A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems

Published on Aug 10, 2018in Energies2.702
· DOI :10.3390/EN11082084
Rui Wu1
Estimated H-index: 1
,
Qingyuan He7
Estimated H-index: 7
+ 2 AuthorsChengguo Zhang12
Estimated H-index: 12
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Abstract
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2016
3 Authors (Bin Yin, ..., Yue Wang)
77 Citations
References30
Newest
#1Bingxiang Huang (CUMT: China University of Mining and Technology)H-Index: 1
#2Shuliang Chen (CUMT: China University of Mining and Technology)H-Index: 1
Last. Xinglong Zhao (CUMT: China University of Mining and Technology)H-Index: 3
view all 3 authors...
With hard roof conditions and the influence of side and front abutment pressures, pressure bump and large deformations periodically occur in the advanced support area of longwall face gob-side gateroads. To control the strong strata behaviours in gob-side gateroads, “directional hydraulic fracturing, to cut off the roof hanging over the adjacent gob area, and pre-fracturing of the roof, located behind the working face being extracted,” are performed. The directional initiation of hydraulic fract...
24 CitationsSource
#1Zhao MingH-Index: 1
#2Zhang ShuaiH-Index: 1
Last. Chen YongH-Index: 1
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To determine the reasonable width of the gob-side entry driving coal pillar in Xieqiao Mine, firstly, the theoretical analysis method was applied to construct the mechanical model for limit equilibrium area of coal seam edge, and the distance obtained via analysis between the bearing pressure extremum and the coal edge was 3.34 m. Secondly, the numerical simulation method was applied to analyze the roadway rock mechanics with different coal pillar widths, and it is concluded that the width of th...
2 CitationsSource
#1Tianhui Ma (DUT: Dalian University of Technology)H-Index: 12
#2Long Wang (DUT: Dalian University of Technology)H-Index: 1
Last. Chunan Tang (DUT: Dalian University of Technology)H-Index: 36
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Severe damage occurs frequently in mine pillars subjected to shear stresses. The empirical design charts or formulas for mine pillars are not applicable to orebodies under shear. In this paper, the failure process of pillars under shear stresses was investigated by numerical simulations using the rock failure process analysis (RFPA) 2D software. The numerical simulation results indicate that the strength of mine pillars and the corresponding failure mode vary with different width-to-height ratio...
10 CitationsSource
#1Deyu Qian (CUMT: China University of Mining and Technology)H-Index: 12
#2Nong Zhang (CUMT: China University of Mining and Technology)H-Index: 15
Last. Nianchao Zhang (CUMT: China University of Mining and Technology)H-Index: 7
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Goaf-side entry driving in underground coal mines could greatly improve coal recovery rates. However, it becomes more difficult to maintain stability, especially in deep coal mines. Pillar width plays a pivotal role in the stability of goaf-side entry driving. To obtain a reasonable and appropriate narrow pillar width, theoretical calculations of the widths of mining-damaged zone and limit equilibrium zone in the pillar are derived according to limit equilibrium theory. Based on the stability is...
45 CitationsSource
#1Zizheng Zhang (CUMT: China University of Mining and Technology)H-Index: 6
#2Jianbiao Bai (CUMT: China University of Mining and Technology)H-Index: 15
Last. Shuai Yan (CUMT: China University of Mining and Technology)H-Index: 7
view all 4 authors...
Abstract An innovative gateroad layout in highly gassy longwall top coal caving in a Chinese coal mine based on gob-side entry retaining (GER) was introduced. The numerical model was used to design the rational roadside backfill body (RBB) with high-water quick-setting materials. In order to improve the reliability of the numerical modeling, the double-yield model for gob modeling and the strain-softening model for RBB modeling are validated in detail. The results of the validated model indicate...
119 CitationsSource
#1Manchao He (CUMT: China University of Mining and Technology)H-Index: 26
#2Guolong Zhu (CUMT: China University of Mining and Technology)H-Index: 1
Last. Zhibiao Guo (CUMT: China University of Mining and Technology)H-Index: 1
view all 3 authors...
