Abstract
Because of the unique natural geography, geological structure, and ecological environment, there are serious geological disasters and environmental damage caused by the high‐intensity mining in Western China. It seriously restricts the development of coal resources and the protection of ecological environment. In order to fully capture the law of key stratum breakage with high‐intensity mining, the IMS microseismic system was introduced into Xiaojihan coal mine which is a typical high‐intensity mining mine in Western China, and the whole process dynamic monitoring was carried out. The process of key stratum breakage was analysed by MS data, which were in agreement with the pressure analysis results of the hydraulic support of the working face. The results showed that there were the obvious forewarning characteristics in microseismic event number, energy release, energy index, Schmidt number, coefficient of seismic response, and b value when the key stratum was breaking. Then, a method to discriminate the breakage of key stratum was proposed by using the forewarning characteristics, which could provide the guidance for prevention and control of geological hazards in the working face with high‐intensity mining.
Highlights
In China, the exploitation of coal resource has been transferred to Western China [1], which possesses the unique natural geography, geological structure, and ecological environment
We introduce the MS monitoring system into Xiaojihan coal mine, which is a typical highintensity mining mine in Western China. rough real-time monitoring, the relationship between key stratum (KS) fracture and MS event characteristics is studied, and a KS fracture discrimination method based on MS parameters is proposed. is provides both a basis for the study of roof stability and disaster prevention under the condition of high-intensity mining and a reference for MS monitoring of high-intensity mining face
E periodic weightings were the breakage of the inferior KS 1 and the small range cracks or local breakage of the inferior KS 2, and even only the breakage of the inferior KS 1 and little effect on the inferior KS 2
Summary
In China, the exploitation of coal resource has been transferred to Western China [1], which possesses the unique natural geography, geological structure, and ecological environment. The high-intensity mining in Western China has caused serious geological disasters and environmental damage [2]. It seriously restricts the coal exploitation and the ecological protection, which has drawn much attention from the Chinese government [3]. In order to achieve safe production, it is very urgent to carry out research on rock mass failures and strata movement under high-intensity mining conditions. Rough model experiment, field measurement, and numerical simulation, Miao et al [7, 8] studied the breakage and collapse feature of KS around coal face and its influence on rock pressure in fully-mechanized coal face Since Qian et al [6] put forward KS theory, many scholars have studied it. rough model experiment, field measurement, and numerical simulation, Miao et al [7, 8] studied the breakage and collapse feature of KS around coal face and its influence on rock pressure in fully-mechanized coal face
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