考虑盾构隧道壁后间隙与注浆分布模式的地表沉降随机预测方法

发布时间：2018-11-09 18:45

【摘要】：盾构隧道施工中的壁后间隙、注浆分布模式、开挖面土体变形是影响地表沉降的三个主要因素,而这些因素又与地层条件和施工工艺密切相关,但现有研究中对这些因素量化分析的成果较少。文章基于随机介质理论,将上述三个影响因素分别用等效间隙量Δ1、等效间隙分布角α和负土体损失量Δ2来表示,推导出了盾构隧道施工中三维地表沉降预测公式,并将计算参数Δ1和α对地表沉降的影响进行量化分析;同时,根据实际工程中的沉降监测数据对参数取值进行反演分析,得出了盾构隧道施工中预测地表沉降的三维解。将文章提出方法的计算值与实测沉降值、修正Peck公式的计算值分别进行对比发现,该方法能更真实地预测实际地表沉降的大小和分布特征,证明了提出方法的合理性和反分析参数的可靠性。
[Abstract]:The backwall clearance, grouting distribution pattern and soil deformation of excavated surface are the three main factors that affect the ground settlement in shield tunnel construction, and these factors are closely related to the formation conditions and construction technology. However, the quantitative analysis of these factors in the existing research results are less. Based on the theory of random medium, the above three influencing factors are represented by equivalent clearance 螖 1, equivalent gap distribution angle 伪 and negative soil loss 螖 2, respectively, and the three dimensional ground subsidence prediction formula in shield tunnel construction is derived. The effects of calculation parameters 螖 1 and 伪 on surface subsidence are analyzed quantitatively. At the same time, according to the settlement monitoring data in the actual engineering, the parameters are inversed and analyzed, and the three-dimensional solution to predict the surface settlement in the shield tunnel construction is obtained. By comparing the calculated values of the proposed method with the measured settlement values and the calculated values of the modified Peck formula, it is found that the proposed method can more truly predict the size and distribution characteristics of the actual surface subsidence. The rationality of the proposed method and the reliability of the back analysis parameters are proved.
【作者单位】：广西交通投资集团有限公司;中国十九冶集团有限公司;
【基金】：青年科学基金项目(51508037)
【分类号】：U455.43

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