Coal roadway roof reinforcing and upper protecting anchor rod supporting method based on top plate stability

Abstract

A coal roadway roof reinforcing and upper protecting anchor rod supporting method based on top plate stability is suitable for the field of roadway supporting. A roadway top plate is divided into different areas, rock core information of each area is analyzed, and therefore the rock integrity of each area of the top plate is obtained; the testing result of each area is analyzed, the mass index ofrock in each area of the top plate is judged, when the rock mass index is larger than a preset value, a plurality of anchor rods or anchor ropes are evenly and perpendicularly distributed in the areaof the top plate to conduct simplex reinforcing supporting, and a plurality of anchor rods are evenly and perpendicularly distributed within corresponding ranges of coal uppers on the two sides. The anchor rod supporting array pitch is greatly increased, supporting time is saved, and the advance rate is remarkably increased; due to the increase of strength and length of the anchor rods of the topplate and the increase of the pretightening force of the anchor rods, an anchoring rock beam of a sufficient thickness is formed by the top plate, and therefore the overall roadway stability is improved; meanwhile, the peak pressure positions of the uppers are transferred to be close to the coal wall side, and the deformation of the coal uppers can be controlled through the low-strength short anchor rods.

Description

technical field [0001] The invention relates to a coal roadway support technology, in particular to a coal roadway strong roof side bolt support method based on roof stability. technical background [0002] After more than 40 years of rapid development of coal mines in my country, coal mining technology has basically realized modernization and mechanization, while only coal breaking, coal loading and coal transportation have been mechanized in the excavation process, and the support process still relies on crowd tactics. With the rapid advancement of high-yield and high-efficiency fully mechanized mining faces, a large number of roadways need to be excavated underground. According to incomplete statistics, the total length of new roadways excavated by state-owned large and medium-sized coal mines is as high as 8000km every year, and more than 80% of them are roadways excavated in coal seams Therefore, the speed of coal roadway excavation directly affects the succession of mi...

AI Technical Summary

Problems solved by technology

[0003] In recent years, with the extensive application of roadheaders, continuous miners, bolters and other mechanical equipment in roadway excavation construction, the mechanization level of roadway excavation has been improved to a certain extent, but it is far from meeting the requirements of the site, because the support of the roadway The maintenance speed cannot keep up with the excavation speed, and the bolt support time accounts for a large proportion of the total excavation time

[0004] At present, most of the coal roadway support adopts the combined support of bolts and cables. Although it can meet the needs of the engineering site to a certain extent, the support density is too large, the support process is complicated, and the active support strength is small, which makes the deformation of the roadway relatively large. large, which obviously restricts the speed of excavation, and accidents of roof crossing occur from time to time

Images