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Full-mechanized caving mining technology of extremely thick and hard coal-seam with hard roof in shallow

Zhang Zhongwen,Wu Jinan

Strategic Study of CAE 2011, Volume 13, Issue 11,   Pages 107-112

Abstract:

Top-coal caving difficulty degree and rational mining method were analyzedby theoretical method on the basis of the 4th coal-seam condition of Pingshuo Mining area.For improving top-coal caving degree, the parameters of full-mechanized caving mining face were obtainedrecovery ratio would be realized by lengthening mining face and adding mining height in shallow buried hardcoal-seam with hard roof.

Keywords： shallow buried depth     hard coal-seam with hard roof     top-coal caving difficulty degree     full-mechanized    

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Engineering Experiment Research of the Quantity Theoretical Orthogonal Design Optimal Method for the Coal-seam

Qin Shuyu,Qin Weihan

Strategic Study of CAE 2003, Volume 5, Issue 10,   Pages 52-55

Abstract:

To apply the orthogonal design to the optimization of the coal-seam injection technical parameters' combination is a better method that realizes the best effect of injection for the coal-seam withwith this method, its effect cannot definitely satisfy the injection engineering requirement for the coal-seamFor this reason, in view of the coal-seam with unsteady geological factors and the characteristic that

Keywords： quantity theory     technical parameter     orthogonal design     coal-seam injection     experimental study    

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Technology of Coal-Rock Mass Hydraulic Fracture Weakeningand Its Development

Huang Bingxiang,Deng Guangzhe,Liu Changyou

Strategic Study of CAE 2007, Volume 9, Issue 4,   Pages 83-88

Abstract:

Technologic problems of top coal recovery ratio, rock burst, coal spontaneouscombustion and gas accumulation induced by hard top-coal or roof's fall in coal mining were introducedCurrent research and development trend of hydraulic fracture weakening for hard top-coal or roof was

Keywords： hard top-coal(roof)     hydraulic fracture     crack expanding     mescoscopic structure    

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Analysis of load and adaptability of disc cutters during shield tunneling in soft–hard varied strata

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 533-545 doi: 10.1007/s11709-023-0946-1

Abstract: disc cutters of shield machines exhibit unsatisfactory adaptability and performance during the soft–hardrotation state, cutting performance, and adaptability of disc cutters during shield tunneling in soft–hard

Keywords： shield tunneling     disc cutter load     laboratory excavation test     numerical calculation     soft–hard varied    

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Advances in molecular dynamics simulation of ultra-precision machining of hard and brittle materials

Xiaoguang GUO,Qiang LI,Tao LIU,Renke KANG,Zhuji JIN,Dongming GUO

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 1,   Pages 89-98 doi: 10.1007/s11465-017-0412-7

Abstract:

Hard and brittle materials, such as silicon, SiC, and optical glasses, are widely used in aerospaceHowever, these materials display poor machinability because of their hard and brittle properties.Damages such as surface micro-crack and subsurface damage often occur during machining of hard and brittleUltra-precision machining is widely used in processing hard and brittle materials to obtain nanoscaleprovides a review of present research on the molecular dynamics simulation of ultra-precision machining of hard

Keywords： MD simulation     ultra-precision machining     hard and brittle materials     machining mechanism     review    

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Primary cilia in hard tissue development and diseases

Frontiers of Medicine 2021, Volume 15, Issue 5,   Pages 657-678 doi: 10.1007/s11684-021-0829-6

Abstract: Bone and teeth are hard tissues.Hard tissue diseases have a serious effect on human survival and quality of life.mutations present overt changes in the skeletal system, suggesting that primary cilia are involved in hardIn addition, the cilium-related diseases of hard tissue and the manifestations of mutant cilia in theWe believe that all the findings will help with the intervention and treatment of related hard tissue

Keywords： primary cilia     bone     mechanical sensing     hard tissue     cilium-related bone disease     tooth    

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Crystalline mesoporous transition metal oxides: hard-templating synthesis and application in environmental

