Dip laneway digging hole layout mode
A roadway and blasthole technology, which is applied in the field of drilling and blasting, can solve the problems of low blasting efficiency in downhill tunneling and inability to effectively throw away rock blocks after blasting, and achieve the effects of accelerating cycle footage, improving blasting efficiency, and increasing tunneling speed
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[0009] The embodiment is a downhill roadway with an inclination W=23°. The layout of excavation blastholes is shown in Figure 1- image 3 shown. It can be seen from Figure 1 that it has a total of 49 blastholes, of which No. 1-3 are auxiliary straight holes for cutting, and the eye depth h=0.8-1.0 meters; No. 4-7 and No. 8-11 are divided into left and right holes. Two rows of wedge-shaped cutting holes are arranged in the middle and upper part of the roadway section, and the distance between the two rows is a=1.0-1.2 meters; No. 12-19 are auxiliary throwing holes, and the drilling direction and the cross-section are at an angle of γ=85° to obliquely upward Drilling; Nos. 20-32 are peripheral holes, which are evenly arranged on the two sides and the top contour of the section; No. 33-39 are bottom holes, which are evenly distributed on the bottom contour of the section; the rest of the unnumbered blastholes are auxiliary holes , evenly arranged in the space between the cut hol...
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