论文部分内容阅读
盾构施工引起地层变形的众多计算方法中,随机介质理论法和Peck法是我国应用较为广泛的两种实用方法,但这两种方法的计算参数均不太容易确定。根据46例工程实测资料,绘制出地表最大沉降与隧道相对埋深的关系图。结果表明:当盾构隧道相对埋深小于5时,盾构施工引起的地表最大沉降值变化较大;当盾构隧道相对埋深大于5时,其对地表最大沉降的影响较小。对于大部分浅埋城市地铁隧道而言,应该考虑盾构隧道相对埋深对地层变形的影响。基于盾构施工引起地层移动不均匀模型的地表最大沉降计算式,依据随机介质理论法和Peck法,推导出考虑土质软硬、隧道半径和埋深影响的地层变形实用计算方法,并通过对5个工程实例的分析,验证此计算方法的合理性。
Among the many calculation methods of shield deformation caused by shield construction, stochastic medium theory and Peck method are two practical methods widely used in China. However, the calculation parameters of these two methods are not easy to determine. According to the measured data of 46 cases, the relationship between the maximum settlement of the earth’s surface and the relative depth of the tunnel is plotted. The results show that when the relative depth of shield tunnel is less than 5, the maximum settlement of ground surface caused by shield construction varies greatly. When the relative depth of shield tunnel is greater than 5, the influence of shield tunneling on the maximum settlement is small. For most of the urban subway tunnels with shallow depths, the influence of shield tunnel relative depth on formation deformation should be considered. Based on stochastic media theory and Peck method, a practical calculation method of strata deformation considering the influence of soil soft and hard, radius of tunnel and depth of burial is deduced based on the calculation formula of maximum surface subsidence induced by shield construction inhomogeneous model. An engineering example of the analysis to verify the rationality of this calculation method.