南疆铁路路基填料改良盐渍土的盐胀冻胀试验研究  

Experimental Research on Frost Heave and Salt Expansion of the Improved Saline Soil of Railway Roadbed Filling at South of Xinjiang

作　　者：余云燕[1] 赵德安[1] 彭典华[1] 马惠民 金培杰 侯殿英 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中铁西北科学研究院,甘肃兰州730000

出　　处：《兰州交通大学学报》2009年第1期1-5,共5页Journal of Lanzhou Jiaotong University

基　　金：铁道部科技发展计划重点课题(2004G034)

摘　　要：结合南疆铁路路基病害整治工程,从就地取材、经济可行的原则出发,利用氯化钙、消石灰、水泥和粉煤灰等掺合料,确定6种改良方案,进行改良盐渍土的盐胀冻胀室内试验研究,并与重塑土作比较,为最优改良方案的确定提供依据.试验结果表明:盐渍土中掺入氯化钙或氯化钙和石灰能有效缓解盐胀冻胀的发生,掺入水泥、粉煤灰和石灰没有盐胀冻胀现象.该结论与现场试验段相一致.Saline soil was improved by calcium chloride, cement, hydrated lime and fly ash, and six schemes of improved saline soil were determined, according to the project of railway roadbed disease managing at south of Xinjiang. Laboratory testing of frost heave and salt expansion of each improved saline soil were studied, and experimental results compared with that of remolded soil. The results shows that the improved saline soil mixed with calcium chloride or calcium chloride and hydrated lime can efficiently decrease swell increment of frost heave and salt expansion, while it mixed with cement, hydrated lime and fly ash can completely restrain frost heave and salt expansion, which is verified in site working.

关 键 词：盐渍土 路基填料 改良盐渍土 冻融循环 盐胀冻胀 

分 类 号：TU411.7[建筑科学—岩土工程]