A tunneling method for weakening strength of hard rock mass

Abstract

The invention discloses a tunneling method capable of weakening hard rock strength. According to the method, a tunneling machine, an integrated grinding jetting drilling machine with the tunneling machine as a carrier, and a high-pressure water pump are arranged on a tunneling working surface; the integrated grinding jetting drilling machine is adopted to form drilled holes in a rock body, and a series of conical crack clusters are formed through cracking cutting on the basis of hole drilling; a high-pressure hole sealing device is used for sealing the tunneling surface for a distance, the high-pressure hole sealing device is communicated with a high-pressure water pump through a water inlet pipe, the characteristic that the rock body is resistant to pressure but not resistant to drawing is utilized, the conical crack clusters in the rock body are expanded to form a dense conical crack net, and therefore the rock strength is weakened; a tunneling machine cutting head is adopted to cutthe rock which has an internal conical crack net, the tunneling efficiency is greatly improved, the service life of the tunneling machine can be prolonged, and the tunneling cost is reduced.

Description

technical field [0001] The invention relates to a tunneling method for weakening the strength of a hard rock mass, which is suitable for tunneling construction of a roadway or a tunnel rock mass with a relatively high Platts hardness coefficient. Background technique [0002] At present, coal mining has gradually developed to deep and complex strata, which puts forward higher requirements and new challenges for the safe and efficient mining technology and equipment of deep and complex coal resources. Due to the increase of in-situ stress, the elastic modulus, hardness and failure strength of coal rocks in deep and complex strata usually increase accordingly, and the uniaxial compressive strength often reaches above 150MPa. Although the blasting excavation method has the characteristics of flexibility, convenience, low cost, strong adaptability, and unaffected by changes in geological conditions, it has disadvantages such as many procedures, low safety, and low excavation eff...

AI Technical Summary

Problems solved by technology

Although the blasting excavation method has the characteristics of flexibility, convenience, low cost, strong adaptability, and unaffected by changes in geological conditions, it has disadvantages such as many procedures, low safety, and low excavation efficiency.

When mechanically cutting and breaking rocks, the tool wears seriously and consumes a lot. It is mainly used for cutting and breaking coal rocks with a Platinum hardness coefficient f≤8; mechanical impact can break most coal rocks, but it works in hard coal rocks (f>15) There are problems such as serious wear and shedding of ball teeth, low rock breaking efficiency and large amount of dust, which greatly reduce the mechanical impact rock breaking ability, efficiency, service life and reliability of equipment. How to achieve safe and efficient crushing of hard coal rock has become a deep, Key issues and difficulties in the efficient development of coal and other ore body resources in complex strata

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