地基附加应力改进计算方法及其规律分析  

An Improved Calculation Approach of Subgrade Additional Stress with Its Law Analysis

作　　者：贺敏 仰宗宝 徐卓君 曹文贵[2] 张超 徐赞[4] HE Min;YANG Zongbao;XU Zhuojun;CAO Wengui;ZHANG Chao;XU Zan(College of Civil Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China;Institute of Geotechnical Engineering,Hunan University,Changsha 410082,China;Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan Hunan 411201,China;School of Civil Enginnering,Hunan City University,Yiyang Hunan 413000,China)

机构地区：[1]湖南工业大学土木工程学院,湖南株洲412007 [2]湖南大学岩土工程研究所,湖南长沙410082 [3]湖南科技大学岩土工程稳定控制与健康监测湖南省重点实验室,湖南湘潭411201 [4]湖南城市学院土木工程学院,湖南益阳413000

出　　处：《湖南工业大学学报》2022年第5期20-28,共9页Journal of Hunan University of Technology

基　　金：国家自然科学基金资助项目(51909086);湖南省自然科学基金资助项目(2020JJ5131);湖南省教育厅科研基金资助项目(18C0505,19C0570,20C0371);国家级大学生创新创业训练计划基金资助项目(202111527033)。

摘　　要：地基附加应力解析方法是地基稳定性分析的关键,目前工程中普遍采用基于半无限连续线弹性体理论力学分析地基附加应力,然而地基土体并非连续线弹性体,而是由大量大小相差悬殊的颗粒无序堆积而成的散粒体。因此,首先考虑地基土散体介质特征,建立了基于竖向矩形均布荷载作用下的地基附加应力改进计算方法,并验证了其合理性;在此基础上,基于正交试验设计方法分析了竖向均布荷载大小、内摩擦角、颗粒不均匀系数等参数对地基附加应力的影响规律。结果表明,影响附加应力的因素按其影响程度由大至小依次为荷载大小、颗粒不均匀系数、内摩擦角,且附加应力随颗粒不均匀系数和内摩擦角的增加而减小,随外加荷载的增大而增大,而其增量随荷载增大而逐渐减小。Due to the fact that the analytical method of foundation additional stress is the key of foundation stability analysis,the mechanical analysis of foundation additional stress based on semi-infinite continuous linear elastomer theory is widely used in engineering currently.However,the soil is not continuous line-elastic materials,but granular materials with particles of different sizes and disorderly arrangement.Therefore,with the characteristics of foundation soil bulk medium taken into consideration,an improved calculation method of foundation additional stress under vertical rectangular uniformly distributed load has thus been established,with its rationality to be verified.On this basis,by adopting the orthogonal experimental design method,an analysis has been made of the effects of vertical uniformly distributed load,internal friction angle and particle non-uniformity coefficient on the additional stress of foundation.The results show that the factors affecting the additional stress include the load size,particle non-uniformity coefficient and internal friction angle in a descending order.What’s more,the additional stress decreases with the increase of particle non-uniformity coefficient and internal friction angle,while increases positively with the applied load,with its increment decreasing gradually with the increase of load.

关 键 词：地基 附加应力 散体特征 正交试验 

分 类 号：TU431[建筑科学—岩土工程]