The Experts below are selected from a list of 708 Experts worldwide ranked by ideXlab platform

Shengguo Jing - One of the best experts on this subject based on the ideXlab platform.

  • Large-Deformation Failure Mechanism of Coal-Feeder Chamber and Construction of Wall-Mounted Coal Bunker in Underground Coal Mine with Soft, Swelling Floor Rocks
    Advances in Civil Engineering, 2019
    Co-Authors: Wang Xingkai, Wenbing Xie, Jianbiao Bai, Shengguo Jing
    Abstract:

    In traditional vertical Coal Bunker systems, a Coal-feeder chamber (CFC) must bear the whole weight of the Bunker. However, maintenance of CFCs within soft, swelling floor rock is a challenge faced in underground Coal mines. Floor-heave control is a complex problem and is still not well-solved. Moreover, there is no report on the construction of Bunker without a CFC, especially under such weak floor-rock conditions. Based on the serious CFC collapse case at Xiashijie mine, China, this work analyzed the deformation characteristics, main influencing factors, and failure mechanisms of the CFC using a FLAC numerical model. The results indicate that the intrusion of water weakens the strength of the floor rock and causes significant expansive forces; thus, large deformations and tensile failure occur first in the floor, further causing shearing and tensile damage of the reinforced column and even overall instability of the CFC. Then, a new wall-mounted Coal Bunker (WMCB), without building the CFC, is proposed. The FLAC3D program was adopted to study the stability of the rocks surrounding the new Bunker, and an optimized reinforcement scheme was determined. More importantly, a self-bearing system, which includes self-designed H-steel beams, H-steel brackets, and self-locking anchor cables, was proposed and constructed to bear the whole weight of the Bunker. The stability of WMCB was verified by a theoretical safety assessment and field test. The invented WMCB could remain stable in spite of severe floor heave. This work can provide helpful references for the construction of vertical Bunkers without CFCs in Coal mines with soft, swelling floor rocks.

  • A Case Study on Large Deformation Failure Mechanism of Coal given Chamber and Invention of a New Wall-Mounted Coal Bunker in Xiashijie Coal Mine with Soft, Swelling Floor Rock
    2017
    Co-Authors: Wang Xingkai, Wenbing Xie, Shengguo Jing, Jianbiao Bai
    Abstract:

    Serious damage caused by floor heave in the Coal given chamber of a vertical Coal Bunker is one of the challenges faced in underground Coal mines. Engineering practice shows that it is more difficult to maintain the Coal given chamber (CGC) than a roadway. More importantly, repairing the CGC during mining practice will pose major safety risks and reduce production. Based on the case of the serious collapse that occurred in the bearing structure of the CGC at the lower part of the 214# Coal Bunker in Xiashijie mine, China, this work analysed (i) the main factors influencing floor heave and (ii) the failure mechanism of the load-bearing structure in the CGC using FLAC2D numerical models and expansion experiment. The analysis results indicate that: the floor heave, caused mainly by mine water, is the basic reason leading to the instability and repeated failure of the CGC in the 214# Coal Bunker. Then a new Coal Bunker, without building the CGC, is proposed and put into practice to replace the 214# Coal Bunker. The FLAC3D software program is adopted to establish the numerical model of the wall-mounted Coal Bunker (WMCB), and the stability of the rock surrounding the WMCB is simulated and analysed. The results show that: (1) the rock surrounding the sandstone segment is basically stable. (2) The surrounding rock in the Coal seam segment, which moves into the inside of the Bunker, is the main zone of deformation for the entire rock mass surrounding the Bunker. Then the surrounding rock is controlled effectively by means of high-strength bolt–cable combined supporting technology. According to the geological conditions of the WMCB, the self-bearing system, which includes (i) H-steel beams, (ii) H-steel brackets, and (iii) self-locking anchor cables, is established and serves as a substitute for the CGC to transfer the whole weight of the Bunker to stable surrounding rock. The stability of the new Coal Bunker has been verified by field testing, and the Coal mine has gained economic benefit to a value of 158.026174 million RMB over three years. The new WMCB thus made production more effective and can provide helpful references for construction of vertical Bunkers under similar geological conditions.

