大跨隧道粉质黏土富含砂粒段施工

根据工程的地质情况，综合安全、质量、进度、成本各方面因素考虑，采用了三台阶预留核心土法联合临时仰拱、扇形支撑进行开挖支护，对其施工技术要点作了叙述，通过施工效果评价，表明该施工方法是科学合理、安全有效的。

On the large-span tunnel construction of the silt clay with sand

According to the geographic situation of the construction,the paper integrates the consideration on the safety,the quality,the process and the costs,adopts the three-step core-soil method to excavate and support by combining the temporary inverted arch and the fan support,and also gives an introduction on the construction points.According to the effect evaluation, it is proved that the construction method is scientific,reasonable,safe and efficient.