Study Of Large Section Subinclined Head Chamber Affected By Mining Action Floor Heave Controlling Technology

In order to facilitate transportation of large equipment and controlling of underground production,tunnel or chamber of large section is selected in coal.For underground chamber,the larger section area,the more complex surrounding rock stress distribution,roadway support is also more difficult.In the coal mine,there are a large number of large section main chamber,main chamber is responsible for transportation,power distribution or workers to rest and so on.The main chamber in a complicated geological condition or stress environment is easily destroyed.Especially main chamber in charge of transportation production,large equipment installed,their requirements for the integrity of the floor is relatively high.Floor deformation and failure is likely to result in the coal mine can not be normal production,or even an accident.How to effectively control main chamber floor or surrounding rock has becomed the focus of many experts.In the mining,main chamber is easy to be affected by mining.Based on the theoretical analysis,this paper focuses on mechanism of floor failure,the influence of the upper coal seam mining on surrounding rock stress and measure of controlling heave.The critical value of floor failure is analyzed by using the model of layered floor,by Gao Keng coal geological data,and inclined head chamber floor has broken from the calculation result.The failure depth of chamber floor is calculated by using the loose mechanics model.The subinclined head chamber model is builded by using FLAC3 D software.Useing field test data,the reason of the floor failure under the influence of mining is analyzed numerically.According to the environment of surrounding rock,stress distributio and the control technology of floor heave in complex stress environment, Steps combined support scheme is proposed.The effect of borehole pressure relief on bottom drum control is analyzed by numerical simulation.The influence of the upper coal seam mining on subinclined head chamberis analysised in the form of side anchor and bottom plate anchor.The results show that the new support scheme has good control effect on the chamber floor.The new supporting scheme is applied to the large section chamber of head of the Gao Keng coal to be used for the treatment of the bottom drum.The data obtained from the field monitoring show that borehole pressure relief has a very good control effect on floor failure.Under the new support scheme,the floor deformation is reduced significantly.This paper is based on the project "The Gao Keng coal subinclined shaft head chamber bottom drum controlling",through field monitoring analysis,the critical value and depth of floor failure are derived by using the mechanical model.The mechanism and control method of the floor heave are analyzed and the effect of bottom drum treatment is detected.It can be reference for the similar mine bottom drum controlling.