Jianbiao Bai - One of the best experts on this subject based on the ideXlab platform.

  • Large-Deformation Failure Mechanism of Coal-Feeder Chamber and Construction of Wall-Mounted Coal Bunker in Underground Coal Mine with Soft, Swelling Floor Rocks
    Advances in Civil Engineering, 2019
    Co-Authors: Wang Xingkai, Wenbing Xie, Jianbiao Bai, Shengguo Jing
    Abstract:

    In traditional vertical Coal Bunker systems, a Coal-feeder chamber (CFC) must bear the whole weight of the Bunker. However, maintenance of CFCs within soft, swelling floor rock is a challenge faced in underground Coal mines. Floor-heave control is a complex problem and is still not well-solved. Moreover, there is no report on the construction of Bunker without a CFC, especially under such weak floor-rock conditions. Based on the serious CFC collapse case at Xiashijie mine, China, this work analyzed the deformation characteristics, main influencing factors, and failure mechanisms of the CFC using a FLAC numerical model. The results indicate that the intrusion of water weakens the strength of the floor rock and causes significant expansive forces; thus, large deformations and tensile failure occur first in the floor, further causing shearing and tensile damage of the reinforced column and even overall instability of the CFC. Then, a new wall-mounted Coal Bunker (WMCB), without building the CFC, is proposed. The FLAC3D program was adopted to study the stability of the rocks surrounding the new Bunker, and an optimized reinforcement scheme was determined. More importantly, a self-bearing system, which includes self-designed H-steel beams, H-steel brackets, and self-locking anchor cables, was proposed and constructed to bear the whole weight of the Bunker. The stability of WMCB was verified by a theoretical safety assessment and field test. The invented WMCB could remain stable in spite of severe floor heave. This work can provide helpful references for the construction of vertical Bunkers without CFCs in Coal mines with soft, swelling floor rocks.

  • A Case Study on Large Deformation Failure Mechanism of Coal given Chamber and Invention of a New Wall-Mounted Coal Bunker in Xiashijie Coal Mine with Soft, Swelling Floor Rock
    2017
    Co-Authors: Wang Xingkai, Wenbing Xie, Shengguo Jing, Jianbiao Bai
    Abstract:

    Serious damage caused by floor heave in the Coal given chamber of a vertical Coal Bunker is one of the challenges faced in underground Coal mines. Engineering practice shows that it is more difficult to maintain the Coal given chamber (CGC) than a roadway. More importantly, repairing the CGC during mining practice will pose major safety risks and reduce production. Based on the case of the serious collapse that occurred in the bearing structure of the CGC at the lower part of the 214# Coal Bunker in Xiashijie mine, China, this work analysed (i) the main factors influencing floor heave and (ii) the failure mechanism of the load-bearing structure in the CGC using FLAC2D numerical models and expansion experiment. The analysis results indicate that: the floor heave, caused mainly by mine water, is the basic reason leading to the instability and repeated failure of the CGC in the 214# Coal Bunker. Then a new Coal Bunker, without building the CGC, is proposed and put into practice to replace the 214# Coal Bunker. The FLAC3D software program is adopted to establish the numerical model of the wall-mounted Coal Bunker (WMCB), and the stability of the rock surrounding the WMCB is simulated and analysed. The results show that: (1) the rock surrounding the sandstone segment is basically stable. (2) The surrounding rock in the Coal seam segment, which moves into the inside of the Bunker, is the main zone of deformation for the entire rock mass surrounding the Bunker. Then the surrounding rock is controlled effectively by means of high-strength bolt–cable combined supporting technology. According to the geological conditions of the WMCB, the self-bearing system, which includes (i) H-steel beams, (ii) H-steel brackets, and (iii) self-locking anchor cables, is established and serves as a substitute for the CGC to transfer the whole weight of the Bunker to stable surrounding rock. The stability of the new Coal Bunker has been verified by field testing, and the Coal mine has gained economic benefit to a value of 158.026174 million RMB over three years. The new WMCB thus made production more effective and can provide helpful references for construction of vertical Bunkers under similar geological conditions.

