铁道标准设计
鐵道標準設計
철도표준설계
Railway Standard Design
2015年
10期
94-98
,共5页
盾构隧道%深厚饱和软土%循环累积变形%循环三轴试验%简化动力有限元%分层总和法%列车荷载%运营期沉降
盾構隧道%深厚飽和軟土%循環纍積變形%循環三軸試驗%簡化動力有限元%分層總和法%列車荷載%運營期沉降
순구수도%심후포화연토%순배루적변형%순배삼축시험%간화동력유한원%분층총화법%열차하재%운영기침강
Shield tunnel%Deep saturated soft soil%Circulating cumulative deformation%Cyclic tri-axial test%Simplified dynamic FEM%Layer-wise summation method%Train load%Operation period settlement
软土地层盾构隧道运营期沉降一直是工程界关注的重点问题。结合工程实例，采用不排水循环累积变形理论、循环三轴试验参数和简化动力有限元及分层总和法，分析深厚软土地层盾构隧道在运营期列车荷载作用下沉降响应。分析成果表明，隧道埋深越浅、隧底软土地层越厚，则运营期沉降越大；就沉降速率来看，隧道在运营期最大沉降速率将在隧道运营后的初期出现，且地层越差，沉降量越大，沉降速率越小，沉降稳定时间越长；采取一定沉降控制措施后，深厚软土地层盾构隧道在运营期列车循环荷载作用下的沉降是可控的。针对本项目的特点，结合分析成果，合理确定深厚软土地层盾构隧道沉降控制措施。
軟土地層盾構隧道運營期沉降一直是工程界關註的重點問題。結閤工程實例，採用不排水循環纍積變形理論、循環三軸試驗參數和簡化動力有限元及分層總和法，分析深厚軟土地層盾構隧道在運營期列車荷載作用下沉降響應。分析成果錶明，隧道埋深越淺、隧底軟土地層越厚，則運營期沉降越大；就沉降速率來看，隧道在運營期最大沉降速率將在隧道運營後的初期齣現，且地層越差，沉降量越大，沉降速率越小，沉降穩定時間越長；採取一定沉降控製措施後，深厚軟土地層盾構隧道在運營期列車循環荷載作用下的沉降是可控的。針對本項目的特點，結閤分析成果，閤理確定深厚軟土地層盾構隧道沉降控製措施。
연토지층순구수도운영기침강일직시공정계관주적중점문제。결합공정실례，채용불배수순배루적변형이론、순배삼축시험삼수화간화동력유한원급분층총화법，분석심후연토지층순구수도재운영기열차하재작용하침강향응。분석성과표명，수도매심월천、수저연토지층월후，칙운영기침강월대；취침강속솔래간，수도재운영기최대침강속솔장재수도운영후적초기출현，차지층월차，침강량월대，침강속솔월소，침강은정시간월장；채취일정침강공제조시후，심후연토지층순구수도재운영기열차순배하재작용하적침강시가공적。침대본항목적특점，결합분석성과，합리학정심후연토지층순구수도침강공제조시。
Shield tunnel settlement in deep soft soil has been concerned as a key problem in engineering. With reference to engineering practices, this paper analyzes the settlement response of shield tunnel in deep soft soil under dynamic load of train by means of the theory of non-drainage circulating cumulative deformation, parameters of cyclic tri-axial test, simplified dynamic FEM and layer-wise summation. The results illustrate that the shallower of tunnel depth and the thicker of soft soil under the bottom of shield tunnel and the larger of the settlement during operation; the maximum settlement rate occurs during the initial stage of the operation;the softer of soil, the larger of settlement;the slower of settlement rate, the longer the stability time of settlement. The implementation of settlement control measures show that the settlement of shield tunnel under cyclic loading of train during operation in the soft soil is controllable. Reasonable settlement control measures for shield tunnel in deep soft soil are determined based on project characteristics and analysis results.