Zhen MA, Bei ZHOU, Yu REN

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 3,   Pages 341-355 doi: 10.1007/s11783-012-0472-1

Abstract: Mesoporous metal oxides can be synthesized via a soft-templating or hard-templating approach, and thesereview, we summarize the synthesis of mesoporous transition metal oxides using mesoporous silicas as hard

Keywords： mesoporous materials     silica     metal oxide     hard-templating     environmental catalysis    

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Field and laboratory experimental studies on hard-rock tunnel excavation based on disc cutter coupled

Frontiers of Structural and Civil Engineering   Pages 1370-1386 doi: 10.1007/s11709-023-0947-0

Abstract: The tunnel boring machine (TBM) is typically used in hard-rock tunnel excavation.nozzle diameter, and nozzle speed on cutting are investigated via laboratory experiments of cutting hard

Keywords： tunnel boring machine     hard-rock cutting     free face     disc cutter     rock-cutting efficiency    

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Improved CO

Mahboube Ghahramaninezhad, Fatemeh Mohajer, Mahdi Niknam Shahrak

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 3,   Pages 425-435 doi: 10.1007/s11705-019-1873-5

Abstract: capturing was developed via functionalization of zeolitic imidazolate framework-91 (ZIF-91) to generate a hard/hard (metal-oxygen) structure named as lithium-modified ZIF-91 (ZIF-91-OLi compound).

Keywords： hard/hard structure     acidic hydrogen     ZIF-91     carbon capture     ZIF-91-OLi    

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Microstructure investigation of dynamic recrystallization in hard machining: From thermodynamic irreversibility

Binxun LI, Xinzhi ZHANG, Song ZHANG

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 2,   Pages 315-330 doi: 10.1007/s11465-020-0612-4

Abstract: drastically changed thermal, mechanical, and chemical energies within the machined surface layer during hard

Keywords： thermodynamic irreversibility     Helmholtz free energy     microstructure evolution     dynamic recrystallization     hard    

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Effect of magneto rheological damper on tool vibration during hard turning

P. Sam PAUL, A. S. VARADARAJAN

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 4,   Pages 410-416 doi: 10.1007/s11465-012-0341-4

Abstract:

Recently, the concept of hard turning has gained considerable attention in metal cutting as it canreplace the traditional process cycle of turning, heat treating, and finish grinding for assembly of hardrheological (MR) fluid damper for suppressing tool vibration and promoting better cutting performance during hardcutting performance during turning of AISI 4340 steel of 46 HRC with minimal fluid application using hard

Keywords： tool vibration     magneto rheological damper     hard turning     surface finish     tool wear    

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Crack evolution of soft–hard composite layered rock-like specimens with two fissures under uniaxial compression

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1372-1389 doi: 10.1007/s11709-021-0772-2

Abstract: correlation were used to study the spatiotemporal evolution characteristics of crack extension of soft and hardHard layers predominantly produce tensile cracks; soft layers produce shear cracks.The first crack always sprouts at the tip or middle of prefabricated fractures in hard layers.

Keywords： soft−hard composite layered rock mass     double cracks     crack evolution     acoustic emission     digital image    

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Study on Coal Seam Roof Gas Drainage from the Strike of Annular Fracture Areas by the Long Drill Method

Liu Zegong,Yuan Liang,Dai Guanglong,Shi Biming,Lu Ping,Tu Min

Strategic Study of CAE 2004, Volume 6, Issue 5,   Pages 32-38

Abstract:

Gas in working faces is mainly produced in the destressing and desorption process of the coal bed,The coal beds are too soft to carry out bedding drilling and draw gas effectively.Mining in coal beds with gas of high conentration and low permeability and gas suction can be operatodDuring mining activities in the working faces,gas released from roof fracture areas will not flow intoupper corners, so the technically drilling problem in soft coal beds with low permeability and high

Keywords： coal seam     similar material experiment     numerical simulation     gas drainage     annular fracture area    

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Realtime prediction of hard rock TBM advance rate using temporal convolutional network (TCN) with tunnel

