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Analysis of crack propagation in a “pull-out” test

Abstract

The article describes a computer analysis of the pull-out test used to calculate the force needed to pull out a rock fragment and determine the shape of this broken fragment. The analyzed material is sandstone and porphyry. The analysis included the first approach to using own subroutine in the Simulia Abaqus system, that is, which task is undertaken to accurately determine the crack path of the Finite Element Method model. The work also contains a description of laboratory tests and analytical considerations.

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Rock Strength Anisotropy in High Stress Conditions: A Case Study for Application to Shaft Stability Assessments

References [1] BARTON N., Shear strength criteria for rock, rock joints, rockfill and rock masses: Problems and some solutions, Journal of Rock Mechanics and Geotechnical Engineering, 2013, 5(4), 249-261, DOI: 10.1016/j.jrmge.2013.05.008. [2] BARTON N., PANDEY S.K., Numerical modelling of two stoping methods in two Indian mines using degradation of c and mobilization of φ based on Q-parameters, International Journal of Rock Mechanics and Mining Sciences, 2011, 48(7), 1095-1112, DOI: 10.1016/j.ijrmms.2011

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Modified ground support with alternative fill material for ground control at munsar underground manganese mine of moil limited, India

REFERENCES Barton N. & E. Grimstd (1976), the Q system following 20 years of application NMT support selection, Indo-Norwegian workshop on rock mechanics, KGF, India. pp. 1-9. Bieniawski Z.T. (1973), Engineering Classification of Jointed Rock Masses, Trans. South Africa Institute, Civil Eng., 15 CMRI Report (2001), 2 nd Interim Report on geotechnical properties and classification parameters of Munsar, Beldongri, Chikla, and Gumgaon mines, 4 p. Manekar G G, Shome D, and Chaudhari M P, (2018), Conservation of valuable mineral by rock

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A note on the differences between Drucker-Prager and Mohr-Coulomb shear strength criteria

1 Introduction In soil and rock mechanics, the Mohr-Coulomb (MC) shear strength criterion, along with its parameters, namely friction angle and cohesion, is treated as a kind of standard and reference concept for other shear strength criteria. This is due to the fact, that it fits well the experimental data, where asymmetric strength response in triaxial compression (TXC) and triaxial extension (TXE) tests is observed. Moreover, the MC criterion parameters have clear engineering interpretation and they are typically obtained in most geotechnical

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Complex analysis of uniaxial compressive tests of the Mórágy granitic rock formation (Hungary)

measured by strain gauges, which measures the deformation between 1/4 and 3/4 of the sample’s height. Fifty uniaxial compressive tests were performed in the rock mechanics laboratory at RockStudy Ltd. The NX ( d = 50 mm)-sized cylindrical rock samples having the ratio of L / d = 2/1 (here L and d are the length and diameter of a sample, respectively) were prepared (see Fig. 4 ). Mechanical properties of granitic rock samples are summarised in Table 1 . Figure 4 A prepared sample in the beginning of the UCS test. Table 1 Mechanical properties

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The influence of normal fault on initial state of stress in rock mass

REFERENCES [1] B yerlee J., Friction of Rocks , Birkhauser Verlag, Pageoph., 1978, Vol. 116, 615–626. [2] B arton N.R., Review of a new shear strength criterion for rock joints , Engng. Geol., 1973, 7, 287–332. [3] B arton N.R., The shear strength of rock and rock joints , Int. J. Rock Mech. Min. Sci. & Geomech. Abstr., 1976, 13, 1–24. [4] B arton N.R., C houbey V., The shear strength of rock joints in theory and practice , Rock Mech. 1977, 10, 1–54. [5] J aeger J.C., C ook M.G.W., Fundamentals of Rock Mechanics , London

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Optimization Analysis of Construction Scheme for Large-Span Highway Tunnel Under Complex Conditions

REFERENCES 1. Y. Q. Liu, S. H. Zhong, LU Rusui, et al, “Experimental study on mechanical characteristics of twin tunnels with small spacing”, Chinese Journal of Rock Mechanics and Engineering 19(5): 590-594, 2000. 2. X. G. Jin, L. S. Wang, H. Wei, “Surrounding rock deformation monitor and application in highway tunnel”, The Chinese Journal of Geological Hazard and Control 11(1): 19-23, 2000. 3. T. L. Cui, “Structural internal force monitoring and stability analysis on primary lining bored tunnel with a shallow depth”, Modern Tunnelling

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Experimental Research on Energy Release Characteristics of Water-Bearing Sandstone Alongshore Wharf

References 1. Xie, H.P., Ju, Y., Peng, L.Y.: Criteria for strength and structural failure of rocks based on energy dissipation and energy release principles, Chinese Journal of Rock Mechanics & Engineering, Vol. 24, no 17, pp. 3003-3010, 2005. 2. Chen, X.G., Zhang, Q.Y.: Research on the energy dissipation and release in the process of rock shear failure, Journal of Mining & Safety Engineering, Vol. 27, no 2, pp. 179-184, 2013. 3. Xue, D.J., Zhou, H.W., Zhong, J.C., Huang, Y.M.: Mininginduced release of energy

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Static Load Test on Instrumented Pile – Field Data and Numerical Simulations

Abstract

Static load tests on foundation piles are generally carried out in order to determine load – the displacement characteristic of the pile head. For standard (basic) engineering practices this type of test usually provides enough information. However, the knowledge of force distribution along the pile core and its division into the friction along the shaft and the resistance under the base can be very useful. Such information can be obtained by strain gage pile instrumentation [1]. Significant investigations have been completed on this technology, proving its utility and correctness [8], [10], [12]. The results of static tests on instrumented piles are not easy to interpret. There are many factors and processes affecting the final outcome. In order to understand better the whole testing process and soil-structure behavior some investigations and numerical analyses were done. In the paper, real data from a field load test on instrumented piles is discussed and compared with numerical simulation of such a test in similar conditions. Differences and difficulties in the results interpretation with their possible reasons are discussed. Moreover, the authors used their own analytical solution for more reliable determination of force distribution along the pile. The work was presented at the XVII French-Polish Colloquium of Soil and Rock Mechanics, Łódź, 28–30 November 2016.

Open access