地铁盾构施工引起的公路路面开裂影响因素研究

Research on influential factors of cracks on roadbeds caused by subway shield construction

地铁盾构施工导致路面沉降和水平位移,当路面沉降和水平位移的变化超过路面材料强度时,路面发生开裂,严重影响路面的使用寿命和通行效率。基于Gaussian公式研究路面沉降和应变曲线,对双线隧道开挖导致的路面开裂位置进行分析并与实测结果进行对比,发现该方法可用于评估隧道开挖导致的上方路面开裂,同时对引起路面开裂的参数因素进行了对比分析,研究成果对城市隧道开挖过程中的路面保护具有参考意义。

The paper indicates the subway shield construction leads to the roadbed settlement and horizontal displacement, illustrates when the changes in the roadbed settlement and horizontal displacement surpass the strength of the roadbed materials, the cracks on roadbeds will affect tile lifespan and traffic efficiency of the roadbed, analyzes the roadbed crack location caused by the excavation of the double-line tunnels based on the Gaussian fornmla to research the roadbed settlement and strain curve, undertakes the comparison of the tested results, illustrates the method can be utilized in evaluating the upper roadbed cracks caused by the tunnel excavation, has the comparative analysis of the parameter caused by the roadbed cracks, and points out the research result is meaningful for the roadbed protection in the urban tunnel excavation.