pressure mine
2.This text has analyzed the mechanism that relieving-shot control the deformation of roadway country rock, and the sureness of the rational parameter, relieving-shot is practiced in south high-pressure 31022 haulageway in Gedian mine of Shenhuo group, through the deformation data of two sides roadway and the roof-floor after releasing pressure, the effect of releasing pressure is verified, and relieving-shot parameter is rational.
3.THE STUDY ON TNE NINING METHOD AND GROUND PRESSURE PATTERN OF ACTIVITIES IN THE GA KE MINING DEPOSIT OF DOU NAN MANGANESE MINE
5.By means of similar simulation, lateral abutment pressure distribution and concentration degree which at the face of the upper coal, the distance between peak stress and coal surface, the influence circle of abutment pressure, and the transfer and weakening of concentrated pressure at the bottom side are analyzed on actual geology data in Pingdingshan 8th mine F15 and F(subscript 16-17).
6.Products are: super high pressure electric, pneumatic, manual oil pump; pre-stress Jack for the use of coal mine and construction; steel bar and cable scissor; all kinds of bolt for safety supporting and bolting (KM19 and KM22 bolt have all got the certificate of “MA” in China.); cable anchor and bolt test stand; hydraulic nut scissor and etc.
7.This essay introduces the working principle of a new sort of equipment, Model YZI-450 hydraulic pressure rectifier, which can be used to restoring the I-steel beam and post in coal mine, and completes a detailed mechanistic calculation, and draws a ordinary conclusion on restoring the being out of shape hardly.
9.Abstract: In view of the complexity of air leakage form in comprehensive mechanized sublevel caving mining non-pillar compound mining field, a pressure energy testing to ventilation system adjacent to fully-mechanized sublevel caving mining working face is proceeded in Dongtan mine of Yanzhou in Shandong province, source and sink of air leakage are determined primarily, SF6 gas is released by using transient state method, the air speed of air leakage of every point and air leakage quantity in mining field and its distribution state can be determined by test and analysis.
