English：

It is difficult to balance the excavation efficiency and good contour formation in theconstruction of a small section tunnel. Based on the background of parallel pilot tunnel project, theresearch on efficient drilling and blasting technology and surrounding control technology of small sectiontunnel excavation is carried out. Firstly, the difficult problems of drilling and blasting construction of asmall section tunnel were analyzed. Secondly, to improve the excavation efficiency, the drilling andblasting construction technology based on drilling jumbo was studied. The charging plugging structure ofcutting hole, auxiliary hole, and surrounding hole was optimized, and the safety distance of blastingvibration was determined. Then, aiming at the problem of overbreak and underbreak, a deep and shallowcomposite optical blasting hole technology was proposed. The optical blasting deep hole was used to formthe excavation contour, and the optical blasting shallow hole was used to eliminate the underbreak. TheANSYS / LS⁃DYNA simulation software was used to analyze the deep and shallow composite opticalblasting hole, and the reliability of the deep and shallow composite optical blasting hole technology wasverified. Finally, the field test was carried out in the physical project. The excavation section wasflattening and smooth, forming a good blasting profile, and the utilization rate of the blast holereached 93. 3%.