Underfill Mining Method with Only Serrated Ore Pillars

Abstract

The invention discloses a filling body under mining method with only toothed jambs left. Mining of a one-step chamber stope and mining of a two-step jamb stope are sequentially carried out, cemented filling is adopted in the chamber stope, and non-cemented filling or cemented filling is adopted in the jamb stope. Coal extraction is carried out on the chamber stope below a filling body in one steptill coal extraction is carried out on the bottom face of the filling body, after coal extraction of the stope is finished, mine rock of the adjacent jamb stope is located on the two sides of a dead zone, the filling body is located at the top, and cemented filling is carried out after ore removal is completed; and coal extraction is carried out on the jamb stope below the filling body in two steps, the bottom face of the filling body is not exposed, and mine rock of a certain height is reserved below the filling body and is not subjected to coal extraction. After coal extraction of a stage mine body below the filling body is completed according to the above manner, no complete protolith horizontal jambs are reserved, only the toothed jambs small in mine quantity are formed, the quantity of the protolith horizontal jambs between stages is reduced, the one-time efficient coal extraction rate of resources in a normal exploitation unit is improved, and then economic benefits of exploitation of mine enterprises are increased.

Description

technical field [0001] The invention relates to an underground mine mining technology, in particular to an underground mining method with only tooth-shaped ore pillars left behind a filling body, which is mainly suitable for safe, economical and efficient mining of underground metal and nonmetal mines. Background technique [0002] With the continuous improvement of the awareness of mine safety and environmental protection and the increasing emphasis on the recovery rate of mineral resources, the filling and filling mining method has achieved great development and wide application in recent years. Before underground mine filling and mining, it is necessary to carry out reasonable planning and design of mining scheme, mining and filling sequence, ground pressure control and technical economy according to its mining technical conditions, especially the isolation of filling and mining operations between upper and lower adjacent stages. Transition and connection directly affect ...

AI Technical Summary

Problems solved by technology

[0010] ①After leaving the inter-stage original rock horizontal pillars, when the lower stage one-step mine stope mining is completed and filled, due to the consolidation and settlement characteristics of the filling body, it is difficult for the filling body to achieve rigid contact with the upper original rock horizontal pillars. As a result, after the mining of the two-step pillar stope, the goaf of the pillar stope on both sides of the filling body of the mine house stope is connected through the lower surface of the original rock horizontal pillar, which in turn causes a large gap between the original rock horizontal pillars. The area is overhanging, and the risk of fracture and collapse is high, which threatens the safety of mining in the two-step pillar stope;

[0011] ②After the stope mining in the upper stage is completed, the stress of the original rock is transferred to the surroundings, and the stress of the original rock pillar increases between stages. The stope filling body in the upper and lower stages of the rock pillar is a relatively soft medium, and the movement and deformation caused by the closure of the surrounding rock of the upper and lower walls are mainly applied to the original rock pillar between stages, resulting in a high concentration of stress, which may cause severe ground pressure disasters. The safety risk of triggering ground pressure disaster is high;

[0012] ③The amount of resources left in the original rock horizontal pillars between stages will be recovered as residual ore resources in the later stage, the stress will be high and the degree of damage will be large. When the horizontal pillars of this stage are reached in the later stage to recover residual ore resources, the safety risks of personnel and equipment will be high

[0014] ① In order to rigidly support the closed deformation of the surrounding rock caused by the mining of the upper and lower stages of the stope, the horizontal pillars of the stages need to be set at a sufficient height to effectively control the ground pressure. It is an early investment in the construction of underground mining projects, leaving a large amount of resources occupied by horizontal ore pillars of sufficient height, and the recovery is lagging behind, and the pressure control is serious, which is equivalent to occupying a large amount of investment costs and lagging behind in corporate earnings;

[0015] ② Horizontal ore pillars between stages can only be recovered as residual ore at the end of ore body mining. Due to the deterioration of mining technical conditions in the later stage, there are uncertainties such as recovery technology and recovery safety, the recovery rate is generally very low, and may not be recovered , resulting in a large amount of permanent loss of mineral resources, seriously affecting the investment income of mining enterprises

[0017] ① In order to effectively exert the effect of ground pressure control, it is necessary to reserve a sufficient height of inter-stage raw rock horizontal pillars, resulting in a large amount of pressure ore resources of inter-stage horizontal pillars that cannot be recovered efficiently in normal stopes, thereby reducing the maximum diameter and depth. The ratio of ore volume for high-efficiency mining is equivalent to reducing the mining efficiency of the ore body stope at this stage;

[0018] ② It is difficult to recover the horizontal ore pillars of the original rock in the later stage. Usually, only the residual ore recovery process with low labor productivity can be used. Moreover, the recovery in the later stage is often far away from the large-scale mining section, the mining operation line is elongated, and the personnel and equipment are accessible. , mine transportation and other capabilities are limited, the management of mine safety production is complicated, and mining efficiency is low

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