Analysis of Construction Disturbance Measurement of Three Lane Rectangular Pipe Jacking Tunnel with Small Clear Distance
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摘要: 依托嘉兴环线下穿南湖大道的1.2 m超小净距三车道特大断面类矩形顶管隧道工程，对实施过程中的管节内力、土压力、顶推力、竖向姿态及其引起的地表沉降等进行了现场实测分析。研究结果表明，双线矩形顶管在后实施隧道掘进过程中管节内力受姿态调整和润滑泥浆作用有所波动，临近隧道施工时前序管节内力存在削弱、增强再恢复的变化过程，最大钢筋应力约增加30%；与常规单线矩形顶管相比，施工引起的地表沉降呈现出较为扁平的peck沉降曲线特性，且最大沉降集中在始发井侧，随顶进距离增加呈现一定拖拽影响；南北线沉降差异主要因素为掘进竖向姿态控制，顶推力并未因小净距而出现较大差异。Abstract: The on-site measurement and analysis were conducted on the internal force, soil pressure, jacking force, vertical attitude, and surface settlement caused by the construction of a 1.2 m ultra-small clear distance three-lane pipe-jacking rectangular tunnel under the Jiaxing Ring Road, which passes through Nanhu Avenue. During the later implementation of tunnel excavation, the internal force of the double line pipe-jacking of rectangular tunnel fluctuated due to posture adjustment and the effect of lubricating mud. As the tunnel construction approaches, the internal force of the previous pipe weakens, strengthens, and then recovers, resulting in a maximum reinforcement stress increase of about 30%; Compared with conventional single-line rectangular pipe jacking, the surface settlement caused by construction exhibits a relatively flat peck settlement curve, and the maximum settlement was concentrated on the originating well side, showing a certain drag effect as the jacking distance increases; The main factor of the settlement difference between the north and south lines was the vertical attitude control of tunneling, and the jacking force did not show a large difference due to the small clearance.
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Key words:
- small clear distance /
- rectangle pipe-jacking /
- disturbance measurement /
- pipe /
- vertical attitude
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表 1 小净距矩形顶管工程案例
序号 项目名称 顶管尺寸/(m×m) 净距/m 1 上海淞沪路地道 9.8×6.3 3.4 2 上海14号线静安寺站 9.9×8.7 2.0 3 郑州中州大道 10.12×7.27 1.0 4 佛山越秀星汇云锦项目 6.9×4.9 0.4 5 郑州中铁装备停车场 5.74×5.02 0.0 
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表 2 主要土层物理力学参数
土层 重度/（kN·m−3） 黏聚力/kPa 内摩擦角/（°） 侧压力系数 ④1粉质黏土 19.31 38 14.6 0.42 ④2砂质粉土 18.98 4.6 30 0.34
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