隧道施工中地表沉降变形监测及数值模拟研究

Study on Surface Settlement Deformation Monitoring and Numerical Simulation in Tunnel Construction

文中利用有限元模拟法建立了隧道的仿真模型,分析了不同隧道断面的变形特征及支护结构内部力学响应,并与实测值进行对比。结果表明,K32+700及K33+900断面处的最大地表沉降量分别为23.5及20.5 mm。隧道断面的塑性区主要位于隧道拱顶、拱脚和仰拱的底部。K32+700位置处的实测值和模拟值最为接近,K33+900实测值与模拟值的误差在10%以内,验证了文中所建模型的可靠性。

In this paper,the finite element simulation method is used to establish a tunnel simulation model,analyze the deformation characteristics of different tunnel sections and the internal mechanical response of the supporting structure,and compare with the measured values.The results show that the maximum surface subsidence at K32+700 and K33+900 sections is 23.5 and 20.5 mm,respectively.The plastic zone of the tunnel section is mainly located at the bottom of the tunnel arch,arch foot and invert.The measured value at K32+700 is the closest to the simulated value,and the error between the measured value and the simulated value at K33+900 is less than 10%,which verifies the reliability of the model.