CHEN Wenzhao¹, TANG Zhibo¹, WANG Dongxing², LIU Xiqi²

(1. School of Civil Engineering, University of South China, Hengyang 421001, China;2. School of Civil Engineering, Wuhan University, Wuhan, 430000, China)

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

Get Citation：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

Received：2022-11-25,Revised：2023-07-19,Online：2023-08-28 12：03。

Funding Project：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。

First Author：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。

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