Wang Xingkai - One of the best experts on this subject based on the ideXlab platform.

  • Large-Deformation Failure Mechanism of Coal-Feeder Chamber and Construction of Wall-Mounted Coal Bunker in Underground Coal Mine with Soft, Swelling Floor Rocks
    Advances in Civil Engineering, 2019
    Co-Authors: Wang Xingkai, Wenbing Xie, Jianbiao Bai, Shengguo Jing
    Abstract:

    In traditional vertical Coal Bunker systems, a Coal-feeder chamber (CFC) must bear the whole weight of the Bunker. However, maintenance of CFCs within soft, swelling floor rock is a challenge faced in underground Coal mines. Floor-heave control is a complex problem and is still not well-solved. Moreover, there is no report on the construction of Bunker without a CFC, especially under such weak floor-rock conditions. Based on the serious CFC collapse case at Xiashijie mine, China, this work analyzed the deformation characteristics, main influencing factors, and failure mechanisms of the CFC using a FLAC numerical model. The results indicate that the intrusion of water weakens the strength of the floor rock and causes significant expansive forces; thus, large deformations and tensile failure occur first in the floor, further causing shearing and tensile damage of the reinforced column and even overall instability of the CFC. Then, a new wall-mounted Coal Bunker (WMCB), without building the CFC, is proposed. The FLAC3D program was adopted to study the stability of the rocks surrounding the new Bunker, and an optimized reinforcement scheme was determined. More importantly, a self-bearing system, which includes self-designed H-steel beams, H-steel brackets, and self-locking anchor cables, was proposed and constructed to bear the whole weight of the Bunker. The stability of WMCB was verified by a theoretical safety assessment and field test. The invented WMCB could remain stable in spite of severe floor heave. This work can provide helpful references for the construction of vertical Bunkers without CFCs in Coal mines with soft, swelling floor rocks.

  • A Case Study on Large Deformation Failure Mechanism of Coal given Chamber and Invention of a New Wall-Mounted Coal Bunker in Xiashijie Coal Mine with Soft, Swelling Floor Rock
    2017
    Co-Authors: Wang Xingkai, Wenbing Xie, Shengguo Jing, Jianbiao Bai
    Abstract:

    Serious damage caused by floor heave in the Coal given chamber of a vertical Coal Bunker is one of the challenges faced in underground Coal mines. Engineering practice shows that it is more difficult to maintain the Coal given chamber (CGC) than a roadway. More importantly, repairing the CGC during mining practice will pose major safety risks and reduce production. Based on the case of the serious collapse that occurred in the bearing structure of the CGC at the lower part of the 214# Coal Bunker in Xiashijie mine, China, this work analysed (i) the main factors influencing floor heave and (ii) the failure mechanism of the load-bearing structure in the CGC using FLAC2D numerical models and expansion experiment. The analysis results indicate that: the floor heave, caused mainly by mine water, is the basic reason leading to the instability and repeated failure of the CGC in the 214# Coal Bunker. Then a new Coal Bunker, without building the CGC, is proposed and put into practice to replace the 214# Coal Bunker. The FLAC3D software program is adopted to establish the numerical model of the wall-mounted Coal Bunker (WMCB), and the stability of the rock surrounding the WMCB is simulated and analysed. The results show that: (1) the rock surrounding the sandstone segment is basically stable. (2) The surrounding rock in the Coal seam segment, which moves into the inside of the Bunker, is the main zone of deformation for the entire rock mass surrounding the Bunker. Then the surrounding rock is controlled effectively by means of high-strength bolt–cable combined supporting technology. According to the geological conditions of the WMCB, the self-bearing system, which includes (i) H-steel beams, (ii) H-steel brackets, and (iii) self-locking anchor cables, is established and serves as a substitute for the CGC to transfer the whole weight of the Bunker to stable surrounding rock. The stability of the new Coal Bunker has been verified by field testing, and the Coal mine has gained economic benefit to a value of 158.026174 million RMB over three years. The new WMCB thus made production more effective and can provide helpful references for construction of vertical Bunkers under similar geological conditions.

