粉质黏土地层盾构隧道上跨输油管线施工影响
魏义山1李龙1刘霆宇2王树英2
Construction Impact of Shield Tunneling Over-passing Oil Pipelines in Silty Clay Strata
WEI Yishan1LI Long1LIU Tingyu2WANG Shuying2
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作者信息:1.中交第三航务工程局有限公司南京分公司， 210011， 南京；
2.中南大学土木工程学院， 410075， 长沙
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Affiliation:1.Nanjing Branch of CCCC Third Harbor Engineering Co., Ltd., 210011, Nanjing, China;
2.School of Civil Engineering, Central South University, 410075, Changsha, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20245774
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中图分类号/CLCN:U456.3∶U455.43
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栏目/Col:土建工程
摘要:
［目的］盾构法施工难免遇到上跨地下管线的情况。若控制不当，则存在管线破损、油气泄漏等风险。因此，有必要对盾构上跨地下管线的施工影响及控制进行研究。［方法］以南京地铁6号线栖霞山出入段线的盾构施工为工程背景，基于现场实测结果，分析粉质黏土地层盾构双线上跨输油管施工引起的管线及地面变形特征。［结果及结论］盾构机上跨输油管线过程中，管线变形规律表现为先隆起、再回落，随后再次隆起直至最终稳定。其中，管线隆起受隧道土体开挖卸载影响，而后发生的回落由同步注浆引起；注浆量越大，回落幅度越大。地面沉降受地层损失影响，而地面隆起由较大的土舱压力与同步注浆压力导致。各施工阶段的管线与地面变形响应节点同最大位移值近似，各施工阶段下同步注浆对管线变形的影响幅度更大(波动值可达20 mm)；双线上跨期间管线变形最大值为16 mm，地面变形最大值为10 mm，二者均在施工可控范围之内。
Abstracts:
［Objective］ Shield tunneling method construction inevitably encounters conditions of over-passing existing underground pipelines. If not properly treated, this situation may pose risks such as pipeline damage and oil-gas leakage. Therefore, it is necessary to study the construction impact and control measures of shield tunneling over-passing underground pipelines. ［Method］ Taking the shield tunneling section of Qixia Mountain Depot access lines on Nanjing Metro Line 6 as the engineering background, and based on field monitoring data, the deformation characteristics of the pipeline and ground surface caused by twin shield tunnels over-passing an oil pipeline in silty clay strata are analyzed. ［Result & Conclusion］ During the process of the shield machine over-passing the oil pipeline, the pipeline deformation exhibited a pattern of initial uplift, followed by falling back, and then a second uplift until final stabilization. Among them，the initial uplift is caused by soil unloading during tunnel excavation, while the subsequent subsidence is induced by synchronous grouting; the greater the grout volume, the greater the falling back amplitude. Land subsidence is influenced by stratum loss, while surface uplift is caused by high chamber pressure and grouting pressure. The pipeline and ground deformation response nodes at each construction stage exhibit approximate the maximum displacement values. Among these, the synchronous grouting at each construction stage has a more significant impact on pipeline deformation (with fluctuations reaching up to 20 mm). During the twin shield tunneling over-passing, the maximum pipeline deformation is 16 mm and the maximum ground deformation is 10 mm-both within the controllable range of construction.
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