Rapid expanding excavation conversion method for reserved core soil of CRD normal annular pilot tunnel

• Main Authors: CHEN SHUNYUN, YANG CHENXIANG, MENG XIAOWEI, ZOU YI, LI HUI, CHEN XIN, LIN JIANPING, LIU HONG, YANG XUEBIN, LIU BO, LU HANYIN, FANG HONGBO, LI GUANGHUI, FU RUNHANG, SUN QINGJIE
• Format: Patent
• Language: Chinese; English
• Published: 11.06.2024
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

The invention relates to a CRD normal annular pilot tunnel reserved core soil rapid expanding excavation conversion method, which belongs to the technical field of tunnel engineering, and is characterized in that in underground excavation tunnel construction which is good in surrounding rock and needs expanding excavation and construction method conversion, measures such as advance support, feet-lock bolts, temporary spraying and mixing, middle vertical support and the like are combined; a first left pilot tunnel, a second left pilot tunnel, a first right pilot tunnel and a second right pilot tunnel are formed through gradient expanding excavation of the upper left pilot tunnel and the upper right pilot tunnel through the CRD method, core soil is reserved, a temporary middle vertical support is additionally arranged, and conversion of the CRD normal annular pilot tunnel reserved core geotechnical method is completed. According to the method, on the premise of ensuring uninterrupted tunnel excavation construct