电石渣稳定过湿黏土路基填料路用性能现场试验研究

发布时间：2018-01-25 02:26

本文关键词： 电石渣过湿黏土现场试验强度模量　出处：《东南大学学报(自然科学版)》2014年02期 　论文类型：期刊论文

【摘要】：通过对比电石渣和生石灰物理化学特征的异同,提出采用电石渣稳定过湿黏土作为路基填料.通过改良填料路用承载性能的现场试验,对比研究2种改良填料的土基CBR、回弹模量(Mr)、贯入阻力(Rs)和动力锥贯入指数(DCPI)等力学指标在养护龄期内的变化规律.试验结果表明:电石渣相对生石灰比表面积大、细粒含量高,在相同掺量和养护条件下更利于填料中改良反应的进行,可以更有效地改善过湿黏土填料的路用力学性能;电石渣改良填料的DCPI与其CBR和Mr的相关性更高;同时,电石渣较石灰具有明显的成本优势,并具有施工不扬尘、CO2排放少等社会环境效益.电石渣稳定过湿黏土路基填料具有良好的工程应用前景.
[Abstract]:By comparing the physical and chemical characteristics of calcium carbide slag and quicklime, it is put forward that calcium carbide slag stabilized overwet clay is used as subgrade filler, and the field test of improving road bearing capacity of calcium carbide slag is put forward. The soil CBRs of two kinds of improved fillers are studied comparatively. The variation of mechanical indexes such as penetration resistance (Rs) and dynamic cone penetration index (DCPI) during curing age. The experimental results show that the specific surface area of calcium carbide slag is relatively large and the content of fine particles is high. Under the same dosage and curing conditions, it is more favorable to improve the reaction in fillers, and the road mechanical properties of overwetted clay fillers can be improved more effectively. The correlation between DCPI and CBR and Mr of calcium carbide slag modified filler is higher. At the same time, calcium carbide slag has obvious cost advantage over lime, and has social and environmental benefits such as less CO _ 2 emission from construction, etc. Calcium carbide slag has a good prospect of engineering application in stabilizing overwet clay subgrade filler.
【作者单位】：东南大学岩土工程研究所;江苏鸿基科技有限公司;
【基金】：国家自然科学基金资助项目(51278100) 江苏省自然科学基金资助项目(BK2012022) 江苏省交通科技资助项目(08Y30)
【分类号】：U416.1;U414
【正文快照】： 江苏常州某绕城高速公路地处长江三角洲地带,周边缺乏优质路基填料.为避免外地调运推高建设成本,同时节约本地耕地资源,拟选用京杭大运河开挖土作为路基填料.这种土在长三角和太湖冲积平原地带大量分布,其天然含水率(多不低于30%)虽未达到液限,但大大高于最优含水率(一般在14%

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