Analysis on the Evolution of Rock Block Behavior During TBM Tunneling Considering the TBM–Block Interaction

Zhang, Zixin; Wang, Shuaifeng; Huang, Xin

doi:10.1007/s00603-018-1456-7

Cited by 23 publications

(6 citation statements)

References 46 publications

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“…Contrast with knife picks, the conical picks have long service life, and also have simple and reliable installation, therefore it is more widely used in modern coal mining machine drum. In the process of producing shearer, install the picks reasonably can improve the pick cutting performance, but also can extend the service life of picks.For example, when install the picks, thepick body should be the acute angle with shearer drum radial direction, basic at the tangent line of pick tip movement locus, thus the pick body under the influence of bending moment is small, then it is not easy to broken the picks [27][28].…”

Section: Coal Seam With Coal and Rock Interface Single Pick Cutting Mechanics Modelmentioning

confidence: 99%

Cutting Mechanical Study of Pick Cutting Coal Seams with Coal and Rock Interface

Luo

Qaio

2021

Preprint

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Shearer provide an effect solution for mining coal, and the cutting performance of pick largely accouts for the ability of a shearer and mining performance. We conducted pick cutting coal experiments in different seam forms on the coal and rock cutting teasted. According to the rotary cutting mechanical model of single pick cutting coal seam, combined with the strength condition of coal seam and coal-rock interface, the rotary cutting mechanical model of pick cutting coal seam with coal-rock interface is established. The stress strain and strength condition of the area in and around the interface are analyzed based on the coal-rock interface crushing theory, which provides basis for further research on the cutting mechanical model of single pick crossing the coal-rock interface. According to the analysis on the ampulitude domain, the phenomenon that force increment between the pick cutting rock and uniform coal seam linearly increases with the increase of compressive strength difference between coal seam and coal-rock interface, and the load fluctuation keep a positive correlation with the compressive strength. Analysis on the signals of the pick cutting coal seam with coal and rock interface at different conditions shows that some basic properties of the cutting load changes over times. In addition, the coal seam with coal-rock interface appears larger impact load and other time-domain characteristics.

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Section: Coal Seam With Coal and Rock Interface Single Pick Cutting Mechanics Modelmentioning

confidence: 99%

Cutting Mechanical Study of Pick Cutting Coal Seams with Coal and Rock Interface

Luo

Qaio

2021

Preprint

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“…Wang [3] believed that the characteristic energy factor was closely related to the characteristic scientific phenomena of deep rock mass in essence. Zhang et al [4] extended the traditional block theory to analyze the life-cycle behavioristics (morphology, mechanics, kinematics and stability) of rock blocks during TBM (tunnel-boring machine) tunneling through TBM-block interaction consideration. Zareifard and Fahimifar [5] proposed that a fully analytical solution, for stresses and displacements around a tunnel, considering the effect of the damaged zone induced by the excavation impact, can quantify the real effect of a damage zone developed by a TBM excavation impact around a tunnel and its influence on the overall response of the tunnel.…”

Section: Introductionmentioning

confidence: 99%

“…However, relatively few studies on the correlation between deep TBM tunnel support and surrounding rock stability exist. Individual studies have demonstrated that "bolting and shotcrete + secondary lining" and "segment + pea gravel + surrounding rock" were the main forms of TBM tunnel support [4], with a lack of sufficient theoretical analysis on the mechanical mechanism and behavior of "segment + surrounding rock. "…”

Section: Introductionmentioning

confidence: 99%

The Analysis of Time‐Space Effect of Surrounding Rock Deformation of TBM Tunnels in Deep Composite Stratum with or without Support

Sun

Ren

Yuan

et al. 2020

Advances in Civil Engineering

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In view of difficult problems such as excavation, segment simulation, deformation, and force measurement in the small-scale model testing of deep composite stratum TBM tunnel, the TBM simulation experimental device, the model segment ring prefabrication device, and the digital photogrammetry technology were comprehensively adopted. Also, the calculation methods were proposed. The analysis of the deformation characteristics as well as rupture of surrounding rock revealed those space-time effects: (1) When no support existed, the space-time effect of the surrounding rock deformation was concentrated in the following case: with the development of time, the deformation of surrounding rock starts from the sides of the arch waist at the junction of the composite stratum, while four arcs were derived and shear sliding occurred, resulting in overall collapse and destruction. (2) Following the support application, the space-time effect of the surrounding rock deformation was concentrated on the three stages of the interaction between the surrounding rock and the support, namely, the preliminary stage, the equilibrium process, and the instability state. The spatial effect was concentrated in the area where the surrounding rock was deformed and destroyed. The most severe area was the shallow surrounding rock, while the sub-violent area was the corner of the sidewall.

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“…Prasad et al [35] proposed a new algorithm of tunnel structural support pressure to evaluate the stability of surrounding rock based on the key block theory. Based on the block theory, Zhang et al [36,37] studied the influence of interaction between cutting tools and rock blocks on the stability of TBM shield tunneling face. Jiang, A. and Jin, L.F. [38] and Li, X. et al [39] have applied support vector machine (SVM) methods to analyze and evaluate the stability of the surrounding rock of a tunnel.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Collapse Mechanism and Treatment Evaluation of a Deeply Buried Hard Rock Tunnel

et al. 2020

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Collapse is one of the most dangerous geological disasters in tunnel construction, and it is an urgent engineering problem which needs to be solved. Taking the collapse of the top of an actual tunnel face as an example, through field investigation and theoretical calculation methods, the mechanism of tunnel collapse was studied, and the treatment and evaluation of the collapse area were proposed based on field monitoring data. The results show that the extrusion and bulging deformation on the palm surface and the tensile fracture in the top inclined stratum led to the shear slip of the block along the structural surface and the local collapse of the surrounding rock. Based on the block theory, the potential unstable block at the top of the tunnel was successfully identified, and the treatment method of ‘protecting before filling and then digging’ was proposed. The comprehensive treatment measures of advance bolts, steel arch support, collapse backfill, and step excavation were adopted, with on-site monitoring followed up step by step. Based on the analysis of surrounding rock deformation and stress characteristics, in this paper we demonstrate that the treatment effects of the collapse area are good, and ensure the safety and smooth progress of construction. The proposed treatment method achieved the expected goal and was shown to be able to provide successful treatment for similar collapse cases of tunnel engineering.

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Analysis on the Evolution of Rock Block Behavior During TBM Tunneling Considering the TBM–Block Interaction

Cited by 23 publications

References 46 publications

Cutting Mechanical Study of Pick Cutting Coal Seams with Coal and Rock Interface

Cutting Mechanical Study of Pick Cutting Coal Seams with Coal and Rock Interface

The Analysis of Time‐Space Effect of Surrounding Rock Deformation of TBM Tunnels in Deep Composite Stratum with or without Support

Analysis of Collapse Mechanism and Treatment Evaluation of a Deeply Buried Hard Rock Tunnel

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