Influence of Shield Construction on Pressure Fluctuation of Segment Grout
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摘要: 为探明盾构隧道同步注浆过程中管片壁后浆液压力不稳定变化的原因，通过对珠海马骝洲隧道工程进行现场测试及施工参数统计，获得了盾构掘进过程中管片外荷载的变化规律与注浆滞后时间；将盾尾视为充满高压液体的密闭容器，盾构推进视为改变容器的边界条件，推导了盾尾体积应变与浆液压力的关系式；并用钱江隧道及Sohpia隧道的监测结果对其适用性进行了验证. 研究结果表明：造成同步注浆过程中管片壁后浆液压力不稳定变化的因素主要包括浆液注入口压力的波动变化，管片脱离盾尾过程中浆液的扩散及施工过程中同步注浆相较于盾构行程的滞后效应；马骝洲隧道注浆相较于盾构推进的平均滞后时间为86 s，当盾尾间隙体积变量为1 × 10–4时浆液压力变化值达到了0.218 MPa，盾构机从静止到掘进的短时间内滞后效应会使管片壁后浆液压力急剧降低的现象得到了验证.Abstract: In order to investigate the cause of slurry pressure instability segment tracking changes in the process of synchronous grouting segment, the variation law of external load of segments and the grouting lag time during shield tunneling were obtained, by means of the field test and construction parameter statistics of the Maliuzhou tunnel project in Zhuhai. The relationship between the volumetric strain of the shield tail and the grouting pressure was deduced by treating the clearance of the shield tail as a closed vessel filled with high pressure liquid and the shield driving as changing the boundary conditions of the vessel.The applicability of the research results was verified by the monitoring results of the Qianjiang tunnel and the Sohpia tunnel. The results show that the fluctuation of slurry injection pressure, the diffusion of serous fluid when the lining is out of the shield, the lag effect in the construction process of synchronous grouting compared with tunnel excavation are the main factors that cause the change of slurry pressure instability behind segment. The average lag time of the grouting phase compared to the shield propelling in the Maliuzhou tunnel is 86 s, when the volumetric variable is 1 × 10–4, the change of slurry pressure reaches to 0.218 MPa, which verify the phenomenon that the lag effect makes the soil pressure behind segment reduced sharply when the shield is pushed from stationary to tunneling.
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Key words:
- shield tunnel /
- grouting pressure fluctuation /
- influence factor /
- field test /
- lag effect
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图 4 盾尾脱环注浆水压力随时间变化关系
Figure 4. Variation of water pressure with time of shield tail ring grouting
图 5 第347环管片外侧水压力及接触压力时程曲线
Figure 5. Time history curve of water pressure and contact pressure of the 347th segment
图 6 第347环管片脱离盾尾时各浆液注入口压力时程图
Figure 6. Injection pressure of each grout when the 347th ring segments escape from the shield tail
图 7 盾构掘进第349、350环时盾构行程、注浆量与时间关系
Figure 7. Relationship between the displacement of the shield，the amount of grouting，and the time when the shield tunneling 349th and 350th segments
图 8 盾尾注浆相较于盾构行程的滞后效应
Figure 8. Hysteresis effect of shield tail grouting in shield tunnel
图 10 钱江隧道施工阶段第二实验环顶部荷载变化
Figure 10. Qianjiang tunnel top load changes in the second experimental ring during shield tunneling
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