某工程地基岩体流变特性现场试验研究  

Field test study on rheological properties of foundation rock mass

作　　者：白高峰 赵丰博 霍雨佳 姜浩 BAI Gao-feng;ZHAO Feng-bo;HUO Yu-jia;JIANG Hao(Hebei Jianyan Architectural Design Co.,Ltd.,Shijiazhuang 050022,Hebei,China;China Nuclear Power Design Co.,Ltd.,(Shenzhen),Shenzhen 518172,Guangdong,China)

机构地区：[1]河北建研建筑设计有限公司,河北石家庄050022 [2]深圳中广核工程设计有限公司,广东深圳518172

出　　处：《地基处理》2021年第5期388-396,共9页Journal of Ground Improvement

摘　　要：岩体流变是岩体的一种重要工程特性,对于分析大荷载、长期工程的受力变形和稳定尤为重要。为了预测某重要工程的地基沉降,针对该工程地基岩体中的3种不同岩性:砂岩、泥质粉砂岩和泥页岩分别进行了现场流变试验。对不同岩性的流变特性做出分析,结果表明地基岩体具有明显的流变特性,不同岩性的蠕变过程、弹性后效和黏性流动等又存在差异。另外还分析了岩体含水状态对流变试验的影响,表明含水率变化对软岩泥页岩变形影响明显,对泥质粉砂岩和砂岩影响很小。采用广义Kelvin三参量模型对试验进行辨识,根据模型对试验数据进行参数反演,最后得出了地基岩体的流变参数,为地基岩体变形预测提供了科学依据。Rock mass rheology is an important engineering characteristic of rock mass,which is particularly important for analyzing the deformation and stability of large load and long-term engineering.In order to predict the foundation settlement of an important project,field rheological tests were carried out for three different lithologies of foundation rock:sandstone,argillaceous siltstone and mud shale.Through the analysis of rheological properties of different lithologies,the results show that the foundation rock mass has obvious rheological properties,and there are differences in creep process,elastic aftereffect and viscous flow of different lithologies.In addition,the influence of water content of rock mass on the rheological test is also analyzed.The results show that the change of water content has obvious influence on the deformation of soft shale,but has little influence on argillaceous siltstone and sandstone.The generalized Kelvin three parameters model is used to identify the tests,and the parameter inversion of the test data is carried out according to the model.Finally,the rheological parameters of the foundation rock mass are obtained,which provide a scientific basis for the prediction of the foundation rock mass deformation.

关 键 词：基岩地基 沉积岩 流变 KELVIN模型 

分 类 号：TU45[建筑科学—岩土工程]