高速铁路列车振动荷载对下穿隧道地层动力响应分析

以某隧道下穿高速铁路项目为背景,隧道下穿高速铁路施工为特级风险源,对地层沉降要求极为严格。对隧道下穿施工期间,在列车振动荷载作用下产生的地层动力响应进行了三维数值模拟分析。数值模拟计算结果表明,下穿隧道与高铁路基交叉点处为该工程薄弱环节,在设计与施工过程中需对此处采取加强措施,以保证施工安全及不影响列车正常运行。

Analysis on Stratum Dynamic Response to Train Vibration Load When Tunneling below an Existing High-speed Railway

Tunneling below an existing high-speed railway belongs to special grade of risk source,and the requirement on stratum settlement in the case is very high. This study was based on a certain project of tunneling below an existing high-speed railway. In this study,the strata's dynamic response to train vibration load during tunneling below the existing high-speed railway was analyzed by means of threedimensional numerical simulation. The numerical simulation result indicated that the intersection point between the tunnel and the existing high-speed railway subgrade was the most critical part in this project,and so relevant strengthening measures should be employed for this part in both the stages of design and construction,for the purpose of ensuring construction safety of the tunnel and ensuring normal operation of the existing high-speed railway.