Study on Mechanical Properties of Roof Rocks with Different Cutting Inclinations

Ma, Xingen; He, Manchao; Liu, Dongqiao; He, Liulv; Jiang, Qianqian

doi:10.1007/s10706-018-00764-2

Cited by 7 publications

(11 citation statements)

References 1 publication

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“…After mining, the dense single pillars are arranged close to the precracked line to support the roadside. The roof of the gob is automatically degraded along the slit surface due to its self‐weight and mine pressure, thus retaining a slot in the working surface which can be used as a mining roadway for the adjacent working face in the future. The cutting roof and release pressure mining technology has changed the layout of the traditional longwall mining side and the double‐district roadway, creating a new method of digging a single lane .…”

Section: Principle Of the Cutting Roof And Release Pressure Mining Tementioning

confidence: 99%

Evolution and application of airflow permeability characteristics of gob in roof cutting and pressure releasing mining method

Chen

Wang

et al. 2020

Energy Science & Engineering

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Cutting roof and release pressure technology has changed the pressure transmission mode of the roof and the caving characteristics of roof rock, which in turn has changed the permeability evolution of the gob. To obtain the permeability characteristics of the gob for the roof cutting and pressure releasing mining method, a mathematical model for the gob voidage and permeability was established by analyzing the overlying strata movement law and the lateral stress variation in the gob. The airflow migration law of haulage roadway 12 201 in Halagou coal mine was studied using Fluent software and an established mathematical model. The main conclusions obtained are as follows: The overburden pressure and lateral stress in the gob gradually increase with the advancement of the working face; along the direction of the retaining roadway, there are two roadway windflows entering the critical zones (the 22-100 m and 390-398 m sections). The inflow at these two sections accounted for 59% of the total air inflow, of which the most critical is the 28-53 m section, which accounts for 43% of the total air inflow in the two severe air leakage sections. The findings of this work provide a theoretical basis for the implementation of antileakage technology in the gob under the roof cutting and pressure releasing mining method and help reduce the risk of spontaneous combustion in the gob. K E Y W O R D Scaving characteristics of roof rock, cutting roof and release pressure, gob, voidage and permeability model 2074 |

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Section: Principle Of the Cutting Roof And Release Pressure Mining Tementioning

confidence: 99%

Evolution and application of airflow permeability characteristics of gob in roof cutting and pressure releasing mining method

Chen

Wang

et al. 2020

Energy Science & Engineering

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“…The roof of the goaf is automatically degraded along the slit surface due to its self-weight and mine pressure; thus, a slot in the working surface is retained, which can be used as a mining roadway for the following adjacent working face. 33 , 34 The technology realizes pillarless mining, greatly increasing the recovery of coal resources. It has many advantages such as optimizing the stress of the surrounding rock in the stope and reducing the amount of road excavation.…”

Section: Introductionmentioning

confidence: 99%

“…Along the direction of the trough, the directional blasting technology can precrack the roof, forming a slit surface along the goaf side of the retaining roadway. , After mining, the dense single pillars are arranged close to the precracked line to support the roadside. The roof of the goaf is automatically degraded along the slit surface due to its self-weight and mine pressure; thus, a slot in the working surface is retained, which can be used as a mining roadway for the following adjacent working face. , The technology realizes pillarless mining, greatly increasing the recovery of coal resources. It has many advantages such as optimizing the stress of the surrounding rock in the stope and reducing the amount of road excavation. , The working face also adopts ″Y″-type ventilation, but different from the reserved lane along the goaf, the goaf behind the working face is directly adjacent to the reserved lane, and the wall of the retained roadway is the roof of the goaf after the collapse, the broken rocks are piled up to form walls, and only simple shotcreting is performed, and the mined-out area is open (see Figure ).…”

Section: Introductionmentioning

confidence: 99%

Distribution and Prevention of CO in a Goaf of a Working Face with Y-Type Ventilation

et al. 2021

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In recent years, the mining technology of ″roof cutting and pressure releasing″ has appeared in China. It is called China’s third mining revolution. The technology of ″roof cutting and pressure releasing″ has changed the traditional working face ventilation system and the boundary conditions of a goaf. The law of air leakage in the goaf has changed, resulting in changes in the distributions of CO and other disaster gases. In order to ensure the promotion of this advanced mining technology safely, research on the distributions of CO and other disaster gases is very necessary. By installing CO sensors in the air intake lanes, gob-side entry retaining, and goaf, the distribution of CO in the goaf during the advancement of the working face under the ″roof cutting and pressure releasing″ mining method is studied. The concentration of CO in the upper corners of the working face under the traditional mining method and the ″roof cutting and pressure releasing″ mining method was compared and analyzed. The results show that the CO in the experimental working face mainly comes from the oxidation of the residual coal; after analysis, the CO concentration in the goaf is divided into three areas: the slowly increasing area, sharply increasing area, and attenuation area; the CO concentration in the upper corner of the working face of Y-shaped ventilation with ″roof cutting and pressure releasing″ mining is much lower than that in the upper corner of the working face of U-shaped ventilation in the traditional mining; In order to prevent the oxidation and heating of the residual coal in the goaf to produce CO, comprehensive prevention measures for CO escape in the goaf have been adopted. After actual production verification, the prevention and control measures show good effects to ensure the safe and effective production of the working face.

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“…In BFRT parameter researches, Ma et al [12] studied the fracturing angle by theoretical analysis and mechanical tests and concluded that the fracturing angle had a great influence on stress around surrounding rocks; and a rational fracturing angle was given out in a certain geology condition. Hou et al [13] analyzed the fracturing height through discrete element numerical software UDEC in Nanyang coal mine; they presented that BFRT could efficiently eliminate the crushing damage of the roof, and the deformation decreased with the fracturing height increase.…”

Section: Introductionmentioning

confidence: 99%

Study on Stability Control of Retained Gob‐Side Entry by Blasting Fracturing Roof Technology in Thick Immediate Roof

Guo

et al. 2021

Shock and Vibration

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A retained gob-side entry technique is popular in longwall mining coal mines, because the excavation of an entry is reduced for the next panel. However, it is influenced by multiple excavations and mining, so the stability control of the surrounding rock becomes a problem. In view of the above problems, a typical retained gob-side entry with thick immediate roof was carried out, and a blasting fracturing roof technology was used in it to improve the stress environment, reduce the deformation and damage, and ensure stability and safety. To study the fracturing roof parameters, a global model with thick immediate roof considering strain-soft and double-yield constitution was built. It found that the stress, damage range, and deformation of surrounding rock were closely related to the height and angle of fracturing roof, and an optimal case was given out. The simulation result was applied to the field practice, and a good application effect was achieved. The above technique and research method can be used as a reference for the coal mine with similar conditions.

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Study on Mechanical Properties of Roof Rocks with Different Cutting Inclinations

Cited by 7 publications

References 1 publication

Evolution and application of airflow permeability characteristics of gob in roof cutting and pressure releasing mining method

Evolution and application of airflow permeability characteristics of gob in roof cutting and pressure releasing mining method

Distribution and Prevention of CO in a Goaf of a Working Face with Y-Type Ventilation

Study on Stability Control of Retained Gob‐Side Entry by Blasting Fracturing Roof Technology in Thick Immediate Roof

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