Zaobao LIU; Yongchen WANG; Long LI; Xingli FANG; Junze WANG

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 4,   Pages 401-413 doi: 10.1007/s11709-022-0823-3

Abstract: Real-time dynamic adjustment of the tunnel bore machine (TBM) advance rate according to the rock-machine interaction parameters is of great significance to the adaptability of TBM and its efficiency in construction. This paper proposes a real-time predictive model of TBM advance rate using the temporal convolutional network (TCN), based on TBM construction big data. The prediction model was built using an experimental database, containing 235 data sets, established from the construction data from the Jilin Water-Diversion Tunnel Project in China. The TBM operating parameters, including total thrust, cutterhead rotation, cutterhead torque and penetration rate, are selected as the input parameters of the model. The TCN model is found outperforming the recurrent neural network (RNN) and long short-term memory (LSTM) model in predicting the TBM advance rate with much smaller values of mean absolute percentage error than the latter two. The penetration rate and cutterhead torque of the current moment have significant influence on the TBM advance rate of the next moment. On the contrary, the influence of the cutterhead rotation and total thrust is moderate. The work provides a new concept of real-time prediction of the TBM performance for highly efficient tunnel construction.

Keywords： hard rock tunnel     tunnel bore machine advance rate prediction     temporal convolutional networks     soft    

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Numerical Simulation Research of Air Organization in Air Conditioned Hard-sleeper Compartment

Zhang Dengchun

Strategic Study of CAE 2004, Volume 6, Issue 9,   Pages 66-72

Abstract: By k-ε turbulence model, the air fluid flow and heat transfer in air-conditioned hard-sleeper

Keywords： hard-sleeper compartment     turbulence model     air organization     numerical simulation    

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Title Author Date Type Operation

Full-mechanized caving mining technology of extremely thick and hard coal-seam with hard roof in shallow

Zhang Zhongwen,Wu Jinan

Journal Article

Engineering Experiment Research of the Quantity Theoretical Orthogonal Design Optimal Method for the Coal-seam

Qin Shuyu,Qin Weihan

Journal Article

Technology of Coal-Rock Mass Hydraulic Fracture Weakeningand Its Development

Huang Bingxiang,Deng Guangzhe,Liu Changyou

Journal Article

Analysis of load and adaptability of disc cutters during shield tunneling in soft–hard varied strata

Journal Article

Advances in molecular dynamics simulation of ultra-precision machining of hard and brittle materials

Xiaoguang GUO,Qiang LI,Tao LIU,Renke KANG,Zhuji JIN,Dongming GUO

Journal Article

Primary cilia in hard tissue development and diseases

Journal Article

Crystalline mesoporous transition metal oxides: hard-templating synthesis and application in environmental

Zhen MA, Bei ZHOU, Yu REN

Journal Article

Field and laboratory experimental studies on hard-rock tunnel excavation based on disc cutter coupled

Journal Article

Improved CO

Mahboube Ghahramaninezhad, Fatemeh Mohajer, Mahdi Niknam Shahrak

Journal Article

Microstructure investigation of dynamic recrystallization in hard machining: From thermodynamic irreversibility

Binxun LI, Xinzhi ZHANG, Song ZHANG

Journal Article

Effect of magneto rheological damper on tool vibration during hard turning

P. Sam PAUL, A. S. VARADARAJAN

Journal Article

Crack evolution of soft–hard composite layered rock-like specimens with two fissures under uniaxial compression

Journal Article

Study on Coal Seam Roof Gas Drainage from the Strike of Annular Fracture Areas by the Long Drill Method

Liu Zegong,Yuan Liang,Dai Guanglong,Shi Biming,Lu Ping,Tu Min

Journal Article

Realtime prediction of hard rock TBM advance rate using temporal convolutional network (TCN) with tunnel

Zaobao LIU; Yongchen WANG; Long LI; Xingli FANG; Junze WANG

Journal Article

Numerical Simulation Research of Air Organization in Air Conditioned Hard-sleeper Compartment

Zhang Dengchun

Journal Article