SU1682568A1 - Method for working thick steep and inclined fire hazardous coal seams - Google Patents

Abstract

This invention relates to the underground mining of flammable coal angles. The goal is to improve work safety by improving the quality of training the lower side of the interfloor pillar by roofing rocks as a result of directional and controlled destruction, as well as reducing the loss of coal in the interfloor area. Preparatory and rifled excavations are carried out. Excavation in the floor is carried out by descending horizontal slots Vis of which the sides of the layer under the collapsed rocks of the roof. Explosive wells are drilled in the top of the seam. In the process of clearing the notches form the interfloor barrier coal pillar. The lower side of the interection pillar is formed at an angle of repose of the collapsed rocks of the roof by dredging the elongating layers as the formation downturns. In the process of capturing each layer under the interfloor, the destruction of the roof of the reservoir by the blasting of wells is entirely carried out. When working the layers under the entire floor to the recumbent side of the formation, the interfloor pillar is hardened by installing anchors in its lower side. The lower part of the floor is worked out under the entire floor, podbuchennym collapsed causes of the roof of the reservoir. 3 il.

Description

The invention relates to the mining industry and can be used in the development of powerful steep and inclined fire-hazardous coal seams.

The purpose of the invention is to increase the safety of work by improving the quality of training the bottom side of the interfloor pillar by roofing rocks as a result of directional and controlled destruction, as well as reducing the loss of coal in the inter-outlet pillar.

FIG. 1 shows a diagram of the preparation of a thick coal seam; FIG. 2 illustrates the procedure for excavating horizontal layers; on fig.Z - scheme podbuvani barrier pillar by compulsory collapse of rocks

The method is carried out as follows.

From the field chute 1, shot down with a field drift 2, subsurface logs 3 are carried out to the recumbent side of the reservoir. At the reclining side, subsurface drifts 4 are conducted. Under- floor drift 4, the contour 5 floor contour is contoured

slope ort 6 to the hanging side of the seam, in which the drift 7, which also contour the barrier sight 5, is contoured. The angle at which the slope ort b is conducted is chosen so that roof rocks 9 forcibly collapsed using borehole charges 8 the open slope was filled with space.

The cleansing works are carried out by descending layers from the hanging side of the reservoir under the collapsed rocks. The first two or three horizontal layers are removed by drilling and blasting in short lavas. In the future, when the length of the lava is 10 m or more, a mechanized complex 10 of the type KM-130 or KNK is mounted. Three wells are drilled into the roof of the first horizontal layer every 5–10 m by fan in such a way that they do not go beyond the contour of the natural collapse of rocks, i.e. 45 ° to the dip line. Forced collapse of roof rocks is carried out by blasting explosive charges in wells when each layer is excavated below the entire floor. When developing horizontal layers up to the recumbent side of the formation, the barrier pillar is formed at an angle of natural repose of the collapsed rocks by dredging layers of different lengths and hardening the lower side of the barrier casing 5 in each layer with anchor bolt 11. After the length of the lava reaches a maximum value those. drifts are located in the lower and lower sides of the reservoir; the cleaning technologist includes only the processes of roof collapse. Collapsed rocks of the roof are placed in the worked-out space, which makes it possible to avoid working on the pillar and the spontaneous combustion of coal due to the bypass of fires from the overlying floors.

Claims (1)

Claim Method A method of developing powerful steep and oblique fire-hazardous coal seams, including carrying out preparatory and rifled workings, excavating the floor with descending layers from the hanging side of the reservoir under the collapsed rocks of the roof of the reservoir, drilling the roof of the reservoir by blasting the wells, the formation of an interfloor coal barrier pillar and the hardening of the barrier pillar, characterized in that, in order to increase the safety of work by improving the quality of podbuchivaniya lower The ort of the interfloor pillar by the roof rocks as a result of their directed and controlled destruction, as well as the reduction of coal losses in the interfloor pillar, the excavation of the descending layers is carried out horizontally; seam excavation, and the destruction of the roof of the reservoir by blasting wells is carried out in the process of excavation of each layer under the entire interfloor, and the strengthening of the interfloor pillars produced by installing an ers in its lower side when working on the layers below the entire floor to the recumbent side of the formation. J , KWrVw GL IL1 «YIWI ™ vvovOv in and« MMIMOTIViMNHYAV 3 eight Fig.Z Rig.2