寒区路基抗冻害阻水改良土设计试验研究  

Experimental Research on Design of Frost-resistant Water Blocking Modified Soil for Subgrade in Cold Regions

作　　者：胡峰 朱汉华 徐璟 黄冲 HU Feng;ZHU Hanhua;XU Jing;HUANG Chong(Zhejiang Institute of Communications Co.,Ltd.,Hangzhou 310012,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江数智交院科技股份有限公司,杭州310012 [2]浙江大学建筑工程学院,杭州310058

出　　处：《路基工程》2023年第3期6-12,共7页Subgrade Engineering

基　　金：第二次青藏高原综合科学考察研究(2019QZKK0904);国家自然科学基金面上项目(42277132);浙江省重点研发计划(2021C03159,2021KCKT2011)。

摘　　要：通过在两种黏性土中分别掺入不同配合比的阻水剂,制备成试样,进行吸水率、无侧限抗压强度测试和不同次数冻融循环条件后的力学试验。结果表明:在塑性指数大于15的黏性土中掺入15%的胶凝剂+配合比为1%~2%的阻水剂,改良土的吸水率是未加阻水剂的10%~20%。改良土试样的无侧限抗压强度随冻融循环次数的增加衰减较小,24次冻融循环后的无侧限抗压强度损失率在10%以内,而未改良土强度损失率高达50%以上。另外,含阻水剂的改良土试样受多次冻融循环后的质量变化率均小于5%。It was conducted by mixing different ratios of water-blocking agents into two types of clay soils to prepare specimens for water absorption,unconfined compressive strength test and undergoing mechanical test after different number of freeze-thaw cycles.The results show that the water absorption rate of the improved soil formed by mixing 15%of gelling agent+water blocking agent with the ratio of 1%-2%in the clay soil with plasticity index more than 15 was 10%-20%of that without water resist.The unconfined compressive strength of the modified soil specimens decreased less with the increase of freeze-thaw cycles,and the loss of unconfined compressive strength after 24 freeze-thaw cycles was within 10%,while the loss of strength of the unimproved soil was more than 50%.In addition,the mass change rate of the modified soil sample with water-barrier was less than 5%after undergoing several freeze-thaw cycles.

关 键 词：寒区路基 阻水改良土 抗冻性能 胶凝剂+阻水剂掺量 无侧限抗压强度 吸水率 质量损失率 

分 类 号：U419.92[交通运输工程—道路与铁道工程]