水泥加固高岭土的静动力特性初探  

Preliminary Study on the Static and Dynamic Characteristics of Cement-treated Kaolin Clay

作　　者：张磊 彭乾卓 石浚 陈成 ZHANG Lei;PENG Qian-zhuo;SHI Jun;CHEN Cheng(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《武汉理工大学学报》2023年第4期104-111,共8页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(52178353).

摘　　要：采用马来西亚高岭土为试验材料,水泥作为固结剂对高岭土进行加固处理,利用GDS三轴仪对试样进行常规三轴试验和动三轴试验,基于试验数据开展了多元回归分析,获得了水泥加固高岭土试样的动剪切模量与阻尼比的半经验预测公式,可为快速评估水泥土的动力特性提供一定的参考。结果表明,常规三轴试验中,随着养护时间的增长和水泥掺量的增加,试样的强度与剪切模量均逐渐增大;动三轴试验中,随着荷载循环次数的增加,试样的动剪切模量和阻尼比均呈衰减趋势,且该衰减效应主要发生在前5个荷载循环周期内;随着水泥掺量或养护时间的增加,试样的动剪切模量呈现出明显的增长趋势,而试样的阻尼比随水泥掺量的增加而逐步减小,养护时间的增长对阻尼比的减弱效应较为微弱。Malaysian kaolin clay was adopted as test material and cement was used as reinforcement material.The specimens were tested following both conventional and cyclic triaxial testing procedures using GDS triaxial apparatus.Two semi-empirical prediction formulae of dynamic shear modulus and damping ratio for cement-treated kaolin clay were obtained by multi-variate regression analysis on the basis of test data,which could provide a useful reference for evaluating the dynamic characteristics of cement-treated clays.The results show that,the strength and shear modulus of specimen are found to increase with both the curing time and cement ratio from conventional triaxial tests.In dynamic triaxial tests,with the increasing loading cycle,both the dynamic shear modulus and damping ratio appear to decrease,especially within the first 5loading cycles.The dynamic shear modulus of the specimen tend to increase gradually with both the increasing cement ratio and curing time.The damping ratio of the specimen has a gradual reduction trend with the increasing cement ratio,and is much less dependent on the curing time.

关 键 词：水泥加固高岭土 动三轴试验 动剪切模量 阻尼比 回归分析 

分 类 号：TU447[建筑科学—岩土工程]