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隧道建设（中英文） ›› 2020, Vol. 40 ›› Issue (S2): 289-296.DOI: 10.3973/j.issn.2096-4498.2020.S2.037

• 施工技术 • 上一篇    下一篇

富水砂层土压平衡盾构小半径曲线始发掘进参数控制研究

安斌1， 刘学霸1， 杨春勃1， 王祖贤2   

  1. （1. 中铁隧道集团二处有限公司, 河北 三河 065201； 2. 中南大学土木工程学院， 湖南 长沙 410075）
  • 出版日期:2020-12-31 发布日期:2021-03-22
  • 作者简介:安斌（1990—），男，山西介休人，2014年毕业于石家庄铁道大学，隧道与地下工程专业，本科，工程师，现从事城市轨道交通建设项目技术管理工作。E-mail: 360031759@qq.com。

Study on Tunneling Parameters Control for EPB Shield Launching along a Smallradius Curve in Waterrich Sandy Stratum

AN Bin1, LIU Xueba1, YANG Chunbo1, WANG Zuxian2   

  1. (1. The 2nd Engineering Co., Ltd. of China Railway Tunnel Group, Sanhe 065201, Hebei, China; 2. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China)

  • Online:2020-12-31 Published:2021-03-22

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摘要： 盾构始发是盾构施工的关键环节，也是盾构施工时的高风险环节。为给南昌地区富水砂层条件下盾构曲线始发施工提供掘进参数设置样本，以南昌市轨道交通3号线绳金塔站—六眼井站盾构始发工程为背景，对富水砂层盾构小半径曲线始发段主要掘进参数进行统计分析，确定相关参数的优势区间，并基于盾体姿态控制参数和地表沉降进行掘进参数控制效果评价。结果表明： 1）盾构水平方向2组油缸推力在曲线段和直线段变化差异明显，线路平曲线半径越小，差值越大，在左右线曲线段和直线段水平方向2组油缸推力分别相差872%和758%； 2）线路平曲线半径越小，所需的总推力和刀盘转矩越大，而掘进速度略有降低，左右线总推力均值为1 3976 t和1 6717 t，刀盘转矩均值为3 1011 kN·m和3 7239 kN·m，掘进速度均值为388 mm/min和351 mm/min； 3）由于始发段掘进断面地层相对均一，土舱压力基本随隧道埋深呈线性增加，而由于右线曲线半径更小，因此右线土舱压力离散程度相对较高； 4）左右线盾尾注浆量差异不大，优势区间均为3~6 m3，均值约为4 m3； 5）左右线曲线始发段水平方向盾体姿态超限率分别为2%和4%，地表累积沉降最大值仅为625 mm，表明本工程小半径曲线始发段掘进参数控制效果较好，掘进参数对地层条件和线路线型具有良好的适应性。

关键词: 土压平衡盾构, 富水砂层, 小半径曲线始发, 掘进参数

Abstract:  Shield launching is a key link in shield tunneling, and also a highrisk link. Based on the shield launching project of Shengjinta StationLiuyanjing Station of Nanchang Rail Transit Line 3,  a statistical analysis on the main tunneling parameters of the shield launching along a smallradius curve in the waterrich sandy stratum is conducted, and the advantage interval of related parameters are determined. Finally, based on the shield attitude control parameters and surface subsidence, the driving parameters control effect is evaluated. The results show the following. (1) In the horizontal direction, there is a significant difference between the two groups of cylinder thrust changes in the curved section and the straight section. The smaller the radius of the line horizontal curve, the greater the difference. The thrust differences of the two groups of cylinders in the horizontal direction of the left and right line in curved and straight section are 87.2% and 75.8% respectively. (2) The smaller the horizontal curve radius, the greater the total thrust and cutterhead torque, while the tunneling speed is slightly reduced. The average total thrusts of the left line and the right line are 1 397.6 t and 1 671.7 t, the average cutterhead torques are 3 101.1 kN·m and 3 723.9 kN·m, and the average tunneling speed is 38.8 mm/min and 35.1 mm/min, respectively. (3) As the stratum of the excavation section of the initial section is relatively uniform, the pressure of the soil chamber increases linearly with the buried depth of the tunnel, and due to the smaller radius of the curve on the right line, the dispersion degree of the soil chamber pressure is relatively high. (4) The grouting amounts of shield tail on the left and right lines vary little, and the dominant interval is 3~6 m3, with an average of about 4 m3. (5) The horizontal shield posture overrun rates of the initial section in the left and right line are only 2% and 4% respectively, and the maximum accumulated surface settlement is only 6.25 mm, which indicates that the control effect of driving parameters in the launching section in smallradius curve in this project is good, and the driving parameters have good adaptability to stratum conditions and line type.

Key words: earth pressure balance shield, waterrich sandy stratum, launching along a smallradius curve, tunneling parameters

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