固化滨海盐渍土力学及溶陷特性研究

Study on Mechanics and Settlement Characteristics of Solidified Coastal Saline Soil

滨海盐渍土作为一种特殊土,具有溶陷、盐胀、腐蚀等不良的工程特性,为研究石灰+粉煤灰+水泥固化盐渍土改良材料土作为路基土的适用性,开展了液塑限、击实、无侧限抗压强度、三轴压缩、溶陷性试验,分析不同条件对改良盐渍土物理性指标、力学性能、溶陷特性的影响。结果表明:液塑限随固化剂掺入量的增加基本呈线性增加趋势,塑性指数减小;固化剂的加入使盐渍土最大干密度减小,最优含水率变化不明显;固化剂掺量和养护期龄对滨海盐渍土的力学性能影响显著;固化剂掺量小于14%时溶陷沉降量随固化剂掺量的增加呈减小趋势,提高含水率、压实度可以有效地降低固化盐渍土的溶陷沉降量。

The coastal saline soil,being a unique type of soil,exhibits unfavorable engineering characteristics such as solution subsidence,salt swelling,and corrosion.In order to investigate the suitability of lime,fly ash and cement solidified material for improving subgrade soil composed of saline soil,tests were conducted on liquid plastic limit,compaction,unconfined compressive strength,triaxial compression,and solution subsidence.The impact of different conditions on physical indices,mechanical properties,and settlement characteristics of the improved saline soil was analyzed.The results indicate that an increase in the content of curing agent leads to a linear rise in both liquid and plastic limits while reducing the plasticity index.Additionally,incorporating the curing agent decreases the maximum dry density of saline soil without significantly altering its optimum moisture content.Both curing agent content and age exert significant influences on the mechanical properties of coastal saline soil.When the curing agent content is below 14%,an increase in its concentration results in reduced settlement amount.Furthermore,increasing water content and compaction level effectively mitigate settlement in cured saline soils.