城市地铁下穿高铁路基沉降预测及安全控制

城市地铁下穿高铁路基是一个复杂且系统的工程,其下穿施工对高铁路基沉降的影响往往是该类工程的关键点,需要确保下穿地铁的安全施工与上行列车的正常运营。本文利用GM(1,1)算法的优点,用于发现高铁路基已有沉降数据之间的规律,进而预测高铁路基后续沉降。同时,提出了地铁下穿高铁路基施工的安全控制等级,用于指导地铁下穿高铁路基的施工过程。以广州地铁9号线下穿武广高铁为例,利用已有的路基沉降数据预测后续施工导致的路基沉降值,评价地铁下穿高铁路基的风险等级,判断施工风险等级是否满足要求,进而优化后续地铁施工参数。研究结果表明:高铁路基沉降预测数据的风险等级超过了现场要求的控制等级,提前优化了地铁下穿施工的掘进参数,进而实现了后续地铁下穿施工的风险控制。

Prediction of the High-speed Railway Subgrade Settlement Induced by the Tunnel Construction and Its Safety Control

It’s a complicated and systematic project of the metro construction passing through the high-speed railway, and the influence on the settlement of high-speed railway subgrade caused by metro construction often becomes a key point, so it’s necessary to ensure the safe construction of metro and the normal operation of high-speed train. In this paper, the advantage of GM (1, 1) algorithm is used to find the rule between the existing settlement data of high-speed railway subgrade, and then to predict the subsequent settlement. Meanwhile, the safety control level of metro construction is proposed, which can be used to guide the construction process of metro. Taking Guangzhou Metro Line 9 as an example, the existing subgrade settlement data are used to predict the subgrade settlement data caused by subsequent construction. The predicted settlement data further evaluate the risk level of shield tunneling through high-speed railway, and judge whether the construction risk level meets the requirements, so the subsequent subway construction parameters can be optimized. The results show that the risk level of the predicted settlement data exceeds the control standard required by the site, and it is necessary to optimize the construction parameters in advance, so as to realize the risk control of subsequent metro underpass construction.