Analysis of the excavation damaged zone around a tunnel accounting for geostress and unloading

Yang, Han; Zeng, Yawu; Lan, Yangbin; Zhou, Xiaoping

doi:10.1016/j.ijrmms.2014.03.003

Cited by 149 publications

(30 citation statements)

References 21 publications

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“…[16][17][18][19] In most rock masses, multiple sets of joints have been encountered. [16][17][18][19] In most rock masses, multiple sets of joints have been encountered.…”

Section: Yang Et Almentioning

confidence: 99%

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Development of a damage rheological model and its application in the analysis of mechanical properties of jointed rock masses

Yang

Luo

Kang

et al. 2019

Energy Science & Engineering

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Fossil fuel resources (eg, coal, oil, and natural gas) exist in underground reservoirs, where discontinuities are widespread and influence the stability of rock structures. The mechanical behavior of jointed rock masses significantly affects the long‐term stability of rock engineering. A major challenge in this area is to link the time‐dependent deformation with damage influence induced by distribution of joints in rock masses. In this paper, a damage mechanical theory is adopted which deals with several groups of joints distributed in rock masses. Based on the geometrical distribution of joints, a damage model considering the influence of normal vector and area density of joints is used to describe the discontinuities. A damage rheological model for jointed rock masses is developed and programmed in the finite difference software FLAC3D, and an example of jointed rock masses is used to verify the validity of the model. The damage rheological model could predict the visco‐elastic strain which corresponds to primary creep property, visco‐plastic strain which corresponds to steady state creep property, and damage strain which reflects the damage effect of joints to rock masses. Finally, we use this model to predict the displacements and damage zones in the rock masses surrounding an underground opening.

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“…[16][17][18][19] In most rock masses, multiple sets of joints have been encountered. [16][17][18][19] In most rock masses, multiple sets of joints have been encountered.…”

Section: Yang Et Almentioning

confidence: 99%

“…Field evidence has shown that damage of a jointed rock mass is a time-dependent behavior accompanied by the joint opening, closing, and extension. [16][17][18][19] In most rock masses, multiple sets of joints have been encountered. Depending on their relative scale compared with the structure, the joints can be analyzed in different ways.…”

Section: Yang Et Almentioning

confidence: 99%

Development of a damage rheological model and its application in the analysis of mechanical properties of jointed rock masses

Yang

Luo

Kang

et al. 2019

Energy Science & Engineering

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“…The amount of geotechnical problems is rather wide. The majority of investigations are dedicated to the estimations of stress-strain state around the underground tunnels or excavations with analytical [Chanyshev et al, 2014;Demin et al, 2015;Lu and Yang, 2013] and numerical [Kiya et al, 2015;Pardoen et al, 2012;Roatesi, 2010;Yang et al, 2014] solutions of boundary problem. The results of these estimations provide a good information about disintegration of rocks around the excavations and/or tunnels due to plastic deformations.…”

Section: Introductionmentioning

confidence: 99%

“…http://elpub.wdcb.ru/journals/rjes/doi/2016ES000574-res.html our mind, the most interesting papers concern the temporal mechanical behavior of rock mass with excavations as soon as it supposes the investigation of stability of development workings, rock mass elements (roof and floor) and the influence of rock pressure manifestation during mining [Khoshboresh, 2013;Nuric et al, 2012;Pavlova et al, 2004;Shabanimashcool, 2012]. The stability and/or development of inelastic strains/fracture around the underground openings is usually considered as the boundary problem of the media with tunnel of circle or other cross-section form subjected to multi-axial loading [Pardoen et al, 2012;Yang et al, 2014;Zhu et al, 2005]. The lack of papers is observed concerning the problem of modeling the excavation at coal face moving [Kwasniewski, 2008;Verma et al, 2013;Wang et al, 2014].…”

Section: Introductionmentioning

confidence: 99%

Fractal characteristics of seismic process in rock mass at mining: Mathematical modeling and analysis

Eremin¹

2016

Russ. J. Earth Sci.

