The Method of Excavation, Excavation, Support and Brush Expansion in Fully Mechanized Caving Working Face with High Stress Water Rich Roof

Abstract

The invention discloses a high-stress water-rich roof fully mechanized caving face open-off cut, advancing and supporting and brushing expansion method. The high-stress water-rich roof fully mechanized caving face open-off cut, advancing and supporting and brushing expansion method includes the following steps that first, open-off cut, advancing and supporting are conducted, on the basis of penetrating an open-off cut and completing supporting, then an anchor cable beam is installed to strengthen supporting simultaneously, a mechanized caving face frame rear scraper conveyor is arranged on the rear part of the anchor cable beam in a closing mode, and installation and arrangement are conducted simultaneously; second, open-off cut, brushing expansion and pre-supporting are conducted; and third, brushing expansion and assembling high resistance fully mechanized caving support parallel operation are conducted. According to the method, advancing and supporting are coordinated with support installation parallel cooperation and connected to technology, the problems that the installation of a fully mechanized caving hydraulic support is slow, the length of a hydraulic support trailing head is long, the span of a lane is large, and construction hidden risks exist are effectively solved, the safety of open-off cut and brush expansion in high stress area can be actually improved, and the purpose of lane advancing in a safe and quick mode is achieved.

Description

technical field [0001] The invention relates to the technical field of coal mining. Background technique [0002] During coal mining, it is necessary to prepare the roadway in advance for the working face in the mining area, including developing a return airway (track roadway), an air inlet roadway (belt roadway) and a cutout; the cutout is the roadway connecting the inlet and return airway, All the equipment (mainly the shearer and support) of the coal mining face are arranged in this space, and the general cutting eye width is designed to be about 5m. In mining areas where the depth of the coal mine is relatively deep, when the comprehensive top-coal caving mining method is adopted, due to the high ground stress, large rock burst, and strong water-rich roof sandstone, it is necessary to use a high-resistance comprehensive top-coal caving support (referred to as high resistance) fully-mechanized caving support); due to the large size of the support, it is necessary to expa...

AI Technical Summary

Problems solved by technology

In mining areas where the depth of the coal mine is relatively deep, when the comprehensive top-coal caving mining method is adopted, due to the high ground stress, large rock burst, and strong water-rich roof sandstone, it is necessary to use a high-resistance comprehensive top-coal caving support (referred to as high resistance) fully-mechanized caving support); due to the large size of the support, it is necessary to expand the original incision brush to a net width of more than 10m when installing the support; this kind of large-span incision brush expansion has the following problems: due to the original ground stress and structural stress of the roadway Due to the influence of the superimposed stress field, and the overlying rock layer on the roof is a top-coal composite roof with strong water richness, it is difficult to maintain the roof. In addition, it usually takes several months to install the brackets, and the roof is exposed for a long time, which is easy to cause roadway deformation (bottom Drums, ribs, roof sinking, etc.), there is a serious risk of roof fall

At present, there are few domestic researches on the technology of high-stress top-coal cutting hole brush expansion, and no relatively perfect method has been found to solve the above problems.

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