MgO改性淤泥固化土压缩特性试验

发布时间：2018-02-05 18:57

本文关键词： 活性MgO 固化淤泥压缩特性压缩模量屈服应力　出处：《中南大学学报(自然科学版)》2017年08期 　论文类型：期刊论文

【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。
[Abstract]:Low carbon, environmental protection activity of MgO into the sludge solidification processing, through one-dimensional consolidation test to carry out a series of exploratory research. The solidified silt of different MgO content and different curing period were analyzed. The results show that: it has obvious improvement in compression properties of doped MgO on the activity of solidified silt with MgO doped. The amount and curing time increased, the solidified silt compressibility decreases, while the consolidation yield stress increases; for the silt, when the dosage of MgO is 6%, the silt compressibility mutated by high compressibility soil into low compressibility soil. From the angle of compression modulus of solidified silt compression were found to affect compression modulus with stress evolution by factors such as the dosage of MgO; when MgO content reached around 6% when the modulus of stress relationship curve of apparent peak phenomenon; this phenomenon and the formation of soil structure It is closely related, and the discovery is consistent with the results of silt compression analysis, and the trend of peak modulus and compression index change roughly obeys the power function model.

【作者单位】：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;中国矿业大学深部岩土力学与地下工程国家重点实验室;
【基金】：国家自然科学基金资助项目(51609180) 湖北省自然科学基金资助项目(2016CFB115) 深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1506) 中央高校基本科研业务费专项资金资助项目(2042016kf0048)~~
【分类号】：TU447

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