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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: image correlation were used to study the spatiotemporal evolution characteristics of crack extension of softand hard composite laminated rock masses (SHCLRM) containing double fissures under uniaxial compressionThe 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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Performance of soft-hard-soft (SHS) cement based composite subjected to blast loading with consideration

Jun WU,Xuemei LIU

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 3,   Pages 323-340 doi: 10.1007/s11709-015-0301-2

Abstract: This paper presents a combined experimental and numerical study on the damage and performance of a soft-hard-soft(SHS) multi-layer cement based composite subjected to blast loading which can be used for protectivestructures and infrastructures to resist extreme loadings, and the composite consists of three layersTo better characterize the material properties under dynamic loading, interface properties of the compositeA full-scale field blast test investigated the blast behavior of the composite materials.

Keywords： high strength concrete (SHS)     engineered cementitious composite     interface     blast test     strain rate effect    

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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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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: The disc cutters of shield machines exhibit unsatisfactory adaptability and performance during the soft–hardthe rotation state, cutting performance, and adaptability of disc cutters during shield tunneling in soft–hardThe tangential loads of the disc cutters during the cutting of four typical soft-strata excavation faceA greater penetration is suggested for soft-strata tunneling to allow the disc cutters to rotate smoothly

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

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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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Shaking table testing of hard layered soil-pile-structure interaction system

LI Peizhen, REN Hongmei, LU Xilin, SONG Heping, CHEN Yueqing

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 346-352 doi: 10.1007/s11709-007-0046-7

Abstract: Shaking table tests on a dynamic interaction system of hard layered soil, pile foundation and frame structure

Keywords： super-structure     Generally     Magnification     frequency     different    

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Influence of soft rock-fill material as dam embankment with central bituminous concrete membrane

Peter TSCHERNUTTER

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 1,   Pages 63-70 doi: 10.1007/s11709-010-0016-3

Abstract: Laboratory as well as field tests on solid rock-fill material were performed before the beginning ofDuring the construction the properties of the available rock-fill changed from solid to soft materials

Keywords： embankment dam     bituminous concrete membrane     rock-fill material properties     deformation behavior    

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Simulation of blast induced crater in jointed rock mass by discontinuous deformation analysis method

Youjun NING, Xinmei AN, Jun YANG, Guowei MA,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 2,   Pages 223-232 doi: 10.1007/s11709-010-0022-5

Abstract: Rock blasting is a dynamic process accompanied with the propagations of shock waves and the dispersionThis paper adopts the discontinuous deformation analysis (DDA) method to simulate the rock blasting processThe blasting process in jointed rock mass is simulated by application of the explosion gas pressure onThe whole process including the explosion gas dispersion, borehole expansion, rock mass failure and cast, and the formation of the final blasting piles in rock blasting are well reproduced numerically.

Keywords： blast crater     jointed rock mass     explosion gas pressure     discontinuous deformation analysis (DDA) method    

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Compared and analyzed the petrology and geochemistry of felsic rock mass enriches rare and non-ferrous

Wang Zixi,Ling Jinlan and Song Yanfang

Strategic Study of CAE 2015, Volume 17, Issue 2,   Pages 50-58

Abstract:

The felsic rock mass always enrich Cu，Mo，W，Sn，Nb，Ta ，then become an rare and non-ferrous metals deposit.MostHigh SiO2， K2O， K2O/Na2O are benefit of enriching Mo in the magma which rock mass enriches Cu， Mo；highTiO2 and low P2O5 are benefit of enriching in the magma which rock mass enrich Nb， Ta.The enriching Cu of rock mass is S type granite，but the enriching Mo of rock mass is transiting fromrock mass has A type， I type and S type granites.

Keywords： felsic rock mass；rare metal；non-ferrous metal；formation of rock；small rock mass    

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Clogging of slurry-shield tunnel-boring machine drives in sedimentary soft rock: A case study

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0984-8

Abstract: This paper presents a case study of the clogging of a slurry-shield tunnel-boring machine (TBM) experienced during tunnel operations in clay-rich argillaceous siltstones under the Ganjiang River, China. The clogging experienced during tunneling was due to special geological conditions, which had a considerably negative impact on the slurry-shield TBM tunneling performance. In this case study, the effect of clogging on the slurry-shield TBM tunneling performance (e.g., advance speed, thrust, torque, and penetration per revolution) was fully investigated. The potential for clogging during tunnel operations in argillaceous siltstone was estimated using an existing empirical classification chart. Many improvement measures have been proposed to mitigate the clogging potential of two slurry-shield TBMs during tunneling, such as the use of an optimum cutting wheel, a replacement cutting tool, improvements to the circulation flushing system and slurry properties, mixed support integrating slurry, and compressed air to support the excavation face. The mechanisms and potential causes of clogging are explained in detail, and the contributions of these mitigation measures to tunneling performance are discussed. By investigating the actual operational parameters of the slurry-shield TBMs, these mitigation measures were proven to be effective in mitigating the clogging potential of slurry-shield TBMs. This case study provides valuable information for slurry-shield TBMs involving tunneling in clay-rich sedimentary rocks.

