黄土隧道开挖方法及沉降处理措施

宝兰客运专线甘肃段黄土隧道工程,具有断面大、围岩强度较低、沉降量大等特点。选择合适的开挖方法,是确保隧道安全和快速施工的关键。黄土隧道洞口容易坍塌,洞内在高含水量地段沉降大,由于适当加大预留沉降量,并采取有效的防沉降措施,保证了黄土隧道的施工安全和工程进度,顺利完成施工任务。

Excavation Method and Settlement Control Measures of Loess Tunnel

The loess tunnel engineering in Gansu Section of Baoji-Lanzhou High-speed Railwayis characterized by large section, low strength of surrounding rock, large settlement, etc., so selecting the proper excavation method is the key for tunnel safety and rapid construction. The loess tunnel portal is easily collapsed; the high water content section in the tunnel may be lowered to a great extent, so the reserved settlement shall be increased properly, and effective settlement control measures shall be taken to ensure the construction safe and smooth progress of loess tunnel and smooth completion of construction tasks.