Wenbing Xie - One of the best experts on this subject based on the ideXlab platform.

  • Large-Deformation Failure Mechanism of Coal-Feeder Chamber and Construction of Wall-Mounted Coal Bunker in Underground Coal Mine with Soft, Swelling Floor Rocks
    Advances in Civil Engineering, 2019
    Co-Authors: Wang Xingkai, Wenbing Xie, Jianbiao Bai, Shengguo Jing
    Abstract:

    In traditional vertical Coal Bunker systems, a Coal-feeder chamber (CFC) must bear the whole weight of the Bunker. However, maintenance of CFCs within soft, swelling floor rock is a challenge faced in underground Coal mines. Floor-heave control is a complex problem and is still not well-solved. Moreover, there is no report on the construction of Bunker without a CFC, especially under such weak floor-rock conditions. Based on the serious CFC collapse case at Xiashijie mine, China, this work analyzed the deformation characteristics, main influencing factors, and failure mechanisms of the CFC using a FLAC numerical model. The results indicate that the intrusion of water weakens the strength of the floor rock and causes significant expansive forces; thus, large deformations and tensile failure occur first in the floor, further causing shearing and tensile damage of the reinforced column and even overall instability of the CFC. Then, a new wall-mounted Coal Bunker (WMCB), without building the CFC, is proposed. The FLAC3D program was adopted to study the stability of the rocks surrounding the new Bunker, and an optimized reinforcement scheme was determined. More importantly, a self-bearing system, which includes self-designed H-steel beams, H-steel brackets, and self-locking anchor cables, was proposed and constructed to bear the whole weight of the Bunker. The stability of WMCB was verified by a theoretical safety assessment and field test. The invented WMCB could remain stable in spite of severe floor heave. This work can provide helpful references for the construction of vertical Bunkers without CFCs in Coal mines with soft, swelling floor rocks.

  • A Case Study on Large Deformation Failure Mechanism of Coal given Chamber and Invention of a New Wall-Mounted Coal Bunker in Xiashijie Coal Mine with Soft, Swelling Floor Rock
    2017
    Co-Authors: Wang Xingkai, Wenbing Xie, Shengguo Jing, Jianbiao Bai
    Abstract:

    Serious damage caused by floor heave in the Coal given chamber of a vertical Coal Bunker is one of the challenges faced in underground Coal mines. Engineering practice shows that it is more difficult to maintain the Coal given chamber (CGC) than a roadway. More importantly, repairing the CGC during mining practice will pose major safety risks and reduce production. Based on the case of the serious collapse that occurred in the bearing structure of the CGC at the lower part of the 214# Coal Bunker in Xiashijie mine, China, this work analysed (i) the main factors influencing floor heave and (ii) the failure mechanism of the load-bearing structure in the CGC using FLAC2D numerical models and expansion experiment. The analysis results indicate that: the floor heave, caused mainly by mine water, is the basic reason leading to the instability and repeated failure of the CGC in the 214# Coal Bunker. Then a new Coal Bunker, without building the CGC, is proposed and put into practice to replace the 214# Coal Bunker. The FLAC3D software program is adopted to establish the numerical model of the wall-mounted Coal Bunker (WMCB), and the stability of the rock surrounding the WMCB is simulated and analysed. The results show that: (1) the rock surrounding the sandstone segment is basically stable. (2) The surrounding rock in the Coal seam segment, which moves into the inside of the Bunker, is the main zone of deformation for the entire rock mass surrounding the Bunker. Then the surrounding rock is controlled effectively by means of high-strength bolt–cable combined supporting technology. According to the geological conditions of the WMCB, the self-bearing system, which includes (i) H-steel beams, (ii) H-steel brackets, and (iii) self-locking anchor cables, is established and serves as a substitute for the CGC to transfer the whole weight of the Bunker to stable surrounding rock. The stability of the new Coal Bunker has been verified by field testing, and the Coal mine has gained economic benefit to a value of 158.026174 million RMB over three years. The new WMCB thus made production more effective and can provide helpful references for construction of vertical Bunkers under similar geological conditions.

Ye Bing-sheng - One of the best experts on this subject based on the ideXlab platform.