A Boundary Controlled Blasting Method for Reducing Overbreak and Underbreak

Abstract

The invention relates to a boundary control blasting method for reducing over-excavation and under-excavation, which at least includes the following steps: early-stage unmanned aerial vehicle terrain survey, site cleaning and drawing stakeout, blast hole layout, drilling rig operation and blast hole construction, longitudinal blasting operation, Cleaning, grouting hole layout, drilling rig operation and grouting hole construction, grouting, secondary blasting hole excavation charge on slope, secondary blasting hole operation and monitoring, support, and gradually complete high slope blasting excavation support . The superior effect of the present invention is that: a boundary control blasting method for reducing overbreak and underbreak in the present invention can set explosive blasting through the blast hole, can effectively remove most of the rock mass outside the designed excavation line, and set it through the secondary blast hole Explosive blasting can effectively remove a small part of the rock mass outside the designed excavation line. By blasting in batches, the rock mass outside the designed excavation line can be removed successively, which can reduce over-excavation and under-excavation, and save construction costs. High practical value and social value.

Description

technical field [0001] The invention relates to the technical field of slope excavation controlled blasting in geotechnical engineering, in particular to a boundary controlled blasting method for reducing over-excavation and under-excavation. Background technique [0002] China is a mountainous country. In recent years, with the country's increasing investment in infrastructure projects, there have been more and more road and railway construction projects. In the construction of highways and railways in mountainous areas, roads often pass between river valleys and mountains, and the construction of these projects often involves the excavation of high slopes. [0003] In the construction of highways, railways and other projects in mountainous areas, the drilling and blasting method is often used for operations. However, in drilling and blasting construction, over-excavation and under-excavation are relatively difficult to control. Excessive over-excavation will not only inc...

AI Technical Summary

Problems solved by technology

However, in drilling and blasting construction, over-excavation and under-excavation are relatively difficult to control. Excessive over-excavation will not only increase the cost, but more importantly, it will increase the cost of overfilling concrete.

In actual construction, although the construction unit minimizes over- and under-excavation, due to improper technical methods, the project cost is increased during the construction process and the construction period is prolonged.

[0004] At present, high slope blasting technology has been widely used in the construction industry, but it is still an innovative and perfect subject for high slope blasting construction under special conditions

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