摘要
依托格库铁路新疆S1标段风积沙包芯路基首件工程,结合包芯路基各部位沙样物理、力学性质的试验数据、现场数据及相应的规范等资料,基于有限元法,建立力学模型,利用Midas GTS/NX软件对该包芯路基、基底进行数值模拟,研究包芯部位、基底及以下风积沙沙样内摩擦角、弹性模量及泊松比等参数影响路基沉降变形的位移云图。结果表明:在一定荷载作用下,风积沙沙样内摩擦角增大时,包芯部位沉降量出现明显减小的趋势,二者为非线性关系;风积沙沙样弹性模量较小时,芯部承受变形的能力也小,引起的沉降量较大;随着风积沙沙样泊松比的增加,路基芯部沉降有增大的趋势,即引起的地层损失越来越大。从这3种情况的位移云图数据可以看出,包芯部位沉降变化明显,最大值达到25.97 mm;基底及以下沉降量较小,最大值只有6.42 mm,该研究为铁路开通运营后路基的养护维修提供理论依据和数据支持。
Based on the primary project of aeolian sand-cored roadbed in Xinjiang S1 section of Golmud-Korla Railway and assisted by the test data,field data and corresponding specifications of the physical and mechanical properties of sand samples in various parts of the cored roadbed,a mechanical model is established by using the finite element method,and Midas GTS/NX software is used to conduct numerical simulation of the cored roadbed and foundation.The displacement nephogram of subgrade settlement deformation affected by internal friction angle of the base and below aeolian rustling sample,elastic modulus and Poisson’s ratio of the core position is studied.The results show that,under certain load,when the internal friction angle of aeolian rustle sample increases,the settlement of the core part decreases significantly,and the relationship between the two is nonlinear;when the elastic modulus of aeolian rustle sample is smaller,the ability of core to bear deformation is also smaller,and the settlement caused by it is larger;with the increase of Poisson’s ratio of wind-blown rustle sample,the settlement of subgrade core tends to increase,namely the stratum loss increases.From the displacement nephogram data of these three cases,it can be seen that the settlement of cored part changes evidently,the maximum is 25.97 mm,and the settlement of the base and below is smaller,the maximum is only 6.42 mm.The research provides theoretical basis and data support for the maintenance of roadbed after railway operation.
作者
陈桂芬
李丽
赵加海
于磊
CHEN Guifen;LI Li;ZHAO Jiahai;YU Lei(Xinjiang Railway Vocational and Technical College,Urumqi 830011,China;Xinjiang Railway Reconnaissance Design Institute Co.,Ltd.,Urumqi 830011,China;The 1st Engineering Co.,Ltd.of China Railway 21st Bureau Group,Urumqi 830011,China)
出处
《铁道标准设计》
北大核心
2022年第9期51-57,共7页
Railway Standard Design
基金
中国铁路乌鲁木齐局集团有限公司科技研究开发计划课题(WLMQ-KGHZGS-HRTL-GGB-2020-0032)。
关键词
铁路路基
包芯路基
有限元法
数值模拟
位移云图
沉降量
railway roadbed
cored subgrade
finite element method
numerical simulation
displacement nephogram
settlement amount
作者简介
陈桂芬(1968-),女,副教授,工学硕士,主要从事铁路路基、铁道线路教学与研究工作,E-mail:745856573@qq.com。
