不同压实条件下富水粉土道基变形规律的数值研究  

Numerical study on the deformation law of water-rich silt road base under different compaction conditions

作　　者：刘兆鹏 徐西永 寇璟媛 蒋义 易文妮 马新岩 LIU Zhaopeng;XU Xiyong;KOU Jingyuan;JIANG Yi;YI Wenni;MA Xinyan(China Airport Planning&Design Institute Co.,Ltd.,Beijing 100029,China;Shandong Airport Management Group Co.,Ltd.,Jinan 250107,Shangdong,China;School of Civil Engineering,Central South University,Changsha 410075,Hunan,China)

机构地区：[1]民航机场规划设计研究总院有限公司,北京100029 [2]山东省机场管理集团有限公司,山东济南2501072 [3]中南大学土木工程学院,湖南长沙410075

出　　处：《水利水电技术（中英文）》2024年第S01期397-405,共9页Water Resources and Hydropower Engineering

基　　金：湖南省自然科学基金项目(2021JJ40770)

摘　　要：传统基于有限元的数值方法很难对长期飞机荷载作用下粉土道基的变形演化进行计算。建立一种考虑土体干密度影响的重塑饱和粉土边界面模型,利用带误差控制的显式积分算法,将其写成可供有限元软件调用的用户自定义材料子程序,以此建立单元土体固结不排水动三轴试验进行模拟,验证模型具备描述饱和粉土的动力特性。随后建立分层压实和不同压实度的跑道数值模型,对飞机循环荷载作用下的道基变形进行了数值分析。结果表明,随着循环次数的增加,道基变形虽持续增加,但发展速率逐渐减小,循环加载50次后粉土道基变形基本稳定;94%压实度道基模型经历相同的循环加载次数后累积塑性位移小于分层压实模型,表明虽然在实际工程中往往通过分层压实的方法降低造价,但在一定荷载影响范围内,仍然需要将压实度严格控制。Traditional finite element-based numerical method are difficult to calculate the deformation evolution of a chalky soil roadbed under long-term aircraft loading.A boundary surface model of remoulded saturated chalk is established by considering the effect of soil dry density,and the explicit integration algorithm with error control is written as a user-defined material subroutine that can be called by the finite element software,which establishes a unit of soil consolidation and undrained triaxial test for simulation to validate that the model has the ability to describe the dynamic characteristics of the saturated chalk.Subsequently,a numerical model of the runway with layered compaction and different degrees of compaction was established to numerically analyse the deformation of the roadbed under the cyclic loading of an aircraft.The result show that,with the increase of cyclic loading,the deformation of the runway base increases,but the development rate decreases gradually,and the deformation of the runway base is basically stable after 50 times of cyclic loading;the cumulative plastic displacement of the runway base model with 94%compaction is smaller than that of the layered compaction model,which indicates that,although the cost is often reduced by the method of layered compaction in the actual project,it still needs to be strictly controlled by the compaction degree in a certain range of the loading influence.Although the cost is often reduced by compaction,within the range of certain loads,the compaction still needs to be strictly controlled.

关 键 词：粉土道基 飞机荷载 循环加载 压实度 边界面模型 数值研究 

分 类 号：TU433[建筑科学—岩土工程]