硫酸盐对石灰土力学性质的影响  

EFFECT OF SULFATE ON THE MECHANICAL PROPERTIES OF LIME-STABILIZED SOIL

作　　者：赵阳[1] 徐永福 ZHAO Yang;XU Yongfu(Traffic Engi.Construction Bureau of Jiangsu Province,Nanjing 210006,China;School of Naval Architecture,Ocean and Civil Engi.,Shanghai Jiaotong Univ.,Shanghai 200240,China)

机构地区：[1]江苏省交通工程建设局,南京210006 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《低温建筑技术》2018年第6期18-22,共5页Low Temperature Architecture Technology

摘　　要：通过在石灰土中掺加硫酸盐,研究了硫酸盐对石灰土的劣化机理。研究表明:石膏与石灰的反应以及石膏消耗量在3d后基本完成。消耗6%的石灰需要大约4%的石膏。硫酸盐和石灰土反应产生钙矾石和硅灰石膏,导致石灰土体积膨胀,产生裂纹,强度降低。石灰土膨胀量与硫酸盐及石灰的含量均呈现近似线性关系。随时间增加,石灰土膨胀量增加。Na_2SO_4和Ca SO_4对石灰土的应力-应变关系曲线形状影响不大,但影响峰值强度。硫酸盐导致石灰土的粘聚力减小,对内摩擦角的影响很小。Based on the typical clayey soil of Yancheng highway,the effect of sulfate on the damage mechanism,swelling property and strength parameters of lime soil was studied.The results shows that the reaction of gypsum with lime and the consumption of gypsum are basically completed after 3 days.Consumption of 6%of lime requires about 4%of gypsum.Sulfate and lime soil react to produce ettringite and thaumasite,resulting in lime soil volume expansion,crack,and strength reduction.And the swelling capacity of lime soil shows an approximate linear relationship with sulfate and lime content.The swelling amount of lime soil increases over time.Na2SO4 and CaSO4 had little effect on the stressstrain curve of lime soil,but the peak strength was affected.The effect of sulfate on the internal friction angle is small.

关 键 词：硫酸盐 石灰土 损伤机理 膨胀性能 强度参数 

分 类 号：TU41[建筑科学—岩土工程]