该文以宛坪(南阳-西坪)高速公路丁家湾隧道为例,针对双向六车道隧道大断面塌方,提出了用注浆小导管取代超前支护锚杆和系统锚杆加固塌方段,并结合利用离散元方法和现场监控量测,结果表明二者计算结果吻合较好,且满足规范要求,不仅可供类似工程塌方处理参考,也尝试了一种新的隧道开挖分析方法。 Taking Dingjiawan tunnel of Wanping (Nanyang-Xiping) Expressway as an example, aiming at the large-section landslide of bidirectional six-lane tunnel, a new grouting small duct is proposed to replace the advance support anchor and the system anchor to reinforce the collapse section. Combined with the discrete element method and on-site monitoring measurement, the results show that the calculated results agree well with each other, and meet the requirements of the specification, not only for similar project landslide reference, but also to try a new tunnel excavation method.