浅埋暗挖隧道引起建筑物沉降的预测方法

Prediction Method for Settlement of Buildings Caused by Shallow Buried Tunneling

在考虑建筑物刚度的情况下,得到浅埋暗挖隧道引起建筑物沉降的预测方法,通过利用弹性地基梁原理,将经验公式法计算得到的浅埋暗挖隧道地表沉降值转换成沉降反力,再利用MIDAS-GEN软件计算沉降反力引起的建筑物沉降。利用工程实例验证该方法的可靠性,分析隧道与建筑物相对位置、基床系数、建筑物刚度以及土体损失率的影响规律。结果表明:该方法的计算结果与实测值比较吻合;建筑物沉降曲线的斜率随建筑物与隧道之间距离的增大而增大;建筑物沉降值随k的增大而减小;随建筑物刚度的增大,沉降曲线趋于直线变化,建筑物沉降差变小;随着土体损失率的增大,沉降曲线的斜率越来越大。可见该方法具有一定的可行性。

In consideration of the stiffness of the building,the prediction method of building settlement caused by shallow buried tunnel is obtained.By using the principle of elastic foundation beam,the surface settlement value of shallow buried tunnel is converted to settlement counterforce by the empirical formula method,and the settlement of building caused by settlement reaction is calculated by using MIDAS-GEN software.Combined with engineering practice,the reliability of the method is verified,and the 4 factors affecting the relative position of tunnel and building,coefficient of foundation,stiffness of building and loss rate of soil are analyzed.The results show that this method can get the calculation results and the measured value;when the building and tunnel distance farther,the greater the slope curve of building settlement;the settlement value of the building decreases with the increase of the coefficient of the foundation bed;building stiffness increases that settlement curve is linear change;with the increase of the rate of soil loss,the building subsidence increases,and the settlement of the slope of the curve is more and more big.It can be seen that this method is feasible.