硫酸盐渍土盐胀的抑制措施  

Treatment for salt expansion of sulphate saline soil

作　　者：屈波[1] 顾强康[1] 李强[2] 连杰[1] 殷帛成[1] 

机构地区：[1]空军工程大学航空航天工程学院,陕西西安710038 [2]沈阳军区空军勘察设计院,辽宁沈阳110015

出　　处：《长安大学学报（自然科学版）》2013年第3期32-36,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：军队重大科研项目(BKJ11J)

摘　　要：为了降低硫酸盐渍土的盐胀性,分别采用氯化钠和氯化钙对硫酸盐渍土进行改良试验。配制硫酸钠含量为2%、4%、6%的土样,分别掺入一定量的氯化钠和氯化钙(使Cl-/SO42-为2、4、6、8),进行盐胀试验,并对试验结果进行了对比分析。通过分析相同氯化钠和氯化钙掺量对不同硫酸钠含量的盐胀率的影响,进一步验证了氯化钠和氯化钙对硫酸盐渍土盐胀性的作用机理。结果表明:氯离子对硫酸盐渍土的盐胀性有较好的抑制效果,并当Cl-/SO42-为4～6时,效果最为明显;当氯化钙掺量较低时,氯化钙对硫酸盐渍土的盐胀具有双重抑制效果,但当氯化钙掺量较高时,由于氯化钙和硫酸钙的吸水膨胀,抑制效果会有一定程度的减弱;该试验结果可为实际工程中硫酸盐渍土地基的处理提供一定的参考。In order to decrease the salt expansion of sulphate saline soil,NaCl and CaCl2 were used to treat the sulphate saline soil respectively.NaCl and CaCl2 were added in the soil samples with salt content of 2%,4% and 6% in the experiment.The amounts of NaCl and CaCl2 were based on the value of Cl-/SO42-which was at 2,4,6 and 8.The results were compared.Moreover,the function mechanism of NaCl and CaCl2 when they were used to treat the sulphate saline soil could be proved through analyzing the change of salt expansion of the sulphate saline soil when the salt content was different.The results show that Cl-has a good effect and the effect is especially good when Cl-/SO42-is between 4 and 6;CaCl2 has double action when the amount of which is low;however,when the amount of CaCl2 is high,it has some side effect which is caused by the expansion of CaCl2 and CaSO4.The results of the study can provide effective reference for the ground treatment of sulphate saline soil in the practical projects.3 tabs,4 figs,15 refs.

关 键 词：道路工程 硫酸盐渍土 氯化钠 氯化钙 盐胀处理 

分 类 号：U416.166[交通运输工程—道路与铁道工程]