隧道开挖引起地层变形的解析方法参数确定

Parameter Determination of Analytical Method for Stratum Deformation Caused by Tunnel Excavation

基于Verruijt和Sagaseta提出的隧道开挖引起地层变形的解析方法,结合土力学和弹性力学的基本原理,提出一种确定解析过程中待定参数的方法。该方法不需要现场实测变形值,通过地质资料即可确定待定参数,从而得到整个地层任意一点的变形值。经工程实例验算,采用该方法获取待定参数后,求得的地表最大沉降解析值与实测值偏差在5.0%以内,且解析结果能够真实反映隧道开挖引起的地层变形规律。现场实测数据不足时,采用该方法估算地层变形比较适用,且解析值比实测值略大,更安全。

Based on the analytical method of stratum deformation caused by tunnel excavation proposed by Verruijt and Sagaseta,combined with the basic principles of soil mechanics and elastic mechanics,a method to determine the undetermined parameters in the analytical process was proposed.This method does not need the field measured deformation value,and the undetermined parameters can be determined through the geological data,so as to obtain the deformation of any point of the whole stratum.Through the checking calculation of an engineering example,after obtaining the parameters to be determined by this method,the deviation between the analytical value of the maximum surface settlement obtained and the measured value is within 5.0%,and the analytical result can truly reflect the laws of stratum deformation caused by tunnel excavation.When the field measured data is insufficient,this method is more suitable for estimating the stratum deformation,and the analytical value is slightly larger than the measured value,which is safer.