A method for smooth surface forming of preset edge holes in weakly bonded and multi-fissure water-rich rock roadway

Abstract

The invention relates to a weakly-caked multi-fissure water-rich rock roadway preset marginal smooth-surfacing technique, comprising the steps of making marginal hole drilling positional marks sequentially at a tunneling roadway face according to the standards of a linear distance of adjacent marginal holes being 0.5-0.7 m, and a vertical distance between each marginal hole and roadway design outline; using a drill rig to perform drilling at the marks from left to right and from bottom to top in the sequence: left side marginal holes, right side marginal holes, left arch shoulder marginal holes, right arch shoulder marginal holes and arch top marginal holes, wherein each hole is 0.2 m in diameter, 1.2 m in depth and 10 degrees in external tying angle; using an integrated tunneling machineto perform rock breaking sequentially from left to right; cleaning gangue and sundries on the face; using shot concrete to perform primary supporting, and enabling the roadway to be in regular sectionshape. The weakly-caked multi-fissure water-rich rock roadway preset marginal smooth-surfacing technique is simple and low in cost, and enables forming condition of a weakly-caked multi-fissure water-rich rock roadway to be effectively improved.

Description

technical field [0001] The invention relates to the section forming technology of a roadway, in particular to a method for forming a smooth surface with preset edge holes in a weakly bonded and multi-fissure water-rich rock roadway. Background technique [0002] The roof and floor of Jurassic coal seams in western my country are characterized by late diagenesis, poor cementation, low strength and rich water, and belong to weak and unstable rock formations. Therefore, many roadways in coal mines in the western region are located in this kind of weakly bonded, multi-fissure water-rich sandstone layer. The surrounding rocks form mud when they meet water and sand when they meet wind, and their tensile strength is very low. When using fully mechanized excavator to excavate, when the picks press and break the rock on the working face of the roadway, it is very easy to cause the surrounding rock in most areas around the design outline of the roadway to be cut and dropped, resulting...

AI Technical Summary

Problems solved by technology

When using fully mechanized excavator to excavate, when the picks press and break the rock on the working face of the roadway, it is very easy to cause the surrounding rock in most areas around the design outline of the roadway to be cut and dropped, resulting in roof fall and slabs, and finally leading to the formation of the roadway section. very poor

At the same time, it brings great safety hazards, which brings great difficulty to the later support, and the quality of support is difficult to be guaranteed.

[0003] In addition, due to the strict control over raw materials of explosive detonators required in the construction process of the drilling and blasting method, most of the construction of new coal mine roadways in the western region is carried out by fully mechanized excavator excavation. Squeeze and cut the surrounding rock of the working face to break the rock. Due to the poor lithology of the surrounding rock, the above-mentioned practical engineering problems need to be solved urgently.

Images