针对膨胀土水泥改性处理施工技术中出现的问题,在总结相关文献及参考石灰改性膨胀土工法的基础上,通过膨胀土水泥改性施工工艺现场试验,对施工中3个关键技术(开挖料高含水率速降、开挖料超径土团破碎、改性土填筑施工时效性)进行了系统研究。对于现场施工中采用的破碎机、旋耕机、条筛、机械组合等碎土施工工法,分析比较了土团破碎效果、工程适用性以及水泥掺拌均匀程度;总结得出了膨胀土含水率速降施工方法、土团破碎施工方法以及水泥改性土填筑施工要求。研究成果可为改性膨胀土工程施工工艺提供借鉴。
Abstract
In order to solve problems in the cement-improved treatment for expansive soil, we conducted a field test of the construction techniques according to summary of relevant literatures and construction method of expansive soil improved by lime. Furthermore, three key methods in construction were studied, including reduction of high water content in the excavated soil, breakage of oversize soil aggregate, and time effect of filling construction of cement-improved expansive soil. Then, uniformity of blending cement and the applicability and feasibility of construction process using crusher, rotavator, strip sieve, machine combination ,etc were systematically analyzed.Finally, a construction method for improving expansive soil by cement was put forward. The results can provide references for the construction techniques of improving expansive soil.
关键词
水泥改性膨胀土 /
施工工艺 /
含水率速降 /
土团破碎 /
EDTA滴定
Key words
cement-improved expansive soil /
construction technology /
reduction rate of moisture content /
breakage of soil aggregate /
EDTA titration
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参考文献
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基金
国家“十二五”科技支撑计划项目(2011BAB10B05)
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