基于随机场理论的纯黏土地基极限承载力分析  

Analysis of ultimate bearing capacity of purely clay foundation based on random field theory

作　　者：赵少飞 胡欣宇 邢明源 鲍俊文 ZHAO Shaofei;HU Xinyu;XING Mingyuan;BAO Junwen(School of Civil Engineering,North China Institute of Science and Technology,Yanjiao,065201,China)

机构地区：[1]华北科技学院建筑工程学院,北京东燕郊065201

出　　处：《华北科技学院学报》2021年第1期48-52,共5页Journal of North China Institute of Science and Technology

摘　　要：土的物理和力学特性往往随空间位置而变化,因此在研究自相关距离对条形地基极限承载力的影响时,需要引入随机场理论。本文基于随机场理论,利用数值分析软件FLAC2D建立纯黏土地基模型,计算出不同黏聚力的自相关距离所对应的地基极限承载力,分析黏聚力空间变异性对地基极限承载力影响规律,进而探讨自相关距离所对应最不利工况。结果表明,条形地基极限承载力系数随自相关距离的增加呈非线性波动,当自相关距离与基础宽度比值为0.33时承载力系数均值最小,此时为最不利工况。The physical and mechanical properties of soil often vary with the spatial position.Therefore,random field theory needs to be introduced when studying the influence of autocorrelation distance on the ultimate bearing capacity of strip foundations.Based on the random field theory,this paper used the numerical analysis software FLAC2D to establish a purely clay foundation model.The ultimate bearing capacity of the foundation corresponding to the autocorrelation distance of different cohesion forces was calculated,the influence of the spatial variability of the cohesion on the ultimate bearing capacity of the foundation was analyzed,and then the most unfavorable conditions corresponding to the autocorrelation distance was discussed.The results show that the ultimate bearing capacity coefficient of the strip foundation fluctuates nonlinearly with the increase of the autocorrelation distance.When the ratio of the autocorrelation distance to the foundation width is 0.33,the average value of the bearing capacity coefficient is the smallest,which is the most unfavorable condition at this time.

关 键 词：随机场 自相关距离 数值模拟 承载力系数 

分 类 号：TU311.2[建筑科学—结构工程]