Grid drill site actual measurement method of shallow-buried single-key-stratum stope overlying stratum structure

Abstract

The invention discloses a grid drill site actual measurement method of a shallow-buried single-key-stratum stope overlying stratum structure, and belongs to the technical field of coal mining. The actual measurement method includes the steps that a plurality of fixed measurement stations are set in an auxiliary conveying way; drill holes in an air return way are divided into displacement inclinedholes An, displacement vertical holes Bn and peep inclined holes Cn, wherein the displacement vertical holes Bn and the displacement inclined holes An are located in the same plane, the displacement vertical holes Bn and the displacement inclined holes An are crossed to form a grid shape, and the peep inclined holes Cn are parallel to the largest displacement inclined hole; and a roof stratum breaking movement trajectory and a displacement change rule are actually measured through a drill site on the auxiliary conveying way and the air return way. The before-mining and after-mining whole process of a working face can be monitored in real time through the drill holes in the auxiliary conveying way, and the existing requirement for observation of a roof stratum caving zone and a fissure zoneis met; and obtained roof extended breaking or moving information is monitored through the advanced drill holes of the air return way, and the requirement for an important information source of warning and forecasting of pressure on the working face in the prior art can be met.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a grid-shaped drilling site measurement method for a shallow-buried single key layer stope overlying rock structure. Background technique [0002] In the process of mining underground coal resources, how to control the activity of overlying rock is the primary problem. Only by mastering the structure that may be formed after the rock mass is destroyed and its activity law, can the relationship of "support-surrounding rock" be reasonably used, the safety of the stope be economically controlled, and the safety of personnel and equipment be guaranteed. The structure of the overlying rock in the stope is not an artificial structure. Local observation and drilling are used to peek at the site, and advanced testing methods such as acoustic emission, microseismic, optical fiber, etc. are expected to obtain the morphological characteristics of the overlying rock failure. The laborat...

AI Technical Summary

Problems solved by technology

However, the roof structure of the shallow working face is mainly based on the theoretical model proposed by the actual measurement of the support load, physical simulation and numerical calculation, and there is no systematic research on the roof structure.

Most of the actual measurement of the movement of the roof strata at home and abroad is to observe the vertical drilling on the ground of the working face. The cost of vertical drilling is high and the observation period is long. Grasp the broken space position and strength of the working face, but it is difficult to grasp the real situation of the roof crack and structural movement

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