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Instability Mechanism and Control of Roadway Subjected to Severe Mining Dynamic Load with Double Roadway Layout Mining Face
https://orcid.org/0000-0001-8823-1003
Abstract Severe deformation and instability problem of surrounding rock was caused by multiple severe mining dynamic load for roadway. Auxiliary haulage roadway 3101 for Menkeqing mine’s first working face was taken as engineering background in this paper. Field observation, borehole observation and numerical simulation were adopted to systemically analyze deformation and failure law of surrounding rock under double roadway driving and working face mining. The results were showed as follow: (1) When the roadway was subjected to the action of double roadway driving and working face mining, the deformation of surrounding rock began to increase sharply until 350 m behind the working face, characterized by serious subsidence in roof, heavy in floor and asymmetric destruction in two ribs. The deformation of the surrounding rock tended to be stable until 550 m in the rear of the working face; (2) Low strength and poor mechanical properties of surrounding rock, multiple mining and long-term effects of high stress are main reason of the overall instability of the roadway. (3) The key to control of the surrounding rock was to improve the integrity of the surrounding rock and to strengthen the key parts (coal pillar rib and roof) of roadway. The specific measures were as follows: improving the stability of coal pillar rib and roof, avoiding the transfer of high supporting stress to the floor, strengthening surface protecting of support structure, and improving the integrity of the roadway. According to the above research, a suitable strengthening control technology of surrounding rock which included “all cross-sectional bolt-wire mesh + high strength and lengthen bolt + high pre-tightening force cable” was put forward for field engineering practice. Through numerical simulation and engineering practice, the subsidence of the roof and the asymmetric deformation of two ribs could be effectively controlled, and ensured the stability of retained roadway in the process of mining.
Instability Mechanism and Control of Roadway Subjected to Severe Mining Dynamic Load with Double Roadway Layout Mining Face
https://orcid.org/0000-0001-8823-1003
Abstract Severe deformation and instability problem of surrounding rock was caused by multiple severe mining dynamic load for roadway. Auxiliary haulage roadway 3101 for Menkeqing mine’s first working face was taken as engineering background in this paper. Field observation, borehole observation and numerical simulation were adopted to systemically analyze deformation and failure law of surrounding rock under double roadway driving and working face mining. The results were showed as follow: (1) When the roadway was subjected to the action of double roadway driving and working face mining, the deformation of surrounding rock began to increase sharply until 350 m behind the working face, characterized by serious subsidence in roof, heavy in floor and asymmetric destruction in two ribs. The deformation of the surrounding rock tended to be stable until 550 m in the rear of the working face; (2) Low strength and poor mechanical properties of surrounding rock, multiple mining and long-term effects of high stress are main reason of the overall instability of the roadway. (3) The key to control of the surrounding rock was to improve the integrity of the surrounding rock and to strengthen the key parts (coal pillar rib and roof) of roadway. The specific measures were as follows: improving the stability of coal pillar rib and roof, avoiding the transfer of high supporting stress to the floor, strengthening surface protecting of support structure, and improving the integrity of the roadway. According to the above research, a suitable strengthening control technology of surrounding rock which included “all cross-sectional bolt-wire mesh + high strength and lengthen bolt + high pre-tightening force cable” was put forward for field engineering practice. Through numerical simulation and engineering practice, the subsidence of the roof and the asymmetric deformation of two ribs could be effectively controlled, and ensured the stability of retained roadway in the process of mining.
Instability Mechanism and Control of Roadway Subjected to Severe Mining Dynamic Load with Double Roadway Layout Mining Face
https://orcid.org/0000-0001-8823-1003
Abstract Severe deformation and instability problem of surrounding rock was caused by multiple severe mining dynamic load for roadway. Auxiliary haulage roadway 3101 for Menkeqing mine’s first working face was taken as engineering background in this paper. Field observation, borehole observation and numerical simulation were adopted to systemically analyze deformation and failure law of surrounding rock under double roadway driving and working face mining. The results were showed as follow: (1) When the roadway was subjected to the action of double roadway driving and working face mining, the deformation of surrounding rock began to increase sharply until 350 m behind the working face, characterized by serious subsidence in roof, heavy in floor and asymmetric destruction in two ribs. The deformation of the surrounding rock tended to be stable until 550 m in the rear of the working face; (2) Low strength and poor mechanical properties of surrounding rock, multiple mining and long-term effects of high stress are main reason of the overall instability of the roadway. (3) The key to control of the surrounding rock was to improve the integrity of the surrounding rock and to strengthen the key parts (coal pillar rib and roof) of roadway. The specific measures were as follows: improving the stability of coal pillar rib and roof, avoiding the transfer of high supporting stress to the floor, strengthening surface protecting of support structure, and improving the integrity of the roadway. According to the above research, a suitable strengthening control technology of surrounding rock which included “all cross-sectional bolt-wire mesh + high strength and lengthen bolt + high pre-tightening force cable” was put forward for field engineering practice. Through numerical simulation and engineering practice, the subsidence of the roof and the asymmetric deformation of two ribs could be effectively controlled, and ensured the stability of retained roadway in the process of mining.
Instability Mechanism and Control of Roadway Subjected to Severe Mining Dynamic Load with Double Roadway Layout Mining Face
He, Fu-lian (author) / Zhao, Yong-qiang (author) / Xie, Fu-xing (author) / Liu, Jun (author)
2019
Article (Journal)
Electronic Resource
English
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
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