陈文昭¹, 唐之博¹, 王东星², 刘夕奇²

（1. 南华大学土木工程学院, 湖南衡阳42100; 2. 武汉大学土木建筑工程学院, 湖北武汉430000）

引用格式：陈文昭, 唐之博, 王东星, 等. 海水侵蚀对水泥土强度的影响与数值模拟[J]. 中国粉体技术, 2023, 29(5): 112-124.

CHEN W Z, TANG Z B, WANG D X, et al. Effect of seawater erosion on the strength of cement soil and numerical simulation study[J]. China Powder Science and Technology, 2023, 29(5): 112-124.

DOI：10.13732/j.issn.1008-5548.2023.05.013

收稿日期：2022-11-25,修回日期：2023-07-19，在线出版时间：2023-08-28 12：03。

基金项目：中央高校科研项目,编号:2017-YB-022; 浙江省山体地质灾害重点实验室开放基金项目,编号:PCMGH-2021-03。

第一作者简介：陈文昭(1969—),男,副教授,博士,硕士生导师,研究方向为岩土工程稳定性、 深基坑与边坡支挡结构、 岩土工程多场耦合数值模拟、 尾矿坝安全评价等。E-mail: chengwz@usc.edu.cn。

通信作者简介：唐之博(1998—),男,硕士研究生,研究方向为地基处理。E-mail: 1845098682@qq.com。

摘要：为了研究滨海相淤泥土中侵蚀性离子对水泥土搅拌桩复合地基的强度与寿命的不利影响, 采用无侧限抗压强度试验、 扫描电子显微镜表征和数值模拟方法, 探讨侵蚀环境对水泥土工程力学性能的影响及海水侵蚀环境下多桩复合地基的工程性状。 结果表明: 含氯化钠水泥土的强度随氯化钠与土的质量比的增大先增大后减小, 含氯化镁水泥土的强度随氯化镁与土的质量比的增大而不断减小, 含硫酸镁水泥土的强度随硫酸镁与土的质量比的增加先增大后减小。 由数值模拟结果可见, 当盐与土的质量比为0.6 g/kg时, 水泥土搅拌桩单桩强度衰减约10%, 复合地基整体沉降最大值增加约20%。

关键词：水泥土; 海水侵蚀; 微观结构; 多桩复合地基; 数值模拟

Abstract：In order to investigate the adverse effects of erosive ions in coastal phase silt soil on the strength and life span of cement soil mixing pile composite foundation, unconfined compressive strength test, scanning electron microscope characterization and numerical simulation methods were used to explore the effects of erosive environments on the engineering mechanical properties of cemented soil and the engineering properties of multi-pile composite foundations under the seawater erosive environments. The results show that the strength of sodium chloride-containing hydraulic soil first increases and then decreases with the increase of the mass ratio of sodium chloride to soil, the strength of magnesium chloride-containing hydraulic soil decreases with the increase of the mass ratio of magnesium chloride to soil, and the strength of magnesium sulfate-containing hydraulic soil first increases and then decreases with the increase of the mass ratio of magnesium sulfate to soil. From the numerical simulation results, it can be seen that when the mass ratio of salt to soil is 0.6 g/kg, the strength of single pile of hydraulic soil mixing pile attenuates about 10%, and the overall settlement maximum of composite foundation increases about 20%.

Keywords：cemented soil; seawater erosion;microsized structure;multi-pile composite foundation;numerical simulation

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