Blasting excavation construction method for shallow-buried unsymmetrical-pressure large-span multi-arch tunnel without middle pilot tunnel

• Main Authors: ZHU CHANGJIANG, HUANG GUOLIN, ZHANG XUEMIN, ZHAO RUILONG, YANG CHUANFENG, CHEN CHANGJIANG, LI YUFENG, CHEN JUNWU, WANG MINGJIANG, XU ZUHONG
• Format: Patent
• Language: Chinese; English
• Published: 22.08.2023
• Subjects: AMMUNITION; BLASTING; EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; HEATING; LARGE UNDERGROUND CHAMBERS; LIGHTING; MECHANICAL ENGINEERING; MINING; SHAFTS; TUNNELS; WEAPONS

The embodiment of the invention provides a blasting excavation construction method for a shallow-buried unsymmetrical-pressure large-span multi-arch tunnel without a middle pilot tunnel, and relates to the field of tunnel construction. The blasting excavation construction method for the shallow-buried unsymmetrical-pressure large-span middle-pilot-tunnel-free multi-arch tunnel comprises the steps that a shock insulation layer is arranged between a secondary lining and a primary support of a preceding hole to improve the shock absorption capacity of the preceding hole; a plurality of blasting shot holes are formed in the posterior hole, and the blasting shot holes are detonated to conduct blasting construction on the posterior hole for multiple times; setting a plurality of monitoring points in the posterior hole, obtaining monitoring data of the plurality of monitoring points, and obtaining a vibration change curve of the posterior hole according to all the monitoring data; and according to the vibration chan