吹填泥浆固化土蠕变及长期强度特性研究  

Research on creep and long-term strength characteristics of solidified dredger mud

作　　者：杨爱武 杨少坤 梁超[3] 封安坤 YANG Aiwu;YANG Shaokun;LIANG Chao;FENG Ankun(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,Tianjin Chengjian University,Tianjin 300384,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China;Xi′an Architectural Design and Research Institute Co.Ltd,Xi′an 710054,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]天津城建大学天津市软土特性与工程环境重点实验室,天津300384 [3]天津大学建筑工程学院,天津300350 [4]西安市建筑设计研究院有限公司,陕西西安710054

出　　处：《自然灾害学报》2020年第3期28-35,共8页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51978440);天津市科技计划项目(19JCZDJC39700,2016CJ01)。

摘　　要：利用GU型号粉末固化剂对天津临港工业区的吹填泥浆进行固化,对固化后的吹填泥浆固化土进行不同围压下的蠕变试验。结果表明,泥浆固化土蠕变历时曲线整体态势与一般结构性软土相似,但又有明显特征,其瞬时变形较大,衰减过程很短;蠕变等时曲线均存在明显拐点,拐点前后曲线刚度发生变化,表明固化土具有较强结构性且此点对应的应力为结构屈服应力。此外,t=0h的等时曲线离散性较强,其他时间点曲线具有明显一致性,表现出固化土结构性材料的特点。基于蠕变等时曲线,结合应力-应变的双曲线关系,引入时间参量t,建立了能够反映泥浆固化土蠕变特征的预测公式。同时,利用蠕变等时曲线,构建了泥浆固化土长期强度预测关系式,并求得固化土长期抗剪强度指标值。GU powder curing agent is used to solidify the dredger mud taken from the Lingang industrial zone in Tianjin,and then the creep deformation experiments of the solidified soil are carried out under different confining pressures.The results showed that the overall situation of the isochronous curves of mud solidified soil are similar to the classic soft soil,but also has its obvious characteristics of large instantaneous deformation and short attenuation process.The isochronous curve of creep has obvious inflection point and its stiffness changes obviously after the point,which indicates that the solidified soil has strong structure and the stress corresponding to this point is structural yield stress.In addition,the isochronous curve of t=0h is more discrete,which the curves of other time points are obviously consistent,showing the characteristics of solidified soil structural materials.Based on the isochronous curve of creep,a prediction formula which can reflect the creep characteristics of mud solidified soil is established by taking the parameter t of time into the hyperbolic relationship between stress and strain.Meanwhile,by using the isochronous curve of creep,the prediction formula of long-term strength of mud solidified soil is constructed,and the index value of long-term shear strength of solidified soil is obtained.

关 键 词：吹填泥浆 固化土 蠕变 历时曲线 等时曲线 长期强度 

分 类 号：TU411[建筑科学—岩土工程] X9[建筑科学—土工工程]