大伙房水库输水隧洞施工中TBM作业方案的论证与实践

大伙房水库输水隧洞工程的施工,曾推荐采用以4台TBM为主、钻爆法为辅的联合施工方案。鉴于原TBM1施工段工程、水文地质条件极为复杂,如果采用TBM施工,将遭受地质灾害的风险。经深入论证后,决定减少1台TBM,将采用4台TBM的联合施工方案改为采用3台TBM的联合施工方案。工程建设过程中揭示的地质条件证明,将原施工方案中的TBM1施工段改用钻爆法施工,充分发挥了钻爆法在不良地质条件洞段施工的优越性,规避了昂贵的TBM设备可能面临的施工风险,保证了工程建设的顺利进行。

Demonstration and practice of construction scheme for operation of TBM for excavation of water conveyance tunnel for Dahuofang Reservoir

During the construction of the water conveyance tunnel for Dahuofang Reservoir the original combined construction scheme of the excavation carried out mainly by 4 TBMs and accessorily by the drill and blast method was ever recommended.However,as the geological condition of the excavation section for TBM1 was quite complicated for the construction of the TBM,a modified scheme with 3 TBMs was made after the further demonstration,in which one TBM was cut away and then the construction left by it was taken by the drill and blast method.The actual geological condition exposed during the construction proves that the modified construction scheme has full displaced the advantages of the drill and blast method for the excavation under the poor geological conditions and avoided the possible risks those would be faced by the TBM,and then the construction progress of the project has been successfully guaranteed as well.