Research On Monitoring Of Surrounding Rock Stability Of Underground Mined-out Area And Ground Pressure Control Method

With the development and utilization of underground resources for survival, it is one of the most important pillars for human society. But with the ongoing activities of underground, it is also facing more and more new problems. Therefore, the monitoring of underground goaf and the processing in underground engineering is a major contemporary facing problem. Through established effective monitoring activities of ground pressure of the underground goaf rock, it has important practical significance for the safety of underground engineering.In this paper, it is based on the scientific research project named"The Goaf Ground Pressure Effects Monitoring and Control Method" for China Gold Group Corporation. Based on the ore production conditions and the actual situation of gold mining company in Liaoning Jinfeng, measuring points are located in the main transport roadways in role of ground pressure, in wearing veins roadways, in inclined roadways, on engineering intersections, in gob internal space and along the edge of goaf. The monitoring of support pressure, crack expansion and settlement goaf roof rock deformation is.using vibrating reaction force meter, taking into account the frequency readout crack for monitoring, and self-developed gob roof subsidence observation instruments The vibrating-wire force gauge, crack and frequency readout instrument monitoring method, and developed the gob roof settlement observation instrument, the support pressure, crack expansion and the goaf roof surrounding rock deformation monitoring. What we analyze is based on the monitoring of downhole ground pressure concentrated area roadway reaction force, rock fracture deformation, gob roof subsidence, at the same time, it is done that the calculation and construction design of gob roof steel frame structures.Monitoring results show that the method used to monitor mining activities and instruments can reflect on the impact of generated effects of engineering ground pressure. With the influence of high ground pressure of current production concentrated area, the ground pressure of both sides of the main transport lane in180 level,150 level and 240 level is going up, which is the formation of local stress concentration area of mining deformed, however, the overall stability of roadway has not effected.The monitoring of stope roof subsidence for empty area in different middle levels shows that the largest settlement came from the 335 stope and the pillar has plitted seriously, there is a danger of rock caving, however, other monitoring subsidence is safe, roof is relatively stable. It has provided valuable feedback for ore production and security.Based on the monitoring results of support reaction force, cracks and roof subsidence, considering gob roadway adjacent ground pressure cause the transfer on the formation of concentrated, and partial crushing ore rock characteristics, the mining activities of mining ground pressure are caused by deformation properties and loosely ground pressure.