大型基础下基底层状土的变形性状分析  

Investigation on the Deformation Behavior of Multi-layered Soils Under a Large Foundation

作　　者：修占国 李纯[1] 王斐笠 齐佳 XIU Zhan-guo;LI Chun;WANG Fei-li;QI Jia(School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院

出　　处：《东北大学学报（自然科学版）》2019年第12期1779-1783,共5页Journal of Northeastern University(Natural Science)

基　　金：辽宁省自然科学基金资助项目(2013010311-401)

摘　　要：基于土体变形理论,建立了大型基础下层状土的变形计算模型,运用自编程序SSBS(Simulating Subsidence of Building Subsoil)对工程算例进行了计算分析,并结合该算例的实测数据对计算结果进行了对比校验.研究结果表明:基坑降水使得基底上覆土层产生有效应力增量,且有效应力增量对基底变形的贡献不可忽略;同时,由于大型基础下基底附加应力的非均匀分布,导致最大荷载与最大变形点不一致,基础中心点非最大变形点;应用层状地基变形计算方法得到的变形计算结果更接近工程实际.研究结论可为大型基础下层状地基变形控制提供参考依据.The deformation calculation model called SSBS(simulating subsidence of building subsoil)for multi-layered soils under a large foundation was established based on the soil deformation theory.The deformation of the multi-layered soils of a real project was calculated and compared with the monitored values.It is found that the effective stress increment can be formed in soils above the foundation base due to dewatering,which cannot be neglected.Because of the non-uniform distribution of the subsidiary stress in subsoil under large foundation,the locations of the maximum loading point and the maximum deformation point are not coincident,which means that the maximum deformation does not occur at the center of the foundation.The results show that the deformation calculated by the established model is closer to the field minoring results,thus can be a reference for the deformation analysis for multi-layered subsoil under large foundation.

关 键 词：非饱和土 层状土 变形 有效应力增量 有效附加应力 

分 类 号：TU740[建筑科学—建筑技术科学]