Ground stability of underground gateroad with 1 km burial depth: A case study from Xingdong coal mine, China

Zhang, Guangchao; He, Fulian; Lai, Yonghui; Jia, Hong-guo

doi:10.1007/s11771-018-3834-4

Cited by 36 publications

(15 citation statements)

References 19 publications

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“…[42][43][44] In addition, a high-strength concrete spray layer can seal the shallow surrounding rock to effectively limit the arbitrary expansion of the surrounding rock fracture zone, thereby maintaining the integrity of the surrounding rock. [45][46][47][48][49][50][51][52][53][54][55][56][57] It can be seen that the coupled actions of the high-strength pretensioned anchor bolts and anchor cables with surface protecting components such as the plate and steel mesh, along with the high-strength concrete spray layer, constitute the high-strength "anchorage-mesh-shotcrete" support system for the goaf roof, as shown in Figure 5…”

Section: Resultsmentioning

confidence: 99%

“…However, the combined support of the high‐strength pretensioned anchor bolts and anchor cables can place the surrounding rock in a compression state and effectively control the deformation and failure of the surrounding rock in deep and shallow anchorage zones 42‐44 . In addition, a high‐strength concrete spray layer can seal the shallow surrounding rock to effectively limit the arbitrary expansion of the surrounding rock fracture zone, thereby maintaining the integrity of the surrounding rock 45‐57 . It can be seen that the coupled actions of the high‐strength pretensioned anchor bolts and anchor cables with surface protecting components such as the plate and steel mesh, along with the high‐strength concrete spray layer, constitute the high‐strength “anchorage‐mesh‐shotcrete” support system for the goaf roof, as shown in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

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Combined support technology for main roadway passing through goaf: A case study

Chen

Zhang

Xie

et al. 2020

Energy Science & Engineering

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Combined support technology for main roadway passing through goaf: A case study

Chen

Zhang

Xie

et al. 2020

Energy Science & Engineering

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“…In Section 5, based on the results, conclusions are drawn and reported. Shock and Vibration [27,28]. erefore, the entries of conventional GER easily lose stability, and the deformation of the entries becomes difficult to control.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Influence of Roof Fracturing Angle on the Stability of Gob‐Side Entry Subjected to Dynamic Loading

Guo

Zhang

et al. 2019

Shock and Vibration

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In order to increase the mining rate of underground coal resources, an innovative nonpillar underground coal mining approach (fracturing roofs to maintain entry (FRME)) has been widely applied in China. The effect of roof fracturing determines whether the entry can be retained successfully or not. In this work, the tail entry of 21304 panel in Chengjiao Coal Mine (China) has been considered as the test site. The coal mine is located approximately 900 m underground. A numerical investigation on the relationship between the entry stability and roof fracturing angle was conducted. In order to investigate the reasonable scope of roof fracturing angle under static and dynamic loadings, the double-yield model was employed to simulate the gob materials, and the input parameters of the model were calibrated meticulously using the method of inversion analysis. Furthermore, dynamic loading was applied to research the influence of fracture of hard rock strata on the entry stability. The global model was validated with the field data. The simulation results demonstrate that the reasonable scope of the roof fracturing angle is 10–20°, in which case the distributions of vertical stress are favorable to the stability of gob-side entry. Additionally, the dynamic responses were found to be relatively moderate. The numerical method could provide a significant reference for the design of FRME approach.

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“…Mohammadi et al [16] demonstrated that the extension of excavation-damaged zone above the retained entry occurs as the coal pillar width decreases from 30 m to 10 m based on a computational geometric model. Shen et al [17] concluded that the roof with weak plane for the retained entry is easily subjected to shear failure when the ratio of the pillar's width and height is less than 8 m. Several significant researches have great influence on the stability of the retained entry [18][19][20][21][22]. e method of cutting hard roof to achieve the pressure relief has been widely used in the world [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Experiment on Mine Ground Pressure of Stiff Coal‐Pillar Entry Retaining under the Activation Condition of Hard Roof

Shen

Guo

et al. 2018

Advances in Civil Engineering

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In mining excavation, the retained entry with stiff coal pillar is situated in the strong mine ground pressure. Influenced by mining abutment stress and dynamic stress (the vibration signal) induced from the hard roof activation, the retained entry may be subjected to roof separation, supporting body failure, severe floor heave, and even roof collapse. Based on a 2D physical model, an experimental method with plane-stress conditions was used to simulate the mechanical behavior of the rock strata during mining. In this experiment, three monitoring systems were adopted to reveal the characteristics of the strong mine ground pressure in the stiff coal-pillar entry retaining. The results show that the hard roof undergoes bending down, fracture, and caving activation successively until it is able to support overlying loads. The abutment stress which is induced from the loading transfer in stiff coal pillar is larger than that in other rocks around the retained entry in amplification, and overlying loads above the worked-out area have a loading effect on the unworked-out area. When the hard roof is situated in the activation state, the dynamic stress is generated from the hard roof activation, which is verified by the great saltation of acoustic emission signals. The results of mining ground pressure in the physical model can clearly illustrate the mechanical behavior of the rock around the retained entry with stiff coal pillar.

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Ground stability of underground gateroad with 1 km burial depth: A case study from Xingdong coal mine, China

Cited by 36 publications

References 19 publications

Combined support technology for main roadway passing through goaf: A case study

Combined support technology for main roadway passing through goaf: A case study

Numerical Investigation of the Influence of Roof Fracturing Angle on the Stability of Gob‐Side Entry Subjected to Dynamic Loading

Experiment on Mine Ground Pressure of Stiff Coal‐Pillar Entry Retaining under the Activation Condition of Hard Roof

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