Abstract
Evolution Characteristics of Pressure-Arch and Elastic Energy during Shallow Horizontal Coal Mining
Highlights
The stability of overlying strata during shallow coal mining, such as the large-scale roof falling and step-like ground subsidence, is the key problem that can restrict the safety mining in the mines [1]
Results show that the continuous pressure-arch can form when the horizontal stress exceeds the vertical stress, and the elastic energy of the roof is released by the mining unloading effect
The principal stress of the overlying strata near the mining field was deviated into an arch, and the zone of increasing principal stress was only formed at two sides of the mined-out area
Summary
The stability of overlying strata during shallow coal mining, such as the large-scale roof falling and step-like ground subsidence, is the key problem that can restrict the safety mining in the mines [1]. The self-bearing structure of pressure-arch can form in the overlying strata after the coal mining, and this structure can support the load of the upper strata and soil layer, so the weighting intensity of the working face is determined by the caved rock in the unloading zone under the inner boundary of the pressurearch. It is necessary to reveal the distribution characteristics of the stress field and energy field in the mining field, and to analyse the stability of the overlying strata during shallow coal mining based on the evolution characteristics of the pressure-arch. The pressure-arch in the overlying strata during coal mining usually affected the roof stability, and the factors such as buried depth, mining conditions, overburden property, and the horizontal stress had influences on the distribution of the pressure-arch [5]. The abnormal roof weighting control was a technical problem during the shallow coal mining
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