Abstract With the third innovation in science and technology worldwide, China has also experienced this marvelous progress. Concerning the longwall mining in China, the “masonry beam theory” (MBT) was first proposed in the 1960s, illustrating that the transmission and equilibrium method of overburden pressure using reserved coal pillar in mined-out areas can be realized. This forms the so-called “121 mining method”, which lays a solid foundation for development of mining science and technology i...
69 CitationsSource
#1Xiaowei Feng (CUMT: China University of Mining and Technology)H-Index: 9
#2Nong Zhang (CUMT: China University of Mining and Technology)H-Index: 15
This study investigates the stability problem of gob-side entry retaining (GER) and backfilling wall which located under the key block B. Based on the combined research of elastic–plastic mechanics, structure mechanics and modern theory of mining-induced pressure, the caving characteristic and roof structure over the GER were analyzed, and the vertical force and the torque on retained entry roof were also derived as the position for the retained entry varies. On the basis of the specific geology...
11 CitationsSource
#1Yunliang Tan (SDUST: Shandong University of Science and Technology)H-Index: 16
#2Feng-hai Yu (SDUST: Shandong University of Science and Technology)H-Index: 6
Last. Tong-bin Zhao (SDUST: Shandong University of Science and Technology)H-Index: 13
view all 4 authors...
•As a new approach, harmonically flexible-hard gob-side retaining mechanical model was firstly proposed, which provides us both compression and supporting force required for a gob-side retaining wall, by considering hard roof weighting.•The new flexible-hard artificial wall is of large compressibility and high supporting capacity.•The thicknesses of flexible layer and hard layer of artificial wall were quantitatively determined.•The ratios of flexible and hard material were tested and correspond...
124 CitationsSource
#1Yao QianglingH-Index: 1
#2Zhou JianH-Index: 1
Last. Jiang ZhigangH-Index: 1
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The borehole stress-meter was employed in this study to investigate the distribution of the side abutment stress in roadway subjected to dynamic pressure. The results demonstrate that the side abutment stress of the mining roadway reaches a peak value when the distance to the gob is 8 m and the distribution curve of the side abutment stress can be divided into three zones: stress rising zone, stress stabilizing zone, and stress decreasing zone. Further numerical investigation was carried out to ...
10 CitationsSource
#1Wang Meng (CUMT: China University of Mining and Technology)H-Index: 2
#1Meng Wang (CUMT: China University of Mining and Technology)H-Index: 2
Last. Shenggen Cao (CUMT: China University of Mining and Technology)H-Index: 1
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Gob-side entry (GSE) is defined as caving that is developed along the gob with a yield pillar. Compared to other entry layouts, GSE has many advantages, such as the advantageous stress environment, high recovery rate, and prevention of coal bumps. Recently, many Chinese coal mines have reached deep mining depths. As a result of the high stress in deep mining conditions, severe bulk and dilatant deformation has occurred in deep GSE (DGSE). The direct problems in this situation, such as interrupti...
34 CitationsSource
Cited By8
Newest
#1Rui Wu (Jiangxi University of Science and Technology)
#2Penghui Zhang (Jiangxi University of Science and Technology)
Last. Qingyuan He (CUMT: China University of Mining and Technology)
view all 0 authors...
At present, non-pillar entry protection in longwall mining is mainly achieved through either the gob-side entry retaining (GER) procedure or the gob-side entry driving (GED) procedure. The GER procedure leads to difficulties in maintaining the roadway in mining both the previous and current panels. A narrow coal pillar about 5–7 m must be left in the GED procedure; therefore, it causes permanent loss of some coal. The gob-side pre-backfill driving (GPD) procedure effectively removes the wasting ...
Source
#2Xiaobin Li (CUMT: China University of Mining and Technology)H-Index: 2
Last. Jiaqi Hou (CUMT: China University of Mining and Technology)
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Taking roadway along gob with narrow coal pillar in fully mechanized top coal caving face for extra thick coal seam as the research object, this paper systematically studies two key problems of asymmetric failure mechanism and control technology of gob side entry driving in extra thick coal seam by using comprehensive research methods such as theoretical analysis, numerical simulation and field measurement. Firstly, by establishing the mechanical model of overlying strata of gob side entry in fu...
