水泥含量对全风化花岗岩加固土本构模型参数的影响  

Influence of cement content on constitutive model parameters of reinforced completely decomposed granite soil

作　　者：马得山 张东 唐瑞 刘飞 焦经之 刘少文 苏栋[4] MA Deshan;ZHANG Dong;TANG Rui;LIU Fei;JIAO Jingzhi;LIU Shaowen;SU Dong(China Construction Third Engineering Bureau First Construction Engineering Co.Ltd.,Shenzhen 518049,Guangdong Province,P.R.China;China Construction Third Engineering Bureau(Shenzhen)Co.Ltd.,Shenzhen 518049,Guangdong Province,P.R.China;Shenzhen Nanshan Talent Housing Co.Ltd.,Shenzhen 518063,Guangdong Province,P.R.China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,Guangdong Province,P.R.China)

机构地区：[1]中建三局第一建设工程有限责任公司,广东深圳518049 [2]中建三局集团(深圳)有限公司,广东深圳518049 [3]深圳市南山人才安居有限公司,广东深圳518063 [4]深圳大学土木与交通工程学院,广东深圳518060

出　　处：《深圳大学学报（理工版）》2024年第5期612-618,共7页Journal of Shenzhen University(Science and Engineering)

基　　金：深圳市高等院校稳定支持计划资助项目(20220808143139001);国家自然科学基金资助项目(52090081)。

摘　　要：全风化花岗岩广泛分布于中国华南地区,由于遇水易软化崩解,部分工程采取后注浆的方式对全风化花岗岩地层中桩基周围的土体进行加固.为研究水泥含量对全风化花岗岩加固土力学性质的影响,对水泥质量分数为2%~16%的全风化花岗岩重塑加固土进行剪切试验,结合数值模拟,标定不同水泥质量分数加固土的本构模型参数,得到了水泥质量分数对全风化花岗岩加固土的临界状态参数、弹性参数和塑性参数等的影响规律.研究发现,22个本构参数中随水泥质量分数变化而变化和不随水泥质量分数变化而变化的参数各为11个,随水泥质量分数变化的参数数值与水泥质量分数成线性关系或二次函数关系.研究成果为全风化花岗岩加固土本构模型参数的确定提供了新途径,可为全风化花岗岩非均匀后注浆对桩基承载特性的影响研究提供重要参考.Completely decomposed granite(CDG)is widely distributed throughout the South China.Due to its tendency to soften and disintegrate upon contact with water,the post-grouting method is employed in some engineering projects to reinforce the soil around pile foundations in CDG strata.The amount of cement used in the grouting significantly affects the bearing capacity of these foundations.To investigate the impact of varying cement content in grouting on the mechanical properties of reinforced CDG,a series of shear tests were conducted on remolded CDG soil treated with cement contents of 2%~16%.By incorporating numerical simulation,this study calibrated the parameters of the constitutive model for the reinforced CDG under varying cement contents.Through this approach,the relationship among cement content and the parameters of critical state,elasticity,and plasticity of the CDG was identified.It was disclosed that,among the 22 parameters in total,11 parameters vary with the cement content,while the other 11 parameters remain constant.The variable parameters exhibit either linear or quadratic relationships with the cement content.This study proposes a novel approach to determine the parameters of the constitutive model for the reinforced CDG and provides essential insights into the impact of uneven grouting on the bearing capacity of pile foundations in CDG strata.

关 键 词：岩土工程 全风化花岗岩 加固土 水泥 剪胀性 本构模型参数 

分 类 号：TU411[建筑科学—岩土工程]