颗粒材料堆积体的基底压力分布试验研究  

Experimental study on base pressure distribution of accumulations of granular materials

作　　者：王子元 莫品强 胡静 赵子露 肖琼 WANG Ziyuan;MO Pinqiang;HU Jing;ZHAO Zilu;XIAO Qiong(School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;State Key Laboratory for GeoMechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116 China;Anhui University of Science and Technology College of Architecture,Chuzhou 233100,China)

机构地区：[1]中国矿业大学力学与土木工程学院,江苏徐州221116 [2]中国矿业大学深部岩土力学与地下工程国家重点试验室,江苏徐州221116 [3]安徽科技学院建筑学院,安徽滁州233100

出　　处：《岩土工程学报》2024年第S01期158-163,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52178374);广东省自然科学基金项目(2024A1515011552);徐州市基础研究计划项目(KC22019)。

摘　　要：针对颗粒材料堆积体的压力下降问题,研究了点沉积法下不同漏斗高度、颗粒粒径和颗粒形状对基底压力分布的影响。结果显示,基底压力下降现象与内部应力拱有关,且与漏斗高度、颗粒粒径和颗粒形状相关。随着堆积体质量的增加,应力拱稳定性增强,应力凹陷比趋于稳定。漏斗高度距堆顶距离越大,测得的基底压力越大,应力凹陷程度越小。堆积体应力凹陷比随颗粒粒径的增加,呈现先增加后减少的趋势,并在粒径0.6~1.18 mm的堆积体中出现了应力集中现象。随着堆积体质量的增加,标准砂试样的应力凹陷比先增加后减小,而散煤则是一致下降。Addressing the issue of pressure reduction in accumulations of granular materials,the impact of varying funnel heights,particle sizes and particle shapes on the distribution of base pressure is investigated utilizing the point deposition method.The results show that the phenomenon of base pressure reduction is intricately linked to the formation of internal stress arches and influenced by the factors such as the height of the funnel,granulometry of the particles,and morphological characteristics of the granules.With the increase of the accumulations,there is an enhancement in the stability of the stress arches,leading to a convergence towards a steady state of the stress depression ratio.The base pressure measured increases with the increase of the vertical distance from the funnel to the apex of the accumulations,resulting in a decrease of the stress depression.The stress depression ratio within the accumulations exhibits a trend of the initial increase followed by a decrease as the particle size escalates,with a notable occurrence of stress concentration in the accumulations comprised of particles ranging from 0.6 to 1.18 mm in diameter.With the increase in the mass of the accumulations,the stress depression ratio for the standard sand samples initially increases and then decreases,whereas for the loose coal particles,a consistent decline is observed.

关 键 词：堆积体 基底压力 点沉积法 应力凹陷比 

分 类 号：TU441[建筑科学—岩土工程]