Gob-side entry retaining dynamic pressure area active supporting method and roof separation nondestructive monitoring device

Abstract

The invention discloses a gob-side entry retaining dynamic pressure area reinforced active support method and a roof separation lossless monitoring device for monitoring the support effect, which are characterized in that super-large-diameter anchor cables are added in advance on an advanced support section 20m away from a gob-side entry retaining in front of a working surface to be matched with the positions of anchor cables in the original support, so that an active superposition support structure is formed; the gob-side entry retaining method not only can ensure that the roadway roof of the forepoling area is not collapsed and the operation area is safe, but also can save the labor intensity of workers in the forepoling area, improve the roadway utilization space and ensure the efficient and safe stoping of the intelligent stoping working face. According to the nondestructive monitoring device and method for the roadway roof separation, the nondestructive monitoring method is adopted, a stress wave monitoring receiver is tightly attached to roof rock, an impact rod impacts a roof, stress waves are generated on the roof, and the distance of the roof separation is calculated according to the time difference of the stress waves received twice and the wave velocity of the stress waves. The device can be repeatedly used, and drilling on the top plate is not needed.

Description

technical field [0001] The invention belongs to the field of roadway support in coal mines, and in particular relates to a support structure and a support method for strengthening the support of a gob-side entry dynamic pressure zone, as well as a roof separation non-destructive intelligent monitoring device for monitoring the effect of strengthening the active support, and method. Background technique [0002] Gob-side entry retention refers to the maintenance of the original mining roadway along the edge of the gob after the coal mining face. In order to recover the security coal pillars left in traditional mining methods. Adopt certain technical means to re-support the roadway in the previous section and leave it for the next section. Generally, the method of perforating and blasting the roof along the tangential line is used to make the roof collapse and form another group of the roadway. The use of gob-side entry retaining can reduce the amount of roadway excavation, ...

AI Technical Summary

Problems solved by technology

[0007] In the conventional working face, there are cases and documents of using active support of anchor cables instead of shed-type supports, but there are no cases for the particularity of the advance support section of gob-side entry retaining

There is no relevant achievement on the non-destructive monitoring device for roof abscission to monitor the dynamic pressure zone of gob-side entry retaining to strengthen the active support effect

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