Stress relaxation during creep of rocks around deep boreholes

Paraschiv-Munteanu, Iuliana; Cristescu, N.

doi:10.1016/s0020-7225(00)00060-4

Cited by 21 publications

(9 citation statements)

References 6 publications

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“…However, with active support, S 1 , the radii of the plastic regions were reduced to 121 mm, 165 mm, and 183 mm for 1 day, 2 days, and 5 days after drilling, respectively. e stability of the borehole weakens over time due to the creep of the coal, which is consistent with the results of Liu and Paraschiv-Munteanu et al [42,43]. However, the active support imposed on the borehole can efficiently limit the enlargement of the damage region and the plastic region, resulting in improved stability of the gas drainage borehole.…”

Section: Simulation Of Gas Drainage Borehole Stabilitysupporting

confidence: 88%

Swelling Pressure of Double‐Expansive Material and Its Active Support Effect for Coal Seam Gas Drainage Borehole

Wang

Sun

2018

Advances in Materials Science and Engineering

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To improve coal seam gas drainage performance, we developed a double-expansive (DE) material to seal the borehole. The swelling process of this material includes an initial swelling stage and a secondary swelling stage. We studied the swelling pressure properties of the DE material under four constraint conditions using a self-made swelling test device. Further, the active support effect of the DE material on the borehole was analyzed by simulating borehole stability with COMSOL Multiphysics software. The results exhibit the following: (1) The swelling pressure of the DE material exhibits time-dependent behavior, and the mathematical relationship between the swelling pressure and time can be obtained by nonlinear fitting. (2) The radial swelling potential is principally formed during the secondary swelling stage, providing the main active support on the radial constraint. (3) The active support imposed on the hole wall can prevent the extension of plastic and damage regions around the borehole, for improved stability of the gas drainage borehole. Finally, field tests demonstrate improved gas drainage performance of the borehole sealed by the DE material compared to a conventional sealing material.

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Section: Simulation Of Gas Drainage Borehole Stabilitysupporting

confidence: 88%

Swelling Pressure of Double‐Expansive Material and Its Active Support Effect for Coal Seam Gas Drainage Borehole

Wang

Sun

2018

Advances in Materials Science and Engineering

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“…An analytical expression has been developed by which allows to quickly evaluate the instantaneous closure velocity and the time available before the well is too narrow to proceed securely. Since then, increasingly complex models have been used to forecast hole closure in the high pressure, high temperature environment encountered during drilling (Carcione et al, 2006;Fossum and Fredrich, 2007;Hou et al, 2012;Paraschiv-Munteanu and Cristescu, 2001;Weijermars et al, 2013). The challenge, however, of understanding the underlying mechanisms of hole closure and providing the best model for it has remained the same.…”

Section: Why Is Hole Closure In Salt An Issue?mentioning

confidence: 99%

Long-term cavity closure in non-linear rocks

Cornet¹,

Dąbrowski

Schmid

2017

Geophysical Journal International

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I would also like to use this opportunity to thank the people from Wroclaw for welcoming me in their group: Marta, Marcin, Maciej, Lukasz and the others. Wroclaw has become my new home and I am very excited about it. Finally, my family and friends from my previous life have always been there for me and for that I am very grateful. These past few years have not been easy and it has been very helpful to know you by my side, even though we were not geographically close, so for that thank you.

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“…It has been, however, recognized that the delayed behavior represents a fundamental component of rock deformation in many practical rock engineering projects in which the behavior of the rock mass is controlled by the creep and long-term strength properties. [36][37][38][39][40][41][42][43][44][45][46] As far as the viscoelastic behavior of jointed rocks is concerned, several studies have been devoted to experimentally identify and assess the creep properties of the intact and jointed rocks, [47][48][49][50][51][52][53][54][55][56][57][58] as well as those of the individual rock joints. [59][60][61][62][63][64][65][66] Based on the experimental data reported in the literature, models have been therefore formulated with the aim to describe the viscoelastic behavior of jointed rock masses.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical approach to effective viscoelastic behavior of jointed rocks

Maghous

Aguiar

Rossi

2021

International Journal of Rock Mechanics and Mining Sciences

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Assessing the overall instantaneous behavior and strength properties of jointed materials have been the subject of important investigations in the last decades, including phenomenological or micromechanics-based contributions. However, less attention has been dedicated to delayed component of deformation in such media. This issue is addressed in this paper, which is devoted to the formulation of a micromechanical approach to effective viscoelastic properties of jointed rocks with consideration of constituents aging. At the scale of representative elementary volume (REV), the joints are modeled as planar interfaces whose behavior is described by means of generalized viscoelastic state equations under normal and shear loading conditions. Closed-form expressions for the homogenized creep tensor are derived from solving an appropriate viscoelastic concentration problem stated on the REV. The local strain and displacement jump fields are analyzed by extending the concept of strain concentration to relate the components of joint displacement jump to macroscopic strain. Main features of the theoretical overall creep behavior, such as the anisotropy associated with the privileged joint orientations, are highlighted through explicit formulations in some particular configurations of the jointed medium. Finally, the ability of the approach to accurately reproduce the creep behavior of jointed media is assessed by comparison with experimental data as well as with finite element solutions derived in the context of multilayered stratified composite modeling.

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Stress relaxation during creep of rocks around deep boreholes

Cited by 21 publications

References 6 publications

Swelling Pressure of Double‐Expansive Material and Its Active Support Effect for Coal Seam Gas Drainage Borehole

Swelling Pressure of Double‐Expansive Material and Its Active Support Effect for Coal Seam Gas Drainage Borehole

Long-term cavity closure in non-linear rocks

Micromechanical approach to effective viscoelastic behavior of jointed rocks

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