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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第8期    总第276期    2017年8月

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文章编号:1672-7207(2017)08-2133-09
MgO改性淤泥固化土压缩特性试验
王宏伟1,王东星1, 2,贺扬1

(1. 武汉大学 土木建筑工程学院,岩土与结构工程安全湖北省重点实验室,湖北 武汉,430072; 2. 中国矿业大学 深部岩土力学与地下工程国家重点实验室,江苏 徐州,221008)

摘 要: 将低碳、环保的活性MgO引入淤泥固化处理,通过一维压缩固结试验开展系列探索性研究。对不同MgO掺量和不同养护龄期的淤泥固化土进行分析。研究结果表明:入掺活性MgO对淤泥固化土的压缩特性具有明显改良作用。随着MgO掺量和养护龄期增加,淤泥固化土压缩性呈逐渐减小趋势,而固结屈服应力逐渐增大;对于所研究淤泥,当MgO掺量为6%时,淤泥压缩性发生突变,由高压缩性土体演变为低压缩性土体。从压缩模量角度研究固化淤泥压缩性状,发现压缩模量随应力演化过程受MgO掺量等因素影响;当MgO掺量达到6%左右时,模量-应力关系曲线出现明显峰值现象;这种现象与土体结构性的形成密切相关,且该发现与淤泥压缩性分析结果相吻合;峰值模量与压缩指数变化趋势大致服从幂函数关系模型。

 

关键字: 活性MgO;固化淤泥;压缩特性;压缩模量;屈服应力

Experimental study on compressibility behavior of solidified dredged sludge with reactive MgO
WANG Hongwei1, WANG Dongxing1, 2, HE Yang1

1. Hubei Key Laboratory of Safety for Geotechnical and Structural Engineering, School of Civil Engineering, Wuhan University, Wuhan 430072, China; 2. State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221008, China

Abstract:The experimental study was performed by using 1-D consolidation test on the dredged materials solidified with reactive MgO, an environmental-friendly and low carbon binder. MgO-solidified sludges with different MgO contents and curing times were analysied. The results show that the addition of MgO has an important influence on the compressibility behavior of solidified sludge. The compressibility of MgO-solidified sludge tends to decrease with curing time and MgO content, while the yielding stress increases gradually. When MgO amount increases to 6% of dry soil mass, the compressibility of solidified sludge changes significantly, from high compressible soil to low compressible soil. Based on the concept of compression modulus, it can be found that the compression modulus against consolidation stress curves are significantly affected by MgO content, and the peak modulus appears once the MgO content reaches around 6%. Whether the phenomenon of peak modulus occurs is closely related with the formation of soil structure owing to the chemical bonding, and this finding agrees well with the variation of compressibility with MgO content. Finally, the result suggests that the peak modulus tends to change with compression index with a power function model.

 

Key words: reactive magnesia; solidified sludge; compressibility; compression modulus; yielding stress

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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