Back break control method for tunnel

Abstract

The invention provides a back break control method for a tunnel. The method comprises the following steps: first, further optimizing original blasting parameters according to a surrounding rock condition determined by advance geology forecast and construction site investigation; then letting out a hole distributing position accurately according to the optimized blasting parameters; and finally, drilling, cleaning the hole, and charging an explosive, and connecting a detonating network to blast. The blasting parameters of an excavated smooth face of a conventional stone tunnel is optimized according to the type of the surrounding rock determined jointly by advance geology forecast combined with construction site investigation around by finely adjusting the drilling parameter and the charging structure by means of existing common materials such as a fire work material and a water bag, so that the blasting quality of full face excavation of the tunnel is improved, a back break phenomenonin conventional full face blasting of the tunnel is reduced to the maximum extent, and targets that the blasting effect is good, the quality safety is guaranteed, the construction cost is controlled effectively and the steps are circular and convenient in sandy slate tunnel excavation penetrating a belt of folded strata are achieved.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a method for controlling over- and under-excavation of tunnels. Background technique [0002] For silty slate geological tunnels, over- and under-break control during construction, especially the quality control of over-break, is the biggest factor affecting the quality and safety of tunnel construction, construction progress, and construction cost. This requires us to reasonably select the excavation method and blasting parameters during the tunnel construction process, scientifically and accurately judge the changes in the surrounding rock and adjust the relevant parameters in a timely manner, so as to achieve the smooth blasting effect as the goal, and reduce the over- and under-excavation during the tunnel excavation construction. Adverse effects are reduced to the minimum level, so as to realize the effective control of tunnel construction quality, safety, schedule and cos...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a tunnel overbreak and underbreak control method to solve the disadvantages of underbreak and overbreak that are often encountered during the full-section excavation process of traditional tunnel blasting.

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