航油储罐珊瑚砂地基变形特性研究  

Deformation characteristics of coral sand foundation of aviation oil storage tank

作　　者：张小燕 李吉 蔡燕燕[2] 张晋勋[3] ZHANG Xiao-yan;LI Ji;CAI Yan-yan;ZHANG Jin-xun(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Institute of Geotechnical Engineering,Huaqiao University,Xiamen,Fujian 361021,China;Beijing Urban Construction Group Co.,Ltd.,Beijing 100088,China)

机构地区：[1]中国矿业大学(北京)力学与土木工程学院,北京100083 [2]华侨大学岩土工程研究所,福建厦门361021 [3]北京城建集团有限责任公司,北京100088

出　　处：《岩土力学》2024年第12期3738-3747,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52178375,No.52211530088,No.51809264);中央高校基本科研业务费(No.2024ZKPYLJ03)。

摘　　要：珊瑚砂广泛应用于岛礁吹填工程中,其与陆源砂的物理力学性质截然不同。为探究吹填珊瑚砂地基变形机制,对珊瑚砂开展了级配、孔隙比和加载方式等因素耦合作用下的侧限压缩试验。珊瑚砂的初始颗粒级配对压缩变形特性影响较大,且颗粒破碎明显。砾砂的初始孔隙比越大压缩性也越大,珊瑚砂的变形主要由孔隙的移动填充为主,伴有少量的颗粒破碎,均为不可恢复的塑性变形,因此,珊瑚砂的回弹指数仅为黏土的1/10。运用Plaxis 3D软件建立了航油储罐的三维模型,基于室内试验获得的力学参数,研究了航油储罐工程珊瑚砂地基在加卸载循环荷载作用下的变形规律,并与马尔代夫易卜拉欣·纳西尔国际机场的航油储罐工程实测数据进行了对比,验证了该模型的准确性。在航油储罐的最大储油量下,珊瑚砂地基达到最大变形量。在该荷载水平下,多次加卸载不会导致变形进一步发展。研究成果对工程安全控制有一定的指导意义。Coral sand is widely used in island and reef reclamation projects,but its distinct physical and mechanical properties compared to land-based sand.To explore the deformation mechanism of hydraulic filled coral sand foundation,oedometer tests were conducted on coral sand,considering the combined effects of factors such as gradation,porosity,and loading methods.The initial particle size distribution of coral sand significantly impacts its compression deformation characteristics,with noticeable particle breakage.A larger initial void ratio in gravel sand results in greater compressibility.The deformation of coral sand primarily involves pore filling by particle movement,accompanied by minor particle breakage,all of which are irreversible plastic deformations.Consequently,the unloading index of coral sand is only 1/10 that of clay.Finally,a three-dimensional model of the aviation oil storage tank was created using Plaxis 3D software.Using mechanical parameters obtained from laboratory experiments,the deformation of the coral sand foundation in aviation oil storage tank engineering under cyclic loading and unloading was studied.The model’s accuracy was validated by comparing it with the monitoring results of the aviation fuel storage tank project at Maldives’Ibrahim Nasir International Airport.At the maximum storage capacity of the aviation oil storage tank,the coral sand foundation reaches its peak deformation.At this load level,multiple loading and unloading cycles will not cause further deformation,providing valuable guidance for engineering safety control.

关 键 词：大型储罐 珊瑚砂 不均匀沉降 有限元模拟 

分 类 号：TU475[建筑科学—结构工程]