Abstract
Modern coastal cities continue to expand to the sea, but the marine silt foundation has high water content and poor bearing capacity. Therefore, it is necessary to find economical and rapid ways to reduce the water content of the silt and improve the bearing capacity of the silt foundation. The steel slag is considered to be incorporated into silt to effectively reduce the moisture content of soil and improve the bearing capacity of the foundation due to its hard texture and strong water absorption capacity. In this paper, the shear strength characteristics of marine silt modified by steel slag were studied using an automatic triaxial instrument, as well as the relationship between steel slag incorporation and modified silt density. Experimental results showed that the incorporation of steel slag can effectively improve the shear strength of the silt. Besides, the influences of water content, steel slag incorporation, and confining pressure on the stress-strain curve characteristics and failure deviatoric stress of modified silt were also analyzed. The addition of steel slag increases the failure deviatoric stress of the silt. However, the increase of water content will weaken the effect of steel slag incorporation. The shear strength index of improved silt with different steel slag incorporation was compared with that of traditional soil, verifying the feasibility of its application in engineering construction.
Highlights
Guan et al [1] reported that marine silt is a kind of structural soft soil which mainly composed of very fine clay jelly and was accompanied by microorganisms and organics, deposited in still water or slow flowing water environment
E failure deviatoric stress of the samples increased with the increase of steel slag incorporation showing that the antideformation and failure ability of silt with different water content will be improved with the addition of steel slag incorporation. e failure deviatoric stress values of silt with 70% and 90% water content with different steel slag incorporation conditions were similar under the same confining pressure. e results show that the silt with 70% and 90% moisture content has similar antideformation and failure ability under the same steel slag incorporation
When the water content rose from 50% to 70%, the decrease was most obvious. e relationship curve between failure deviatoric stress and water content of improved silt is basically same under different confining pressures, which indicates the reliability of this law
Summary
Guan et al [1] reported that marine silt is a kind of structural soft soil which mainly composed of very fine clay jelly and was accompanied by microorganisms and organics, deposited in still water or slow flowing water environment. In the preparation process of steel slag silt, it was found that when the steel slag incorporation ratio αs was less than 30, the sample with high moisture content improved silt in the soft plastic state. To study the strength characteristics of silt solidified soil with different water content, the triaxial sample preparation was carried out on the silt with higher water content. E shear strength characteristics of three groups of silt under different moisture content, steel slag incorporation, and confining pressure were measured in the test totally.
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