Dynamic response of rock mass induced by the transient release of in-situ stress

Lu, Wenbo; Yang, Jianhua; Peng, Yan; Chen, Ming; Zhou, Chuangbing; Luo, Yi; Li, Jin

doi:10.1016/j.ijrmms.2012.05.001

Cited by 141 publications

(54 citation statements)

References 30 publications

(39 reference statements)

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“…1). This instantaneous mechanical process is termed the transient release of in situ stress by Lu et al (2012). However, in previous studies on the excavation responses of high-stress rock masses, the stress redistribution tends to be solved by a static solution.…”

Section: List Of Symbolsmentioning

confidence: 99%

Numerical Simulation of Rock Mass Damage Evolution During Deep-Buried Tunnel Excavation by Drill and Blast

Yang

et al. 2014

Rock Mech Rock Eng

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Presence of an excavation damage zone (EDZ) around a tunnel perimeter is of significant concern with regard to safety, stability, costs and overall performance of the tunnel. For deep-buried tunnel excavation by drill and blast, it is generally accepted that a combination of effects of stress redistribution and blasting is mainly responsible for development of the EDZ. However, few open literatures can be found to use numerical methods to investigate the behavior of rock damage induced by the combined effects, and it is still far from full understanding how, when and to what degree the blasting affects the behavior of the EDZ during excavation. By implementing a statistical damage evolution law based on stress criterion into the commercial software LS-DYNA through its user-subroutines, this paper presents a 3D numerical simulation of the rock damage evolution of a deep-buried tunnel excavation, with a special emphasis on the combined effects of the stress redistribution of surrounding rock masses and the blasting-induced damage. Influence of repeated blast loadings on the damage extension for practical millisecond delay blasting is investigated in the present analysis. Accompanying explosive detonation and secession of rock fragments from their initial locations, in situ stress in the immediate vicinity of the excavation face is suddenly released. The transient characteristics of the in situ stress release and induced dynamic responses in the surrounding rock masses are also highlighted. From the simulation results, some instructive conclusions are drawn with respect to the rock damage mechanism and evolution during deep-buried tunnel excavation by drill and blast.

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Section: List Of Symbolsmentioning

confidence: 99%

Numerical Simulation of Rock Mass Damage Evolution During Deep-Buried Tunnel Excavation by Drill and Blast

Yang

et al. 2014

Rock Mech Rock Eng

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“…Currently, with the rapid development of explosion theory and computer technology, many numerical programs can simulate the explosive process. The commercial finite element program LS-DYNA has proved well-suited to the simulation of the dynamic processes of rock masses [24][25][26]. In addition, wanting a simple and practical equivalent to actual blast loading and real blasts, Toraño et al [27], as well as other researchers [28], sought some simple and practical methods by which to simulate explosive detonation and the propagation of seismic waves.…”

Section: Equivalent Excavations Loadingmentioning

confidence: 99%

3D numerical model for dynamic loading-induced multiple fracture zones around underground cavity faces

Tao

2013

Computers and Geotechnics

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Chengqing 3D numerical model for dynamic loading-induced multiple fracture zones around underground cavity faces, Computers and Geotechnics, 2013; 54:33-45. Copyright © 2013 Elsevier Ltd. All rights reserved. NOTICE: this is the author's version of a work that was accepted for publication in EarthScience Reviews. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Computers and Geotechnics, 2013; 54:33-45 Abstract: Three dimensional numerical modelling was used to examine the fracture responses around cavities in rock masses experiencing the stress of excavation. In addition to the primary fracture zone in the near field, numerical modelling generated a second fracture zone in the far field, and an elastic non-fracture zone between the two fields, i.e., fracture and non-fracture zones occur alternately around a deep cavity. Further research illustrated that the dynamic loading and static stress gradient are two necessary precursors for far field fracture in the excavation process. Neither quasi-static loading nor homogeneous stress conditions can induce a far field fracture. A simple theory is introduced suggesting that multiple fracture zones occur during excavation due to both the initial stress gradient and the dynamic loading. This finding indicates that it may be possible to induce continuous rock fracture in deep underground rock masses by employing optimal excavation methods to generate multiple contiguous fracture zones. Answers to the reviewers' commentsDear reviewers: Our manuscript (ID: COGE-D-13-00021) was revised according to your comments. We hope that our responses have classified each of your comments and can be of help to the improvement of our manuscript. We apologize for the troubles brought by our carelessness. We appreciate your constructive criticisms. This answer sheet lists the major changes and our reply to the reviewers" comments and recommendations. Answer to reviewer #11. Page 5: "a possible"Response: Page 5 "a possible" was added. Page 8: "surely this is a function of the constitute model, is it brittle behaviour or ductile behaviour?"Response: It is brittle behavior, the secondary fracture zone results from the combination of a dynamic loading acting over a cavity and an ascending static initial stress around it. When the peak stress which results from the ascending static stress gradient field in conjunction with the descending dynamic loading in a zone is more than the failure criterion of rock material, another fracture zone in far field will be induced. Page 9: "This is a massive deviatory stress field, are you sure?"Response: Yes, this is a massive deviatory stress field. The aim of this manuscript is to illustrate that the unloading process can induce rock failure, thus the extreme massive deviatory stress fie...

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“…The influences of blasting vibration on underground structures have also been studied using field experiments [7] - [12] and numerical simulations [13] - [21]. The results obtained by numerical simulation can be compared with field experiments during all the blasting time period or in terms of magnitude values.…”

Section: Introductionmentioning

confidence: 99%

“…The comparison of time results obtained with these two methods is usually used in the case of a sole explosion such as in metro due to terrorist acts [12], [13]. A comparison of magnitude values can be used in the case of blasting shots with time delay such as explosions at a tunnel face during tunnel excavation by blasting method [16], [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Impact of Blasting at Tunnel Face on an Existing Adjacent Tunnel

Dang¹

2018

GEOMATE

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Experimental and numerical research of the effect of blasting vibrations during tunneling on surrounding structures (rock mass, existing tunnels, buildings, etc.) was widely studied in recent years. However, the effect of blasting vibration from a new tunnel on an existing adjacent tunnel is still unclear. A few researches were carried out to study the relationship of the observed Peak Particle Velocity (PPV) on the lining areas along the existing tunnel direction, due to either the lack of in situ test data or the difficulty in conducting field tests, particularly for tunnels that are usually old and vulnerable after several decades of service. This paper introduced two dimensional and three dimensional numerical with field data investigations on the effect of tunnel face blasting on the surrounding rock mass and on an existing adjacent tunnel along the existing tunnel direction. The Croix-Rousse tunnel project in Lyon (France) was adopted as a case study. The derived results allow predicting the tunnel lining damage areas under the impact of blast loads.

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Dynamic response of rock mass induced by the transient release of in-situ stress

Cited by 141 publications

References 30 publications

Numerical Simulation of Rock Mass Damage Evolution During Deep-Buried Tunnel Excavation by Drill and Blast

Numerical Simulation of Rock Mass Damage Evolution During Deep-Buried Tunnel Excavation by Drill and Blast

3D numerical model for dynamic loading-induced multiple fracture zones around underground cavity faces

Impact of Blasting at Tunnel Face on an Existing Adjacent Tunnel

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