2020
DOI: 10.1007/s12517-020-06234-5
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Field and numerical investigation on the stability of coal pillars of gob-side entry driving with top coal

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Cited by 18 publications
(10 citation statements)
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“…With the large-scale mining of coal, shallow resources are gradually depleted, and the mine gradually enters the deep mining state, with the increase of mining depth, due to the concentration of stress above the re-recovery work surface caused by the large deformation of the surrounding rock of the upper roadway, impact pressure, coal (rock) explosion, and coal and gas protrusion, and other geological disasters are also very serious, in the process of working surface recovery, along the empty roadway roof by the unbroken part of the rock layer above the coal seam goaf section squeezing and stretching, resulting in a bottom drum and other violent deformation; the rotational sinking deformation of this part of the undeveloped rock layer further aggravates the transfer of the overburden load to the surrounding rock of the left lane, so that the surrounding rock along the empty roadway is subjected to greater additional stress, in order to achieve the intact retention protection along the empty roadway during the process of working surface recovery, through the advanced blasting precracking roof pressure unloading method, interrupt the key role rock layer at the upper end of the protected alley, weaken the stress transmission of the top plate of the goaf to the roof plate of the left lane, avoid the rapid pressure increase caused by the impact of the roof plate breaking, slow down the movement of the overburden rock layer, and avoid the collapse of the overburden rock layer after the 7 Geofluids coal seam is mined. Rotational stretching occurs on the critically critical rock formations that protect the roof of the roadway far above [26,27].…”
Section: Theoretical Analysis Of Cutting the Top And Unloadingmentioning
confidence: 99%
“…With the large-scale mining of coal, shallow resources are gradually depleted, and the mine gradually enters the deep mining state, with the increase of mining depth, due to the concentration of stress above the re-recovery work surface caused by the large deformation of the surrounding rock of the upper roadway, impact pressure, coal (rock) explosion, and coal and gas protrusion, and other geological disasters are also very serious, in the process of working surface recovery, along the empty roadway roof by the unbroken part of the rock layer above the coal seam goaf section squeezing and stretching, resulting in a bottom drum and other violent deformation; the rotational sinking deformation of this part of the undeveloped rock layer further aggravates the transfer of the overburden load to the surrounding rock of the left lane, so that the surrounding rock along the empty roadway is subjected to greater additional stress, in order to achieve the intact retention protection along the empty roadway during the process of working surface recovery, through the advanced blasting precracking roof pressure unloading method, interrupt the key role rock layer at the upper end of the protected alley, weaken the stress transmission of the top plate of the goaf to the roof plate of the left lane, avoid the rapid pressure increase caused by the impact of the roof plate breaking, slow down the movement of the overburden rock layer, and avoid the collapse of the overburden rock layer after the 7 Geofluids coal seam is mined. Rotational stretching occurs on the critically critical rock formations that protect the roof of the roadway far above [26,27].…”
Section: Theoretical Analysis Of Cutting the Top And Unloadingmentioning
confidence: 99%
“…Therefore, it is of great guiding significance for safe and efficient production of coal mine by analyzing the stress distribution and plastic characteristics of surrounding rock, and reasonably designing narrow coal pillar width and control technology. 6,7 In view of GED technology, scholars have mainly carried out the following research: (1) main advantages: in the low-stress zone, 8 improving the utilization rate of coal resources, 9,10 accelerating the excavating rate 11 ; (2) in terms of large deformation and failure mechanism of surrounding rock: a theoretical mechanical model of surrounding rock structure, 12,13 influence characteristics of basic roof thickness on surrounding rock stability, 14 disturbance mechanism of basic roof subsidence on narrow coal pillar, [15][16][17] failure mechanism of deep topcoal caving face, 18 distribution and evolution laws of surrounding rock displacement and stress 19,20 were studied; (3) narrow coal pillar width [21][22][23] and its control technology 24,25 were determined under specific conditions.…”
Section: Introductionmentioning
confidence: 99%
“…Since the roadside filling body and coal pillars are used for the gob-side entry protection, they are jointly referred to as "entry protection coal and rock mass" (EPCARM). e solid backfill mining involving gob-side entry is generally divided into gob-side entry driving (GED) and gob-side entry retaining (GER) techniques [28,29]. Although the former (GED) technique combines the advantages of filling and entry retaining, the most frequent stress environment of the EPCARM is not favorable for its application, and the current research efforts are mainly focused on the GER.…”
Section: Introductionmentioning
confidence: 99%