基于数值模拟的浅埋偏压小净距隧道施工顺序影响研究
Study on Influence of Construction Sequence in Shallow Tunnel with Bias and Small Net Distance Based on Numerical Simulation
姚宇 1李威 2严晟 3管海进 3陈浩1
作者信息
- 1. 华设设计集团股份有限公司,江苏 南京 210014
- 2. 南京水利科学研究院,江苏 南京 210029
- 3. 苏州市吴中区交通工程建设服务中心,江苏 苏州 215128
- 折叠
摘要
针对七子山浅埋偏压小净距隧道,选取隧道典型位置,建立精细化三维模型,对不同施工顺序下隧道施工过程进行模拟,研究偏压侧先行、偏压侧后行及同时施工三种不同施工顺序对地层变形及结构受力的影响,为施工顺序的确定提供依据.结果表明:偏压侧先行施工工况引起地层位移最大,其次为同时施工工况,偏压侧后行施工工况最小,施工顺序引起地层竖向及水平位移最大变幅分别为15.50%及62.50%,引起支护结构内力最大变幅为 22.63%;考虑施工顺序改变引起的地层位移及结构受力变幅在允许范围内,七子山隧道现场施工采取了左右线同时进洞方案,施工过程和监测数据验证了其合理性.
Abstract
For the shallow tunnel of Qizishan with small net distance bias,the typical locations of the tunnel were selected to establish a fine three-dimensional model,and the tunnel construction process un-der different construction sequences was simulated.The effects of three different construction sequences of bias side first,bias side second and simultaneous construction on the formation deformation and struc-tural stress were studied,which provided a basis for the determination of construction sequence.The re-sults show that the first construction on the bias side causes the largest stratum displacement,followed by the simultaneous construction,and the last is the backward construction on the bias side.The maxi-mum variation of the vertical and horizontal displacement of the stratum caused by the construction se-quence is 15.50%and 62.50%respectively,and the maximum variation of the internal force of the supporting structure is 22.63%.Considering that the formation displacement and structural force varia-tion caused by the change of construction sequence are within the allowable range,the on-site construc-tion of Qizishan tunnel adopts the scheme of simultaneous tunneling of left and right lines,and the cons-truction process and monitoring data verify its rationality.
关键词
岩土工程/施工顺序/数值模拟/偏压隧道/小净距/地层变形Key words
geotechnical engineering/construction sequence/numerical simulation/bias tunnel/small span/formation deformation引用本文复制引用
基金项目
国家自然科学基金资助项目(52378358)
中央高校基本科研业务费专项项目(Y321002)
中央高校基本科研业务费专项项目(Y324001)
江苏省交通运输科技项目计划(2022Y20-2)
出版年
2024
NETL
NSTL
万方数据