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为了分析硫酸盐渍土在定量增湿条件下的盐胀特性,设计制作了定量增湿盐胀试验装置,通过室内试验得到不同含盐量、不同干密度和不同上覆荷载条件下重塑硫酸盐渍土的定量增湿盐胀曲线。研究结果表明:含盐量越高增湿盐胀变形越大,盐渍土的剧烈盐胀含水量上限在11%~16%之间;干密度越大增湿盐胀越大,干密度每增加0.1g/cm3,总盐胀率增加1.1%~2.9%;上覆荷载越大盐胀越小,在0~25kPa范围内,上覆荷载每增加10kPa,土样盐胀率减小约3.6%,25~50kPa的上覆荷载将盐胀率抑制在2.1%左右。试验结果的综合分析表明:机场换填宜用细颗粒非盐渍土,慎用细颗粒弱盐渍土,建议换填深度取0.75~2m;依据土基工作含水量与剧烈盐胀含水量上限的对比,建议将盐渍土土基处理分成2类。
In order to analyze the salt expansion characteristics of sulphate soils under the conditions of quantitative humidification, a quantitative humidification salt expansion test device was designed and manufactured. The indoor experiments were conducted to obtain the salt content, the dry density, Quantitative and humidification salty salt expansion curve of saline soil. The results show that the higher the salt content is, the larger the salt water swell deformation is. The upper limit of severe salt water content in saline soil is between 11% and 16% Increasing 0.1g / cm3, the total salt expansion rate increased by 1.1% -2.9%; the larger the overlying load was, the smaller the saltiness was. In the range of 0 ~ 25kPa, the soil salt expansion rate decreased by about 3.6 %, 25 ~ 50kPa overburden will be suppressed at 2.1% salt expansion rate. The comprehensive analysis of the test results shows that it is appropriate to use fine granular non-saline soil for airport replacement, caution should be used for fine-grained weak saline soil, and the recommended replacement depth should be 0.75-2m. Based on the working water content of soil foundation and the upper limit of water content of severe salt expansion , It is suggested that the treatment of saline soil soils should be divided into two categories.