渗流作用下盾构隧道施工过程中地表沉降预测研究

Study on prediction of ground surface settlement during construction of shield tunnel suffering from seepage

应用数值分析法研究了广州地铁一区间隧道盾构施工过程中渗流对地表沉降的影响。基于Peck横向地表沉降计算理论,将渗流产生的孔隙水压按隧道上覆土的重力归一化处理,且以理论计算所得沉降为标准,对考虑渗流作用的地表沉降进行归一化,提出了耦合渗流作用时最大地表沉降估算方法。与实测及理论计算结果对比分析表明,本文所建立的计算模型和地表沉降修正计算方法合理、有效。

T his paper studied the effect of seepage on ground surface settlement by numerical analysis method during the shield tunnel construction in Guangzhou metro certain interval,normalized the pore pressure produced by seepage according to the tunnel overburden soil gravity based on Peck transverse ground surface settlement calculation theory,concluded the normalization of ground surface settlement under seepage effect by the settlement standard with theoretical calculation,and presented maximum ground surface settlement estimation method coupling the seepage effect. T he numerical model and modified calculation method of ground surface settlement proposed in this paper are reasonable and effective,which could be proved by the comparative analysis of measured and theoretical calculation results.