Keywords： slurry-shield TBM     geological investigation     clogging     argillaceous siltstone     TBM performance     mitigation measures    

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Research on the influence of contact surface constraint on mechanical properties of rock-concrete composite

Baoyun ZHAO, Yang LIU, Dongyan LIU, Wei HUANG, Xiaoping WANG, Guibao YU, Shu LIU

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 322-330 doi: 10.1007/s11709-019-0594-7

Abstract: To study the influence of contact surface on the mechanical properties of rock-concrete composite specimensunder compressive loads, the two different contact forms of rock-concrete composite specimens are designedThe influence of contact surface constraint on the mechanical properties of rock-concrete composite specimensResults show that the stress and strain of rock-concrete composite specimens with contact surface constraintcomposite specimens, which explains the difference of mechanical properties between the two rock-concrete

Keywords： rock-concrete     composite specimen     contact surface     mechanical properties     failure mechanism    

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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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Basic problems for dynamic deformation and fracture of deep rock mass

Li Jie,Wang Mingyang,Zhang Ning,Fan Pengxian

Strategic Study of CAE 2013, Volume 15, Issue 5,   Pages 71-79

Abstract:

Research on nonlinear mechanical behavior for deep rock mass has becomeThe difficulty lies in how to describe the rock mass properties in large dynamic deformation and failureThe test reviews the research results for failure mechanism of deep rock mass, basic problems in dynamicAnd it shows that: The problems of deep rock mass are in four dimensional spaces, it is the evolutionTo study on the deformation and failure mechanism of deep rock mass, the concept of time and space must

Keywords： deep rock mass     dynamic fracture     time effect     damage fracture     rock burst     zonal disintegration    

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Technical Methods to Make Safety Monitoring and Forecast Models for the Foundation of Long Suspension Bridges

Chen Zhijian,Zhou Shizhong ,Zhuo Jiashou

Strategic Study of CAE 2002, Volume 4, Issue 6,   Pages 20-24

Abstract: of stability problem and the importance and technical difficulty to make safety monitoring model for layeredsafety based on external deformation observation results and the forecast model for the stability of layered

Keywords： layered rock mass     slope     monitoring and forecast model     technical methods    

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A multiscale material model for heterogeneous liquid droplets in solid soft composites

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1292-1299 doi: 10.1007/s11709-021-0771-3

Abstract: Liquid droplets in solid soft composites have been attracting increasing attention in biological applicationsThis research revisits the available models for liquid droplets in solid soft composites and presentsand show that the model can precisely predict the effective properties of liquid droplets in solid soft

Keywords： liquid in solid     soft composite     computational modeling     multiscale model     heterogeneity    

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Title Author Date Type Operation

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

Journal Article

Performance of soft-hard-soft (SHS) cement based composite subjected to blast loading with consideration

Jun WU,Xuemei LIU

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

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

Journal Article

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

Journal Article

Shaking table testing of hard layered soil-pile-structure interaction system

LI Peizhen, REN Hongmei, LU Xilin, SONG Heping, CHEN Yueqing

Journal Article

Influence of soft rock-fill material as dam embankment with central bituminous concrete membrane

Peter TSCHERNUTTER

Journal Article

Simulation of blast induced crater in jointed rock mass by discontinuous deformation analysis method

Youjun NING, Xinmei AN, Jun YANG, Guowei MA,

Journal Article

Compared and analyzed the petrology and geochemistry of felsic rock mass enriches rare and non-ferrous

Wang Zixi,Ling Jinlan and Song Yanfang

Journal Article

Clogging of slurry-shield tunnel-boring machine drives in sedimentary soft rock: A case study

Journal Article

Research on the influence of contact surface constraint on mechanical properties of rock-concrete composite

Baoyun ZHAO, Yang LIU, Dongyan LIU, Wei HUANG, Xiaoping WANG, Guibao YU, Shu LIU

Journal Article

Technology of Coal-Rock Mass Hydraulic Fracture Weakeningand Its Development

Huang Bingxiang,Deng Guangzhe,Liu Changyou

Journal Article

Basic problems for dynamic deformation and fracture of deep rock mass

Li Jie,Wang Mingyang,Zhang Ning,Fan Pengxian

Journal Article

Technical Methods to Make Safety Monitoring and Forecast Models for the Foundation of Long Suspension Bridges

Chen Zhijian,Zhou Shizhong ,Zhuo Jiashou

Journal Article

A multiscale material model for heterogeneous liquid droplets in solid soft composites

Journal Article