Method for waste rock cementing filling after up-caving open stoping

Abstract

The invention belongs to the technical field of underground mine exploitation, and particularly relates to a method for waste rock cementing filling after up-caving open stoping. The method is used for solving the problems of the poor mixing effect of waste rock and cementing filling slurry during conventional waste rock cementing filling, non-standard filling body strength and stability, breakingof two-step pillar regularity during waste rock filling and the like. The method comprises the following steps that firstly, waste rock backfilling wells and filling holes are formed in a roof of a mining room, then waste rock backfilling and cementing filling slurry filling are carried out, the backfilling amount and cementing filling slurry blanking amount and proportion are adjusted during filling, cementing filling body protection wall layers are formed before the waste rock reaches the boundary of the mine room, two-step pillars are protected, the waste rock is prevented from eroding theside walls of the two-step pillars, waste rock backfilling and cementing filling slurry filling are carried out at the same time, the filling efficiency is improved, the mixing effect of the waste rock and the filling slurry is improved, and the strength and the stability of the filling body meet the technical requirements.

Description

technical field [0001] The invention relates to the technical field of underground mining, in particular to an ascending empty field followed by waste rock cemented filling method. Background technique [0002] At present, the indicators for evaluating the filling effect in the mining industry mainly include filling body strength, filling body stability and filling speed. Among the applied filling mining methods, the waste rock cemented filling mining method is widely used. This method can effectively utilize the waste rocks generated in the mining process, reduce the transportation cost of waste rocks, avoid environmental and ecological pollution and economic expenditures caused by the accumulation of waste rocks on the surface, and at the same time effectively deal with the gobs and avoid the occurrence of surface waste rocks. Subsidence and other hazards. [0003] During the waste rock cemented filling process, since the waste rock is backfilled by gravity from the uppe...

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Problems solved by technology

[0003] During the waste rock cemented filling process, since the waste rock is backfilled by gravity from the upper measure well, the waste rock will continuously wash away the side wall of the second-step ore pillar, destroying its regularity, causing a large amount of filling body to be mixed into the ore during the second-step mining, increasing the Ore loss and dilution; at the same time, because the current construction process is to pour the tailings filling slurry after the waste rock backfilling work is completed, and the current filling slurry is mostly paste or paste-like, and the fluidity of the slurry is poor, making the filling material The slurry cannot completely fill the voids of the waste rock, and the mixing effect is poor, resulting in the strength and stability of the filling body not meeting the technical requirements

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