West Sixth Ring Road highway engineering A blasting scheme
Lot 1 # of xx Road is one of the control works of xx Road. This bid section is located in the south of the intersection of xx Road and National Highway 108, at the junction of the two districts to the north of Gouxi Village, Fengtai District and the south of xx Village, Mentougou District. This section corresponds to the section K17+762~K18+300 of the main line of the Sixth Ring Road, with a total length of 538m. This bid section contains a short highway tunnel (xx tunnel) with a small clear distance (left tunnel is 420 meters long, right tunnel is 440 meters long). This tunnel is a construction period control project, which is constructed at both ends of the tunnel simultaneously. The blasting excavation period is about 10 months. The geomorphic unit of the tunnel construction area is the low mountain and hilly area formed by tectonic denudation, and the surface vegetation is developed. The top elevation of the hill where the tunnel crosses along the NNE direction is 162.45m, the relative elevation difference is about 80m, the slope gradient on the south side is 25 °~30 °, and the slope gradient on the north side is 30 °~40 °. The thickest roof of the tunnel at K18+030 is only 47m, gradually thinning towards both sides, and the mountain shape is incomplete.
