Influence of elastic constants on the horizontal in situ stress

Sheorey, P.R.; Gurusamy, Mohan; Sinha, A.

doi:10.1016/s1365-1609(01)00069-7

Cited by 67 publications

(20 citation statements)

References 6 publications

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“…From the result of parametric numerical analysis, 'α' can have an attributed value of 3.2 (for depth upto 160m) and 6.9 (for depth more than 160m). As the Kratio has a break even at 160m [27]. K-ratio>1 (for depth less than 160), K-ratio =1 (at depth of 160m) and K-ratio<1 (for depth higher than 160m) [23].…”

Section: Discussionmentioning

confidence: 96%

“…A multiplying factor 'α',for addressing the variation in Kratio [ratio of pre-excavation in-situ horizontal stress (σ ) to pre-excavation in-situ vertical stress (σ )] and increased stress concentration at higher depths needs to be incorporated [27].It is needed to keep the option open about the nature of variation of pre-excavation in-situ stresses and related factors in the strength formula for ribs.…”

Section: Modification Of Strength Formula For Ribsmentioning

confidence: 99%

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Rib geomechanics: Its impacts in coal pillar extraction

K¹,

Agrawal²,

Singh³

2016

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

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Abstract-In Bord & Pillar (B&P) depillaring, there are redistributions of mining-induced stresses on acontinual basis, primarily with apronounced effect on the natural supportsribs and stooks. A rib need to be stable on temporary timeframe such that (a) it should provide adequate safety to men and machines during depillaring and (b) it should offer no resistance to caving, even in the worst situation when it is not 'judiciously' reduced during theretreat. The stability of ribs can be estimated through a well-known aspect ratio called factor of safety (FOS), which is thestrength of ribs (S) divided by stress (P) coming over it. The strength of ribs plays a pivotal role in estimating thestability of ribs, depending on geo-mining details, sequences of extraction and related technical/managerial issues in a depillaring panel. This paper suggests a modified rib strength formulation in addition to discussing related issues.Estimation of stress on ribs using numerical modeling with rational engineering judgements and pragmatic simulations have also been briefed in this paper.Case-study of depillaring panels in eight mines, having no pronounced geotechnical problems due to rib stability, have been analysed with the formula presented in this paper.

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Section: Discussionmentioning

confidence: 96%

Section: Modification Of Strength Formula For Ribsmentioning

confidence: 99%

Rib geomechanics: Its impacts in coal pillar extraction

K¹,

Agrawal²,

Singh³

2016

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

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“…According to Equation (16), if α ≤ 0.2, the process is terminated and we will have the equations for estimating in situ stresses at an arbitrary point; otherwise, it is used to recalculate the parameters ξ and η by Equation (8). However, if the precision is not satisfied after 10 times, the user should decrease the accuracy of the estimation (i.e., increase the value of α).…”

Section: Improved Sheorey's Methodsmentioning

confidence: 99%

“…In most cases, we pay more attention to the major horizontal stress and shear stress rather than the mean horizontal stress. Sheorey was also aware of the issue, and conducted further research thereof [16]; however, his work still could not solve the problem perfectly. 3.…”

Section: Comments On Sheorey's Modelmentioning

confidence: 99%

“…The coefficient of linear thermal expansion β is not widely reported, but Table 5 provides the values for some rocks available from published literature [29,30]. From Table 5, we can take the thermal expansion coefficient β for granite as 6.0 × 10 −6 / ∘ C. For crustal rocks, the thermal gradient G is taken as 0.024 ∘ C [16]. In addition, through collecting a large number of in situ stress measurements under the same tectonism, we used the least-squares approach to determine the two constants ξ and η in Equation (8), and the distribution of error can thus be controlled.…”

Section: Determination Of the Parametersmentioning

confidence: 99%

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An improved method for estimating in situ stress in an elastic rock mass and its engineering application

Pei¹,

Ding

et al. 2016

Open Geosciences

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Abstract:The main contribution of this paper is to develop a method to determine the in situ stress on an engineering scale by modifying the elasto-static thermal stress model (Sheorey's model). The suggested method, firstly, introduces correction factors for the local tectonism to reflect the stress distribution difference caused by local tectonic movements. The correction factors can be determined by the least-squares approach based on laboratory tests and local in situ stress measurements. Then, the rock elastic modulus is replaced by rock mass elastic modulus so as to show the effect of rock discontinuities on the in situ stress. Combining with elasticity theory, equations for estimating the major and minor horizontal stresses are obtained. It is possible to reach satisfactory accuracy for stress estimation. To show the feasibility of this method, it is applied to two deep tunnels in China to determine the in situ stress. Field tests, including in situ stress measurements by conventional hydraulic fracturing (HF) and rock mass modulus measurements using a rigid borehole jack (RBJ), are carried out. It is shown that the stress field in the two deep tunnels is dominated by horizontal tectonic movements. The major and minor horizontal stresses are estimated, respectively. Finally, the results are compared with those derived from the HF method. The calculated results in the two tunnels roughly coincide with the measured results with an average of 15% allowable discrepancy.

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FLAC 3D Modeling for Excavation Activity in an Underground Marble Quarry in Ambaji (Gujarat - India)

Bettini,

Ilic

2023

Springer Proceedings in Earth and Environmental Sciences

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Influence of elastic constants on the horizontal in situ stress

Cited by 67 publications

References 6 publications

Rib geomechanics: Its impacts in coal pillar extraction

Rib geomechanics: Its impacts in coal pillar extraction

An improved method for estimating in situ stress in an elastic rock mass and its engineering application

FLAC 3D Modeling for Excavation Activity in an Underground Marble Quarry in Ambaji (Gujarat - India)

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