山区机场高填方地基变形分析  

Deformation of high-fill subgrade of airport in mountain areas

作　　者：冯兴 姚仰平[2] 李汝宁 张献民[1] FENG Xing;YAO Yangping;LI Runing;ZHANG Xianmin(School of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;School of Transportation Science and Engineering,Beihang University,Beijing 100083,China;School of Automobile and Transportation,Tianjin University of Technology and Education,Tianjin 300222,China)

机构地区：[1]中国民航大学交通科学与工程学院,天津300300 [2]北京航空航天大学交通科学与工程学院,北京100083 [3]天津职业技术师范大学汽车与交通学院,天津300222

出　　处：《北京航空航天大学学报》2021年第10期2013-2023,共11页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金(51808547,11672015);天津市教委科研计划(2019KJ124);中央高校基本科研业务费专项资金(3122014C014);中国民航大学科研启动基金(2013QD12X)。

摘　　要：目前山区机场大量采用高填方工程,高填方地基沉降变形问题是个亟待解决的重要问题。首先,基于统一硬化(UH)模型,通过研究含石量与内摩擦角和黏聚力的关系,并基于扩展SMP准则和变换应力,将含石量引入到UH模型中,建立了考虑含石量的UH模型;应用当前屈服面与平均主应力轴交点的变化规律作为考虑含石量UH模型加卸载的判断准则,实现了硬化和软化的统一考虑;采用半隐式回映应力更新算法,将加卸载判断准则应用到应力更新算法中,实现了考虑含石量UH模型的有限元应用。其次,应用考虑含石量UH模型的有限元程序,对土石混合料的大型三轴试验进行了计算分析,计算结果和实测结果进行对比,验证了有限元程序的有效性。最后,应用考虑含石量UH模型的有限元程序,对山区机场高填方地基进行了三维有限元分析,得到了地基沉降监测点的竖向位移随时间的变化曲线,并与不考虑含石量UH模型、修正剑桥(MCC)模型计算得到的曲线及工程实测数据进行了比较,得到了高填方地基的竖向位移云图、侧向位移云图、孔隙水压力云图和超静孔隙水压力随时间的变化曲线,从而得到了机场高填方地基的位移和超静孔隙水压力变化规律,说明了考虑含石量UH模型在分析山区机场高填方地基变形方面的合理性。At present,a large number of high-fill projects are used in mountainous airports,and the settlement and deformation of high-fill subgrades is an important issue to be solved.In this paper,based on the Unified Hardening(UH)model,by studying relationships between the stone content and the internal friction angle and cohesion,and based on the extended SMP criterion and transforming stress,the stone content is introduced into the UH model,and the UH model considering stone content is established.The change law of the intersection of the current yield surface and the mean principal stress axis is used as the judgment criterion for loading and unloading of the UH model considering stone content,which makes the unified consideration of hardening and softening be realized.And the semi-implicit back reflection stress update algorithm is adopted.The loading and unloading criterion is applied to the stress update algorithm.And the finite element application of the UH model considering stone content is realized.Then the finite element analysis of the large-scale triaxial test of the soil-stone mixture is carried out by the finite element program of the UH model considering stone content,and the validity of the finite element program is verified by comparing the calculated results of the finite element with the actual test results.Finally,using the finite element program of the UH model considering stone content,the three-dimensional finite element analysis is carried out for the high-fill subgrade of airport in the mountain area,and the vertical displacement curve of the ground settlement monitoring point is obtained.The calculated curves are compared with the curves by the UH model without considering stone content,the Modified Cambridge(MCC)model and the measured data.And the vertical displacement contour,the lateral displacement contour,the pore water pressure contour and the change curve of pore water pressure with time of high-fill subgrade are obtained,and thereby the displacement and pore water pressure change laws of

关 键 词：统一硬化(UH)模型 含石量 有限元 高填方 地基变形 

分 类 号：TU43[建筑科学—岩土工程]