Roadway excavation method for underground layered fractured rock mass of metal deposit

Abstract

The invention belongs to the technical field of mining engineering, and particularly relates to a roadway excavation method for an underground layered fractured rock mass of a metal deposit. The roadway excavation method comprises the steps that firstly, a borehole camera device is used for collecting image information of the hole wall of a measuring hole of an excavation roadway, and the thickness of a surrounding rock fissure layer and the surrounding rock intact layer of the roadway is determined according to the image information of the hole wall; based on the principle that the section shape of the roadway after roof falling tends to be a stable shape, it is concluded that the stable shape of the section of the roadway of the fractured rock mass is approximately semi-circular, and thesection of the roadway is determined by using the section shape of a 1 / 3-1 / 2 semicircular arch; and anchor rod supports of the two sides and the arch crown adopt the same supporting density, a smoothblasting method is used for roadway excavation, and anchor rods, anchor nets or anchor net grouting supports are used in the excavation process. According to the roadway excavation method for the underground layered fractured rock mass of the metal deposit, According to the deformation and failure characteristics of the layered fractured rock mass, the section shape and the anchor rod support method of the roadway excavation are provided according to the deformation and failure characteristics of the layered fractured rock mass, the roadway stability can be significantly improved, the safe production conditions are improved, and the technical support is provide for the safe mining of such difficult mining deposit.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, in particular to a roadway excavation method for underground layered fissure rock masses of metal ore deposits. Background technique [0002] In the underground mining of metal ore deposits, many mines have fractured layered rock mass, referred to as layered fractured rock mass. During the process of tunneling the roadway in the rock mass, when the roadway has just been dug, the surface is generally stable, but when the roadway is just excavated, the surface is generally stable. After a certain length or after a period of time, large-scale sudden roof caving or slabs often occur in the roadway, which seriously endangers production safety. [0003] The commonly used solution at present is to use bolts to support the excavation roadway. However, the roadway with high mining pressure still often collapses. When the collapse is serious, the support bolts will be pulled out until the roadw...

AI Technical Summary

Problems solved by technology

Some mines use long bolts or long anchor cables for support. Although they can ensure the safety of the roadway, it leads to high cost of the roadway and great economic pressure on the mine.

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