高铁的正常运营对下方无砟轨道的沉降要求极为苛刻,这也间接增加了浅埋隧道穿越既有高铁路基的难度.文章以广州某地铁9号线下穿武广高铁为依托,结合国内新兴的MJS工法,对施工过程进行了全程三维数值模拟分析,结果表明MJS预加固可有效控制盾构施工引起的地层沉降；并据此提出了相应的列车限速、加强盾构掘进参数控制、加强信息化施工水平等确保高铁运营安全的应对措施.%The requirements for the normal operation of high-speed railways are harsh on the settlement of ballastless tracks, making it tough to pass under the subgrade of an existing high-speed railway for a shallow metro tunnel. Using the Guangzhou Metro line 9, which passes under the Wuhan-Guangzhou high-speed railway, as an example, a 3-D numerical simulation analysis of the construction process was carried out in combination with the MJS method. The results show that pre-reinforcement by the MJS method can effectively control the stratum settlements caused by shield construction. Such measures as limiting train speeds, controlling parameters, and improving observational construction are put forward in order to ensure the safety of high-speed railway operation.
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