地铁移动荷载作用下地基沉降的弹塑性分析
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摘要
土体本构、隧道-地基模型与地铁荷载模拟是长期地铁移动荷载作用下地基土沉降研究的三个关键因素。本文以Drucker-Prager塑性本构模型表示土体应力-应变关系,采用与不平顺管理标准相应的激振力来模拟列车竖向动荷载,使用FLAC3D软件建立了地基结构的空间模型,详细探讨地铁隧道地基土沉降在不同加载次数下的动力反应和沉降规律。研究结果表明:埋深对地基土沉降的影响明显,随着埋深的减少,地基土的沉降逐渐增加;对于长期动荷载作用下的地基变形问题,采用塑性本构模型更能符合实际工况。
The soil constitutive model,tunnel-foundation model and simulation of the subway load are three critical factors of the foundation settlement problems caused by long-time subway moving load.In his paper,the Drucker-Prager model,a plastic constitutive model was adopted to represent the stress strain relationship of soil.The exciting force corresponding to the unsmooth management standard was adopted to simulate the vertical subway load.Spatial model of foundation structure was established using FLAC3D software.Then a detailed analysis was performed on the dynamic response of the foundation that subjected to subway load with different running times.The results show that buried depth of strata have great influence on the foundation settlement,the foundation settlement increases gradually with the reducing buried depth.For the foundation deformation caused by long-term moving load,the plastic constitutive model is more appropriate for describing irrecoverable,long-time and cumulative foundation settlement.
The soil constitutive model,tunnel-foundation model and simulation of the subway load are three critical factors of the foundation settlement problems caused by long-time subway moving load.In his paper,the Drucker-Prager model,a plastic constitutive model was adopted to represent the stress strain relationship of soil.The exciting force corresponding to the unsmooth management standard was adopted to simulate the vertical subway load.Spatial model of foundation structure was established using FLAC3D software.Then a detailed analysis was performed on the dynamic response of the foundation that subjected to subway load with different running times.The results show that buried depth of strata have great influence on the foundation settlement,the foundation settlement increases gradually with the reducing buried depth.For the foundation deformation caused by long-term moving load,the plastic constitutive model is more appropriate for describing irrecoverable,long-time and cumulative foundation settlement.
引文
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[2]Seed H B,Clarence K C.Clay strength under earth-quake loading condition[J].Journal of the Soil Me-chanics and Foundations Division(ASCE),1966,92:53-78.
[3]Monismith C L,Ogawa N,Freeme C R.Permanentdeformation characteristics of subgrade soils due to re-peated loading[J].Transportation Research Board,1975,537:1-17.
[4]Kaynia A M,Madhus C,Zackrisson P.Ground vibra-tion from high-speed trains:prediction and counter-measure[J].Journal of Geotechnical Geoenvironmen-tal Engineering,2000,126(6):531-537.
[5]郑永来,李美利,王明洋,等.软土隧道渗漏对隧道及地面沉降影响研究[J].岩土工程学报,2005,27(2):243-247.
[6]梁波,蔡英.不平顺条件下高速铁路路基的动力分析[J].铁道学报,1999,21(2):84-88.
[7]孔戈.盾构隧道地震响应分析及抗减震措施研究[D].上海:同济大学,2007.
[8]王国波.软土地铁车站结构三维地震响应计算理论与方法的研究[D].上海:同济大学,2007.
[9]黄腾,孙景领,陶建岳,等.地铁隧道结构沉降监测及分析[J].东南大学学报(自然科学版),2006,36(2):262-266.
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