Triaxial compression tests on a granite at different strain rates and confining pressures

Li, H.B.; Zhao, Jun; Li, T.J.

doi:10.1016/s1365-1609(99)00120-3

Cited by 127 publications

(51 citation statements)

References 5 publications

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“…The former is the opposite from the observation by Li et al [9] for the Bukit Timah granite of Singapore. They reported that Young's modulus seems to increase slightly with increasing confining pressure.…”

Section: Stress Rate Dependence Of Young's Modulus and Poisson's Ratiocontrasting

confidence: 83%

Long-Term Mechanical Behavior of Yucca Mountain Tuff and its Variability, Final Technical Report for Task ORD-FY04-021

Daemen¹,

Ma²,

Zhao³

2006

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Section: Stress Rate Dependence Of Young's Modulus and Poisson's Ratiocontrasting

confidence: 83%

Long-Term Mechanical Behavior of Yucca Mountain Tuff and its Variability, Final Technical Report for Task ORD-FY04-021

Daemen¹,

Ma²,

Zhao³

2006

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“…D represents the inelastic volumetric strain and ΔV is the water injection volume inferred from water volume change in the syringe pump. et al, 1966;Byerlee, 1967;Mogi, 1967;Scholz, 1968;Kranz, 1980;Masuda et al, 1987;Martin and Chandler, 1994;Li et al, 1999;Haimson and Chang, 2000;Golshani et al, 2006;Zhao et al, 2013Masuda et al 1988 Indian 20-50 MPa ; stress corrosion , Scholz, 2002 C /C 40% C /C Brace et al 1966Scholz 1968Kranz 1980 30-60% IVA1335 IVA1370 Table 1 σ cd /C , Brace et al, 1966;Bieniawski, 1967;Scholz, 2002;Paterson and Wong, 2004;Takemura and Oda, 2005 Table 1 Fig. 7 …”

Section: Bridgeman 1949mentioning

confidence: 99%

Effects of Confining Pressure and Pore Water Pressure on the Strain Behavior and Deformation Property of Aji Granite under Triaxial Compression Test

Sawayama

Katayama

2016

Jour. Geol. Soc. Japan

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To investigate the effects of confining pressure and pore water pressure on the strain behavior and deformation properties of Aji granite, triaxial compression tests were performed at a constant strain rate ( . s ) under confining and pore water pressures of -MPa and -MPa, respectively. During the tests, axial and radial strains were measured by two biaxial strain gauges. The results revealed increases in maximum differential stress and onset of dilatancy with effective confining pressure. Young s modulus tended to increase with confining pressure and decrease with pore water pressure. However, Poisson s ratio remained nearly constant under these experimental conditions. Dilatancy is related to the formation of micro-cracks during deformation and is enhanced at low confining pressures under dry conditions. In contrast, it tends to be suppressed at a high pore water pressure (low effective confining pressure) under wet conditions. These results indicate that stress concentration at the crack tip can be relaxed by the presence of pore water. Moreover, water injection into the specimen during wet experiments rapidly increases at a stress level of ~ % maximum differential stress. This rapid increase can be attributed to the formation of a micro-crack network.

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“…The influence of the strain rate on certain mechanical properties of rocks was described in foreign literature in the 1930s. Newer research dates to the 1960s and subsequent years (Peng, 1973;Paterson, 1978;Blanton, 1981;Okubo & Nishimatsu, 1985;Kwaśniewski, 1986;Lis & Kijewski, 1987;Bezat, 1987;Chong et al, 1989;Krzysztoń, 1990;Olsson, 1991;Lajtai et al, 1991;Li et al, 1999;Bukowska, 2000). These studies refer primarily to tests of the pre-critical parameters of rocks under uniaxial compression.…”

Section: Results Of Tests Of Post-critical Properties Of Carboniferoumentioning

confidence: 99%

Post-Critical Mechanical Properties Of Sedimentary Rocks In The Upper Silesian Coal Basin (Poland)

Bukowska¹

2015

Archives of Mining Sciences

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In this paper, we present the results of a study of the Upper Carboniferous sedimentary rocks of the Upper Silesian Coal Basin (USCB) in Poland. We examined the hard coals, which belong to various stratigraphic units of Upper Carboniferous coal-bearing strata, and waste rocks, i.e., sandstones, mudstones, claystones. We present the results of tests of their post-critical mechanical properties. These results are from tests of the post-critical modulus, residual stress and residual deformation from experiments using a servo-controlled testing machine (MTS) with uniaxial compression and conventional triaxial compression. We applied confining pressures of up to 50 MPa at a strain rate of 10 -5 -10 -1 s -1 (0.003-6.0 mm/ sec). The confining pressure applied in the triaxial compression tests reflected the conditions of current and future mining activities in the USCB at depths exceeding 1.300 metres. The strain rate applied in the tests reflected the values observed in the rockmass surrounding the mine workings and the rate of certain geodynamic phenomena occurring in the Carboniferous rockmass in the USCB, e.g., rock bursts. We present the values of the sub-critical modulus of coals and waste rocks, the functional relationships between the post-critical modulus and uniaxial compression strength, which are described using an exponential function of high correlation coefficients of the given rocks, and an exponential relationship between the post-critical modulus and the longitudinal elasticity modulus (Young's modulus). Based on the results of tests of the post-critical properties of the Carboniferous rocks under triaxial compression and at various strain rates, we devised the functional relationships between the properties of the rocks and the confining pressure. The dependence of the post-critical modulus of the sandstones and claystones on the confining pressure is described using a polynomial function of degree 2, and that of the coals is described using an exponential function. The relationship between the residual stress and residual deformation in the rocks and the confining pressure was described using a linear function. The obtained results of tests have a practical application in forecasting behaviour of rocks located deep, and designing safe exploitation of mineral deposits. Confining pressures of up to 50 MPa used in the conventional triaxial compression tests allowed us to predict the behaviour of the rock mass at large depths. These data provide general knowledge of the tendencies in behaviour of rocks at substantial depths and the ability to design safe methods of mining deposits of various raw materials, including energy sources. These deposits are mined from increasingly great depths as the reserves are gradually exhausted and collieries of the largest European coal basins are continuously reconfigured.

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Triaxial compression tests on a granite at different strain rates and confining pressures

Cited by 127 publications

References 5 publications

Long-Term Mechanical Behavior of Yucca Mountain Tuff and its Variability, Final Technical Report for Task ORD-FY04-021

Long-Term Mechanical Behavior of Yucca Mountain Tuff and its Variability, Final Technical Report for Task ORD-FY04-021

Effects of Confining Pressure and Pore Water Pressure on the Strain Behavior and Deformation Property of Aji Granite under Triaxial Compression Test

Post-Critical Mechanical Properties Of Sedimentary Rocks In The Upper Silesian Coal Basin (Poland)

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