Anti-scour method for coal roadway tunneling head-on anchor cable support

Abstract

The invention discloses an anti-scour method for coal roadway tunneling head-on anchor cable support. The anti-scour method comprises the following steps that firstly, reasonable head-on reinforced anchor cable construction parameters are determined according to factors such as coal roadway geological conditions and single-day tunneling footage by utilizing an anchor cable support technology in coal mine roadway surrounding rock control; before tunneling is started, the number and construction positions of anchor cables needing to be reinforced are determined according to the roadway section size and working conditions; the first round of reinforcing anchor cables of one group is starting to constructed, the first round of reinforcing anchor cables of the other groups are constructed at the current head-on position after one single-day tunneling footage operation is completed, tunneling operation is continued to operated, the process is repeated at the current head-on position to construct the next group of reinforcing anchor cables after the tunneling operation is completed, and so on; and 2-3 reinforcing anchor cables are always arranged in the head-on coal wall in front of the tunneling working face. According to the method, the head-on impact resistance of the tunneled roadway can be guaranteed only through anchor cable supporting, and meanwhile the tunnelling speed can beguaranteed; and in addition, disturbance to the head-on coal wall is small in the construction process, and construction safety can be guaranteed.

Description

technical field [0001] The invention relates to a scour prevention method for head-on anchor cable support in coal roadway excavation, and belongs to the technical field of coal mine safety mining. Background technique [0002] In recent years, the mining of coal resources has gradually shifted to deep areas, and frequent ground pressure accidents have occurred in the excavation face. Because the excavation face is generally a single-headed roadway, it has the characteristics of narrow working space, cumbersome operating procedures, and a large number of workers. Once the coal body impacts head-on, the escape channel of personnel is easily blocked by the rushed out coal body, which poses a serious threat to the safety of equipment and personnel in the excavation face. Effective prevention and control of head-on coal impact disasters in coal roadway tunneling face is of great significance to ensure rapid tunneling and safe mining of coal resources in deep mines. At present, ...

AI Technical Summary

Problems solved by technology

At present, the prevention and control method of head-on coal body impact in coal roadway excavation working face is relatively simple, mainly relying on large-diameter drilling of the front-face coal wall for pressure relief

Due to the small cross-section of the roadway in the excavation face, every time a large-diameter borehole is constructed, the fully-mechanized excavation equipment needs to be withdrawn from the front coal wall for a certain distance to ensure that the drilling rig equipment has enough work space to complete the large-diameter borehole unloading. After pressing, move the fully mechanized excavation equipment close to the head again for the next stage of excavation, such alternate construction has a great influence on the speed of tunnel excavation

In addition, when large-diameter boreholes are constructed head-on in areas with strong impact hazards, the pressure relief operation itself will also disturb the stability of the surrounding rock in a critical impact state, which may induce head-on coal mass impact at the excavation face

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