泥炭质土地区盾构隧道列车运营期沉降研究  

Study on the Settlement of Shield Tunnel Trains During Operation Period in Peat Soil Regions

作　　者：许坤 谢建斌 曾林瑶 陆子豪 刘思楠 宋桂丽 XU Kun;XIE Jianbin;ZENG Linyao;LU Zihao;LIU Sinan;SONG Guili(School of Architecture&Planning,Yunnan Univ.,Kunming 650500,China;Kunming Junlong Rock Engineering Co.Ltd,Kunming,650500,China;School of Mathematics&Statistics,Yunnan Univ.,Kunming 650500,China;Yunnan Hualing Architectural Design Co.Ltd.,Kunming 650216,China)

机构地区：[1]云南大学建筑与规划学院,昆明650500 [2]昆明军龙岩土工程有限公司,昆明650021 [3]云南大学数学与统计学院,昆明650500 [4]云南华凌建筑设计有限公司,昆明650216

出　　处：《三峡大学学报（自然科学版）》2021年第1期71-75,共5页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金资助项目(11862024、51264037)。

摘　　要：为研究运营期列车振动荷载作用下盾构隧道地基土体的沉降特性,本文以昆明地铁二号线二期工程某区间隧道为例,结合地质勘察资料,建立Midas GTS NX三维有限元模型,通过人工激励函数对模型施加动力荷载,分析了列车满载高速的情况下,隧道周边土体的沉降特征,结合经验模型公式,预测了隧道在长期循环荷载作用下基底土体的沉降变形.研究结果表明:在长期列车振动荷载作用下,隧道周围土体发生被迫振动,类似作简谐运动;土体的沉降幅值随与振源距离的增加而减小;线路运营期基底土体沉降呈指数型增长,最终趋于稳定,第一年沉降16.9 mm,达前10年累计沉降的67.6%.为保障线路的安全运营,应重点加强隧道运营期前期的监测养护.In order to study the settlement characteristics of the foundation soil of the shield tunnel under the vibration load of the train during the operation period,this article takes a certain section of the tunnel in the second phase of the Kunming Metro Line 2 as an example,and combines the geological survey data to establish the Midas GTS NX three-dimensional finite element model.The dynamic load was applied to the model through an artificial excitation function.The settlement characteristics of the soil around the tunnel under full-load and high-speed train conditions were analyzed.Combined with the empirical model formula,the settlement deformation of the base soil under the long-term cyclic load of the tunnel was predicted.The research results show that:under the long-term train vibration load,the soil around the tunnel is forced to vibrate,similar to a simple harmonic motion;the settlement amplitude of the soil decreases with the increase of the distance from the vibration source;the settlement of the base soil during the line operation period first increased exponentially and eventually stabilized.The settlement of the first year was 16.9 mm,which was 67.6%of the accumulated settlement in the previous decade.In order to ensure the safe operation of the line,the monitoring and maintenance of the tunnel should be strengthened in the early stage of operation.

关 键 词：泥炭质土 盾构隧道 列车荷载 有限元模拟 沉降 

分 类 号：TU433[建筑科学—岩土工程]