Source
#1Xiaobin Li (CUMT: China University of Mining and Technology)H-Index: 2
#2Yongqiang Zhao (CUMT: China University of Mining and Technology)H-Index: 2
Last. Fulian He (CUMT: China University of Mining and Technology)H-Index: 3
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This paper adopts an integrated method of field test and numerical simulation to study coal pillar width and surrounding rock control of gob-side entry in extra-thick coal seam. Field test showed that when the coal pillar width was 30 m, the average plastic failure areas of the roof, coal pillar rib and virgin coal rib were 7.6 m, 4.9 and 3.8 m, respectively, and severe roof subsidence and large deformation of coal pillar rib occurred during the mining of the working face. A numerical model is e...
1 CitationsSource
#1Dongdong Chen (CUMT: China University of Mining and Technology)H-Index: 3
#2Qing Zhang (CUMT: China University of Mining and Technology)H-Index: 2
Last. Long Wang (CUMT: China University of Mining and Technology)H-Index: 1
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1 CitationsSource
#1Liu Shuaigang (CUMT: China University of Mining and Technology)H-Index: 2
#2Jianbiao Bai (CUMT: China University of Mining and Technology)H-Index: 15
Last. Wenda Wu (CUMT: China University of Mining and Technology)H-Index: 3
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In traditional sequential single-wing mining practices, one-entry longwall mining systems make it challenging to efficiently and smoothly transfer mining equipment during a continuous mining sequence. In two-entry longwall systems, the headgate of the current panel and the tailgate of the next panel are excavated parallel to one another, effectively creating space for the transfer of mining equipment. The tailgate of the panel, however, is subjected to high-mining-induced stresses, causing sever...
3 CitationsSource
#1Tao Yang (Xi'an University of Science and Technology)H-Index: 1
#2Jie Zhang (Xi'an University of Science and Technology)H-Index: 1
China has a large number of coal resources in “three-soft” geological conditions. The roof of these coal seams is soft and has low strength. Under this condition, gob-side entry retaining can be carried out under the guidance of roof leading holes to achieve the goal of nonblasting roof cutting and roadway retaining. In this paper, the technology of void weakening, roof cutting, and pressure relief along gob retaining roadway is investigated. The force model of void is established, and the stres...
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#1Huiqiang Duan (Inner Mongolia University of Science and Technology)H-Index: 2
#2Ming Sun (Inner Mongolia University of Science and Technology)H-Index: 1
Last. Qing Li (Inner Mongolia University of Science and Technology)H-Index: 1
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Gob-side entry retaining technology is an effective method for sustainable exploitation of coal resources and has been widely used in China. However, there are a large surrounding rock deformation and hard support in the gob-side entry retaining. In this paper, take the gob-side entry retaining in thin coal seam from Jiyang Coal Mine as the engineering background. Firstly, using FLAC software to simulate and analyze the deformation and stress distribution of gob-side entry surrounding rock in di...
1 CitationsSource
#1Shengrong Xie (CUMT: China University of Mining and Technology)H-Index: 3
#2Xiaoyu Wu (CUMT: China University of Mining and Technology)H-Index: 1
Last. Yuxin Ren (CUMT: China University of Mining and Technology)
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Automatic roadways on gob-side entry retaining with no-pillars are used for longwall mining technology. The mining technology with no-pillars can recover coal pillar resources and reduce the amount and cost of roadway excavations. Automatic roadway technology for cutting roofs by combined support on gob-side entry retaining with no-pillars is adopted for the condition of thick immediate roof and medium-thick coal seam mining, cutting off the immediate roof and the main roof on the gob by combine...
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#1Qingheng Gu (SDUST: Shandong University of Science and Technology)H-Index: 3
#2Ru Wenkai (SDUST: Shandong University of Science and Technology)H-Index: 2
Last. Qiang Xu (SDUST: Shandong University of Science and Technology)H-Index: 3
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To investigate the mine pressure behavior of weakly cemented roof of gob-side entry retaining (GER) in fully-mechanized top coal caving mining, the structural characteristics of lateral immediate roof in 4-1101 working face of Awuzisu Coal Mine were studied by using of numerical simulation, theoretical analysis and in-site measurement. Mechanical model of “equivalent block” composite structure of immediate roof was established, and verified by field test. The results indicate that weakly cemente...
2 CitationsSource