Multi-row micro-differential roadbed deep hole blasting construction method

Abstract

The invention relates to a multi-row micro-differential roadbed deep hole blasting construction method, which comprises the following steps of: (1) selecting blasting parameters; (2) calculating security; (3) arranging a stair and a free face; (4) distributing holes and drilling holes; and (5) blasting. The blasting method is a multi-row deep hole millisecond micro-differential blasting method; and the blasting is performed by pull trough blasting and side slope blasting in a roadbed sequentially, wherein the pull trough blasting is loose blasting and the side slope blasting is precraking blasting. In the method, a shock conducting tube non-electric priming system micro-differential control blasting technology, a comprehensive blasting construction scheme of loose blasting, the deep hole millisecond micro-differential blasting technology and the roadbed side slope precraking blasting technology, and a wide-pitch and low-resistance hole distribution mode are adopted, so that explosivesand detonators are saved, the drilling mechanization degree is enhanced, the labor cost is reduced, the blasting effect is enhanced, the large rate of blast rocks is reduced, the material abandoning rate is reduced and harms of blasting vibration, impact waves, flying stones and the like are reduced; furthermore, when the blasting effect is enhanced and the stability of the blast roadbed side slope rocks is guaranteed, the absolute safety of blasting can be guaranteed.

Description

technical field [0001] The invention relates to a construction method for deep-hole blasting of a multi-row micro-difference subgrade. technical background [0002] With the continuous development of expressway construction projects in our country to the depth of mountainous areas, the proportion of expressway roadbed stonework in roadbed earthwork is increasing, and the task of roadbed stonework blasting is becoming more and more heavy. Due to the steep terrain, complex topography, and large excavation depth of expressways in mountainous areas, it brings great difficulty to the blasting construction of roadbed stonework. Since the traditional blasting technology cannot accurately control the particle size of the blasted rock, the quality of the roadbed slope, the smooth effect and stability of the roadbed slope, and affects the quality of roadbed backfill, construction cost and progress, it is imperative to study new technologies for roadbed blasting construction. Row. C...

AI Technical Summary

Problems solved by technology

Due to the steep terrain, complex topography and large excavation depth of expressways in mountainous areas, it brings great difficulty to the blasting construction of roadbed stonework

Since the traditional blasting technology cannot accurately control the particle size of the blasted rock, the quality of the roadbed slope, the smooth effect and stability of the roadbed slope, and affects the quality of roadbed backfill, construction cost and progress, it is imperative to study new technologies for roadbed blasting construction. Row

Images