珊瑚礁地质条件下水泥土搅拌桩抗渗性能研究

Anti-permeability of soil-cement mixing piles under coral reef geological conditions

为研究珊瑚礁特殊地质条件下水泥土搅拌桩的抗渗性能,以海南岛某基坑止水工程为背景,通过原状土室内渗透试验与现场取芯试验,获得了膨润土外加剂水泥土的抗渗变化规律。研究表明:①水泥土搅拌桩在珊瑚礁特殊地质条件下的止水工程中具有良好的适用性。②早期水泥对水泥土渗透性的影响大于膨润土,后期由于膨润土的密实效应,膨润土对渗透性能的影响大于水泥,且随着膨润土掺入量的增加,水泥土渗透系数逐渐减小,抗渗能力增强。研究成果对珊瑚礁地质中工程止水具有一定的借鉴意义。

To study the anti-permeability of soil-cement mixing piles under special coral reef geological conditions, taking a certain foundation pit water project of Hainan Island as the background, through the penetration tests on undisturbed soils and in-situ core tests, the impermeability variation laws of bentonite cement admixtures are obtained. The results show that:(1) the soil-cement mixing piles have good applicability in waterproofing engineering under coral reef geological conditions;(2) at the early stage, the influence of cement on soil-cement permeability is greater than that of bentonite, and at later stage due to the compact effect of bentonite, the influence of bentonite on soil-cement permeability is greater than that of the cement, and with the increasing quantity of bentonite, permeability coefficient of soil-cement decreases, and anti-permeability increases gradually. It has a certain referential meaning to waterproofing engineering under coral reef geological conditions.