| 盾构下穿非连续管线变形特性及预测方法研究 |
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| 引用本文： | 史江伟,范燕波,裴伟伟,陈永辉,张显.盾构下穿非连续管线变形特性及预测方法研究[J].岩土力学,2021(1):143-150. |
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| 作者姓名： | 史江伟 范燕波 裴伟伟 陈永辉 张显 |
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| 作者单位： | ;1.河海大学岩土力学与堤坝工程教育部重点实验室;2.河海大学岩土工程科学研究所;3.温州设计集团有限公司 |
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| 基金项目： | 国家自然科学基金(No.51608170);中央高校基本科研业务费项目(No.B200202082)。 |
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| 摘 要： | 城市地下管线采用承插式接口连接,管线结构的连续性与否取决于接口刚度。然而,现有研究大都假定地下管线为连续结构,忽略了接口转角对管线变形的影响。开展土工离心模型试验和两阶段有限元参数分析,系统研究了盾构下穿不同接口刚度管线的变形特性。发现非连续管线的薄弱接口导致其整体抗弯刚度明显小于连续管线,且接口转动导致非连续管线具有更好的与土体协调变形能力。因此,盾构下穿施工引起的非连续管线沉降明显大于连续管线。非连续管的结构连续性假定将大大低估管线沉降。盾构下穿引起的接口转角与地层损失呈线性关系。基于系统的有限元参数分析,建立了区分相对刚性、柔性管线的无量纲组。针对相对刚性、柔性的非连续管线,分别建立了管节相对长度、管-土相对刚度与接口转角的预测方法,利用离心模型试验结果验证了预测方法的合理性。新方法能有效地预测盾构穿越地下管线的接口转角,研究成果可应用于城市地下管网改造工程。
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| 关 键 词： | 离心模型试验 隧道开挖 非连续管线 接口转角 预测方法 |
An investigation of deformation mechanisms of jointed pipelines due to underneath tunnel excavation |
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| SHI Jiang-wei,FAN Yan-bo,PEI Wei-wei,CHEN Yong-hui,ZHANG Xian.An investigation of deformation mechanisms of jointed pipelines due to underneath tunnel excavation[J].Rock and Soil Mechanics,2021(1):143-150. |
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| Authors: | SHI Jiang-wei FAN Yan-bo PEI Wei-wei CHEN Yong-hui ZHANG Xian |
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| Institution: | (Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210024,China;Geotechnical Research Institute,Hohai University,Nanjing,Jiangsu 210024,China;Wenzhou Design Assembly Company Ltd.,Wenzhou,Zhejiang 325000,China) |
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| Abstract: | The underground pipelines are connected by socket joints, and the continuity of the pipeline depends on joint rigidity. However, previous studies mainly simplified pipelines as continuous structures, and the effect of joint rotation on pipeline deformation mechanisms was ignored. By conducting centrifuge model tests and two-stage numerical parametric studies, tunneling-induced deformation mechanisms of pipelines with different joints stiffness are explored in this study. Because of the existence of flexible joints, overall flexural stiffness of jointed pipelines is much smaller than that of continuous ones. Moreover, tunneling-induced joint rotation results in jointed pipelines to have a better ability to deform with surrounding soils. Thus, tunneling-induced settlement in jointed pipelines is much larger than that of continuous pipelines. By simplifying jointed pipelines as continuous structures, tunneling-induced pipeline settlement is grossly underestimated. A linear relationship between the joint rotation angle and volume loss is observed. Based on parametric studies, a dimensionless group of relative pipeline-soil stiffness is established to differentiate relatively rigid and flexible pipelines. Calculation charts between the relative values of the length of pipe segment, pipe-soil stiffness and joint rotations are established for relatively rigid and flexible pipelines, respectively. Centrifuge test results are used to verify the proposed calculation charts. The proposed method can effectively predict the joint rotation angle due to tunnel excavation. Research finding from this study can be used in underground pipeline network reconstruction projects in urban cities. |
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| Keywords: | centrifuge modeling tunnel excavation jointed pipelines joint rotation prediction method |
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