Full-mechanized excavation face superhard rock positive fault blasting method

Abstract

The invention discloses a fully-mechanized excavation face superhard rock positive fault blasting method which comprises the following steps: S1, according to a result of numerical simulation calculation, intercepting effective stress nephograms of a numerical model at different moments for contrastive analysis; s2, constructing a coal rock model to carry out a blasting similar simulation experiment; s3, calculating a tectonic zone control range according to the normal fault fall; s4, energy-gathered blasting holes and control holes are formed in the fault working face according to blasting specifications; s5, the energy gathering direction of energy gathering blasting is arranged; s6, the blasting holes are filled with energy-gathered cartridges, and directional blasting is achieved; s7, forward charging is adopted as the charging mode; and S8, blasting and weakening the hard rock to finish tunneling of the roadheader. According to the method, the super-hard rock normal fault can be safely and rapidly blasted, the hard rock is fractured in a preferable shaped charge blasting mode in a normal fault structure area, the rock body weakening and roadway supporting effects are good, the problem that dynamic disasters such as surrounding rock instability are induced by common blasting disturbance is effectively solved, and roadway tunneling is safely and efficiently carried out.

Description

technical field [0001] The invention belongs to the field of underground roadway excavation in coal mines, and particularly relates to a blasting method for normal faults of super-hard rock in fully mechanized excavation working face. Background technique [0002] With the improvement of the level of mechanization of coal mining, more efficient tunnel excavation technology is required to match it. The application of the fully mechanized excavator has greatly improved the construction efficiency and construction quality of the roadway in the soft rock geological environment. However, if the working face encounters a hard rock fault, the machine is still used for excavation, which will greatly increase the difficulty of excavation, reduce the service life of the roadheader's picks, and increase the amount of dust generated during the excavation process. [0003] At present, problems such as faults in excessively hard rock in the excavation face are often solved by blasting in...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a normal fault blasting method for super hard rock in the fully mechanized excavation working face, which solves the problem of using ordinary blasting normal fault hard rock in the prior art, and then using a fully mechanized excavator to cut the rock. It is easy to cause the explosion cracks to expand disorderly, which will disturb the coal seam in the structural area and induce the problem of coal and gas outburst disasters.

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