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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.Owing to the unsatisfactory adaptability of TBM to the surrounding rock, when crossing high-strengthTherefore, high-pressure waterjet technology should be applied to assist in rock breaking for efficientnozzle diameter, and nozzle speed on cutting are investigated via laboratory experiments of cutting hardrock using high-pressure waterjets.

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

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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 hardcomposite laminated rock masses (SHCLRM) containing double fissures under uniaxial compression.The effects of different rock combination methods and prefabricated fissures with different orientationsHard 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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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: recovery 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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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

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

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Working Procedure of Developing a New Deep Hard-rock Burst-prone Deposit

Guo Ran,Yu Runcang

Strategic Study of CAE 2002, Volume 4, Issue 7,   Pages 51-55

Abstract: In this paper, the authors create a general working procedure to develop a new hard-rock burst-proneinto 6 steps： initial determination of burst tendency; study of the proneness to rockburst of typical rocksamples ;in-situ rock stress measurement; possibility of strain burst in the mine; principles in theThe above study results lays a theoretical foundation for applied research of deep hard-rock burst-prone

Keywords： rockburst     mining technique     working procedure    

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Ribbed strip rolling by three-dimensional finite element method combining extremely thin array of elements

Zhengyi JIANG,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 1,   Pages 52-60 doi: 10.1007/s11465-009-0087-9

Abstract: three-dimensional finite element modelling of the ribbed strip rolling is carried out, coupling the use of an extremely

Keywords： rib inclined contact boundary condition     ribbed strip     extremely thin elements     pulling down of rib height    

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The Practice of Forward Prospecting of Adverse Geology Applied to Hard Rock TBM Tunnel Construction: Article

Shucai Li, Lichao Nie, Bin Liu

Engineering 2018, Volume 4, Issue 1,   Pages 131-137 doi: 10.1016/j.eng.2017.12.010

Abstract:

An increasing number of tunnels are being constructed with tunnel-boring machines (TBMs) due to the increased efficiency and shorter completion time resulting from their use. However, when a TBM encounters adverse geological conditions in the course of tunnel construction (e.g., karst caves, faults, or fractured zones), disasters such as water and mud inrush, collapse, or machine blockage may result, and may severely imperil construction safety. Therefore, the advance detection of adverse geology and water-bearing conditions in front of the tunnel face is of great importance. This paper uses the TBM tunneling of the water conveyance project from Songhua River as a case study in order to propose a comprehensive forward geological prospecting technical system that is suitable for TBM tunnel construction under complicated geological conditions. By combining geological analysis with forward geological prospecting using a three-dimensional (3D) induced polarization method and a 3D seismic method, a comprehensive forward geological prospecting technical system can accurately forecast water inrush geo-hazards or faults in front of the TBM tunnel face. In this way, disasters such as water and mud inrush, collapse, or machine blockage can be avoided. This prospecting technical system also has reference value for carrying out the forward prospecting of adverse geology for potential TBM tunneling and for ensuring that a TBM can work efficiently.

Keywords： Hard rock TBM tunnels     Comprehensive forward prospecting     Geological analysis     3D induced polarization     3D    

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Frontiers in Personless Mining and Avenues of Their Advancement in China

Li Zhongxue,Li Cuiping,Liu Shuangyue

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 16-20

Abstract:

With the rapid social and economic development in China,  technology innovations in the extraction and utilization of mineral resources are demanded to address the problems associated with larger mining depth and other adverse conditions confronted by the mining industries,  increase the efficiency of extracting mineral resources,  and safeguard the safety and health of mining workers.  To this end,  the Chinese Ministry of Science and Technology (MOST) has launched a series of research directions through the 863 Program aimed at frontiers in the subject of personless mining to enhance technology innovations in personless mining and provide the mining industries with a fresh perspective to personless mining.  In response to the MOST initiative,  this paper presents a brief review on the development of automated mining technologies in the industrialized nations such as Canada,  Australia,  Finland and Sweden,  outlines the major technological issues on the frontiers of automated mining,  and proposes some avenues of advancing technology innovations in automated mining in China.

Keywords： hard-rock mining     automated mining     personless mining     personless mine    

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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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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 wasanalyzed, including the law of crack expanding induced by hydraulic fracture in rock mass, mescoscopicstructure alteration of cracked rock mass by seepage pressure and its macroscopic mechanics response

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

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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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A Closer Look at the Design of Cutterheads for Hard Rock Tunnel-Boring Machines

Jamal Rostami, Soo-Ho Chang

Engineering 2017, Volume 3, Issue 6,   Pages 892-904 doi: 10.1016/j.eng.2017.12.009

Abstract: proprietary algorithms by the manufacturers, and despite recent attention on the subject, the design of rock

Keywords： TBM cutterhead design     Cutterhead layout     Disk cutters     Cutting pattern     TBM efficiency    

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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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Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremely

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 446-472 doi: 10.1007/s11709-019-0605-8

Abstract: The main purpose of the present study is to enhance high-level noisy data by a wavelet-based iterative filtering algorithm for identification of natural frequencies during ambient wind vibrational tests on a petrochemical process tower. Most of denoising methods fail to filter such noise properly. Both the signal-to-noise ratio and the peak signal-to-noise ratio are small. Multiresolution-based one-step and variational-based filtering methods fail to denoise properly with thresholds obtained by theoretical or empirical method. Due to the fact that it is impossible to completely denoise such high-level noisy data, the enhancing approach is used to improve the data quality, which is the main novelty from the application point of view here. For this iterative method, a simple computational approach is proposed to estimate the dynamic threshold values. Hence, different thresholds can be obtained for different recorded signals in one ambient test. This is in contrast to commonly used approaches recommending one global threshold estimated mainly by an empirical method. After the enhancements, modal frequencies are directly detected by the cross wavelet transform (XWT), the spectral power density and autocorrelation of wavelet coefficients. Estimated frequencies are then compared with those of an undamaged-model, simulated by the finite element method.

Keywords： ambient vibration test     high level noise     iterative signal enhancement     wavelet     cross and autocorrelation of wavelets    

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Title Author Date Type Operation

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

Journal Article

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

Journal Article

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

Zhang Zhongwen,Wu Jinan

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

Working Procedure of Developing a New Deep Hard-rock Burst-prone Deposit

Guo Ran,Yu Runcang

Journal Article

Ribbed strip rolling by three-dimensional finite element method combining extremely thin array of elements

Zhengyi JIANG,

Journal Article

The Practice of Forward Prospecting of Adverse Geology Applied to Hard Rock TBM Tunnel Construction:

Shucai Li, Lichao Nie, Bin Liu

Journal Article

Frontiers in Personless Mining and Avenues of Their Advancement in China

Li Zhongxue,Li Cuiping,Liu Shuangyue

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

Technology of Coal-Rock Mass Hydraulic Fracture Weakeningand Its Development

Huang Bingxiang,Deng Guangzhe,Liu Changyou

Journal Article

Primary cilia in hard tissue development and diseases

Journal Article

A Closer Look at the Design of Cutterheads for Hard Rock Tunnel-Boring Machines

Jamal Rostami, Soo-Ho Chang

Journal Article

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

Zhen MA, Bei ZHOU, Yu REN

Journal Article

Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremely

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI

Journal Article