龄期之间的对数关系,28d内强度增长较快,确定该类固化土后期外掺剂试验以28d强度为主要参考点。研究成果可为海积淤泥土地基的加固提供试验数据支撑。

At present,using vacuum preloading is difficult to improve the bearing capacity of foundation soil,and Zhejiang coastal area faces sandstone shortage.This paper put forward a way to consolidate coastal foundation with curing marine mud.Through comparison of the solidified marine silt’s solidification effect and cost,it proved that the lime-fly ash stabilized soil,which was 3%lime mixed 8%fly ash,was the optimal plan.Its intensity cost ratio was 4.2.At the same time,this paper analyzed the solidified soil development law of strength and age,and proposed Logarithmic relationship between unconfined compressive strength and age.It proved that this solidified marine silt’s 28 dcompression strength increased quickly,which can provide data support for the consolidate of marine mud foundation test.