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It is shown in the paper that the system of equations of solid mechanics, which has a mixed type, demonstrate the most common features of evolution of nonlinear dynamic systems. Previous investigations of seismic process were carried out on the base of simplified (sand-pile, land-slide) models which gave a graph of recurrence of seismic events and information about the state of self-organized criticality (SOC). However, these simplified models do not contain the information about the stress-strain state of the loaded geomedia and its proximity to the critical state. In the proposed paper the model of rock mass with excavation is constructed and general step of roof caving is modelled. On the base of these modeling the formation of critical state in loaded geomedia is studied. The fluctuations of stress-strain state at different points of geomedia are studied as the reflection of fracture process occurring in the main elements of rock mass: roof and floor, when the coal face is advanced. It is shown that the probability distribution function (PDF) dependencies, amplitude-frequency characteristics reflect the state of the rock mass and might be considered as the fractal characteristics of fracture process within. The evolution of these dependencies shows the dramatic change when the critical state is formed in the rock mass surrounding the underground opening. KEYWORDS: Mathematical modeling; fractal characteristics; coal mining; roof caving; stress fluctuations; critical states; damage accumulation.

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“…The formation of excavation damaged zone around tunnel under geo-stress environment involves a coupled damage evolution process, whose main mechanism is growth of cracks owing to unloading and stress redistribution apart from blasting [41]. Loading stiffness and stress distribution in the surrounding rock mass, resulting in both stable and unstable shear failures along discontinuities as the excavation proceeds, influence the stability of underground workings apart from ground vibrations generated due to blasting [8].…”

Section: Introductionmentioning

confidence: 99%

Stability of underground mine workings due to surface blasting

Singh¹

2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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Blasting in the mining industry is being transformed, and can no longer be treated as an art or a practice purely dependent upon experiences of individuals. Examples of key drivers that have demanded consistent and more accurate blast results are initiatives to control pit-wall damage to help mine operators for steeper pit slope angles, to control damage to adjoining underground mine opening due to open-pit mining. Such situation exists at Rampura Agucha open-pit lead zinc mine which is producing 5.7 Mt/a of ore and has started its underground part which is slated to produce initially 2-2.4 Mt/a and 4.5 Mt/a in near future. The open-pit mine is currently working at 370 m depth and is designed to reach 400 m deep. The underground operations have been commenced successfully maintaining 50 m parting from the planned ultimate level of the open-pit mine. Presently, open-pit and underground mines are being operated simultaneously. The present average depth of underground working lies between 370 and 410 m below the surface level. Sometimes explosives up to 95,978 kg are being detonated in a blast round in open-pit mine for speedy removal of overburden. These blasts are often apprehended as a danger to the safety and stability of underground openings. It was decided to document the impact of open-pit blasting in the openings of underground workings, so that preventive measures may be taken for the safety and long term stability of the underground mine. The impact of 86 open-pit blasts has been documented in the underground openings and 258 blast vibration data has been recorded. The vibrations were recorded simultaneously in the roof, side walls and at floor levels. The highest levels of vibrations were recorded in the roof and the lowest levels at the corresponding floor levels. The pillars experienced lower level of vibrations than those of the roof. Blast designs were optimised at open-pit mine to control vibration in view of long term safety and stability of the underground openings. The underground development face blasts were also optimised for the safety and stability of underground workings. Vibrations generated due to detonation of explosives with shock tubes and electronic delay detonators have been recorded in underground openings for comparative assessment. Ground vibration recorded at roof, pillar and floor were analysed separately and threshold value of the vibration for the safety of underground workings has been determined based on the Rock Mass Rating (RMR) of the roof rock and accordingly blast designs have been optimised which helped in exploitation of precious minerals from openpit as well as from underground mines simultaneously.

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Analysis of the excavation damaged zone around a tunnel accounting for geostress and unloading

Cited by 149 publications

References 21 publications

Development of a damage rheological model and its application in the analysis of mechanical properties of jointed rock masses

Development of a damage rheological model and its application in the analysis of mechanical properties of jointed rock masses

Fractal characteristics of seismic process in rock mass at mining: Mathematical modeling and analysis

Stability of underground mine workings due to surface blasting

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