不同钙源EICP溶液改良路基黄土动力特性研究  

Study on Dynamic Characteristics of Subgrade Loess Improved by EICP Solution with Different Calcium Sources

作　　者：田威[1] 云伟 党可欣 李腾 TIAN Wei;YUN Wei;DANG Kexin;LI Teng(School of Civil Engineering,Chang'an University,Xi'an 710061,China)

机构地区：[1]长安大学建筑工程学院,西安710061

出　　处：《材料导报》2024年第9期53-61,共9页Materials Reports

基　　金：陕西高校青年创新团队。

摘　　要：由于黄土地区路基基床强度低,在长期动态压力下黄土会发生不均匀沉降、滑坡或坍塌等工程问题。为了使动荷载作用下的黄土强度更符合实际工程需要,有必要进一步研究不同钙源EICP溶液对黄土动强度的改良效果。本工作以陕西某基坑黄土为研究对象,在胶凝液中引入环保型木钙代替传统钙源进行技术改进,结合室内动三轴试验在不同围压下比较三种钙源EICP溶液对黄土的固化效果。结果表明:EICP溶液能显著提高黄土的动强度;同一围压下,黄土试样动应力和阻尼比随应变的增大逐渐升高,而动剪切模量随应变的增大逐渐降低;围压较小时,乙酸钙源EICP溶液对黄土动强度的改良效果较好,而当围压较大时,木钙源EICP溶液对黄土动强度的改良效果较好;同一试样所受围压越大,动强度和动剪切模量越大,阻尼比越小。The strength of subgrade bed in loess area is small,and engineering problems such as uneven settlement,landslide or collapse usually occur under long-term dynamic pressure.In order to make the strength of loess under dynamic load more suitable for practical engineering,it is necessary to further study the improvement effect of different calcium source EICP solution on the dynamic strength of loess.Loess from a foundation pit in Shaanxi province was taken as the research object,environmental friendly calcium lignosulfonate was introduced into the cementing fluid to replace the traditional calcium source for technical improvement,combined with indoor dynamic triaxial test,the curing effect of EICP solution of three calcium sources on loess was compared under different confining pressures.The results show that:EICP solution can effectively improve the dynamic strength of loess.Under the same confining pressure,the dynamic stress and damping ratio of loess samples gradually increase with the increase of strain,while the dynamic shear modulus gradually decreases with the increase of strain.When the confining pressure is small,the calcium acetate source EICP solution has better effect on improving the dynamic strength of loess,and when the confining pressure is large,the wood calcium source EICP solution has better effect on improving the dynamic strength of loess.The larger the confining pressure of the same sample,the larger the dynamic strength and dynamic shear modulus,and the smaller the damping ratio.

关 键 词：道路工程 黄土 脲酶诱导碳酸钙沉积(EICP) 木钙 动强度 

分 类 号：TU458[建筑科学—岩土工程]