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The influence of temperature on the rock-like material strength in the process of compression test was related to thermal stress and thermal damage. The components and the microcracks inside the specimen were expanded during heating, which led to them partially closing, thereby strengthening the specimen (i.e., thermal stress) [ 12 ].
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Surprisingly, very few attempts have been made to elucidate the temperature influence on rock strength in the mild temperature range between room temperature (RT) and 200 °C in detail. Consequentially, the recorded data in the range of RT to 200 °C are scattered ( Wu et al., 2013; Yang et al., 2017a, Yang et al., 2017b; Yavuz et al., 2010 ...
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Bahrani N, Kaiser PK (2016) Numerical investigation of the influence of specimen size on the unconfined strength of defected rocks. Comput Geotech 77:56–67. Article Google Scholar Bahrani N, Kaiser PK (2017) Estimation of confined peak strength of crack-damaged rocks. Rock Mech Rock Eng 50:309–326
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Hassani and Nekoovaght 13 and Hassani et al. 14 conducted comprehensive laboratory tests to investigate the influence of microwave radiation on the temperature profiles and the strength reduction in hard rocks such as norite, granite, and basalt. The samples were exposed to the microwave energy of 1.2, 3 and 5 kW for 10, 65 and 120 s …
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Overall mechanical behaviour of jointed rock masses is predominantly controlled by the shear strength of rock joints which contain infill materials. Barton's empirical model has been shown to be one of the most successful model in predicting joint shear strength (Barton and Choubey in Rock Mech 10:1–54, 1977). However, the …
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In the early twentieth century, many researchers showed that particle morphology influences geotechnical properties (Rodriguez 2013; Ovalle et al. 2014; Li 2013a).It was acknowledged that shear strength is one of the most critical parameters that characterize the geotechnical behavior of the soil and rock (Siang et al. 2014).Particle and surface …
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The rock specimen's compressive-shear strength is far higher than its tensile-shear strength, but tensile-shear tests accumulate more AE counts and energy. Tensile-shear failure has a large crack opening and rapid temperature progression. The rock specimen cools before peak strength, which is the opposite of compressive-shear …
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DOI: 10.1016/J.CONBUILDMAT.2019.04.078 Corpus ID: 146402646; Influence of surface roughness and hydrophilicity on bonding strength of concrete-rock interface @article{Shen2019InfluenceOS, title={Influence of surface roughness and hydrophilicity on bonding strength of concrete-rock interface}, author={Yan-jun Shen …
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In natural rock masses, numerous randomly distributed and varying-sized joints significantly influence the mechanical properties of the rock. In recent years, many scholars have conducted many ...
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The influence of σ 2 on rock strength is usually characterized by an increase in failure strength with the increase of σ 2, followed by a strength plateau and then a strength drop soon after any further increase of …
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3.1 Deformation Behavior and Rock Strength. The influence of grain size heterogeneity on the simulated stress-strain responses and rock strength evolutions of the numerical models will be examined and discussed in this section. ... That is why the rock strength of homogeneous model is higher than that of heterogeneous model …
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determine the mechanical properties of the entire rock mass and significantly influence its strength, deformation, and failure mode (Li et al. 2020). Flaws can also lead to local stress redistribution, alter the local stress field of adjacent rock masses (Pollard 1987), and significantly affect the
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The strength of rock mass with weak joints is mainly under control of the joints occurrence, the joints dip and the rock strength, and great influenced by the confining pressure. A higher strength ...
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Abstract. This paper discusses some important factors to be considered when undertaking rock strength tests and describing the strength of a rock as assessed during field investigations. It highlights the lack of consistency in the commonly used descriptive categories and draws attention to the disparencies which can arise when rocks are …
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To study the effect of the host rock strength on the shear performance of micro-NPR steel bolted rock joints, three representative natural rocks, red sandstone, marble, and granite, were used (Fig. 3 a)pared to the cement mortar, concrete, and other similar materials commonly used in this test, natural rock can more accurately …
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The damage threshold of rocks is used as a criterion to determine whether the rock is damaged or not. The damage threshold is related to the deformation characteristics in the pre-peak elastic stage at a low-stress level. In addition, after the damage, the rock still has residual strength, which is the main factor affecting the …
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Currently, the inability to master the damage law of reservoir rock is one of the major obstacles to the efficient development of geological resources using supercritical carbon dioxide (SC-CO 2), and the key issue is the unknown influence mechanism of mineral dissolution on the altered reservoir strength.Therefore, the aim of this study …
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To investigate the influence of the lamina effect on the tensile strength of shallow marine shales and improve the shortcomings of the existing Brazilian standard disc splitting method, the Lamina shale of the Upper Ordovician Wulalik Fm in the western margin of the Ordos Basin was selected as the experimental object. Based on the radial …
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The majority of laboratory and in situ experiments on the influence of scale on rock strength such as those reported by Bieniawski [3], Pratt et al. [30], Hoek and Brown [13] and others suggest an asymptotic reduction in the strength with increasing specimen size until the strength remains essentially constant (i.e., at the REV size). However ...
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The uniaxial compressive strength (UCS) is a commonly used measure of intact rock strength, and its application to practical problems in rock engineering is widespread. ... investigate the influence of some intrinsic physical rock properties on the established correlations; and (4) examine the possible effects of specimen size on the …
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Cutting hard rocks has some problems such as low penetration rate and high wear rate of cutting tools. These problems can be solved by the microwave treatment of hard rocks during cutting. In this study, the effects of microwave treatment were investigated on the strength of nine different igneous rocks. First, the uniaxial compressive strength …
DetailsThe shear strength of rock discontinuities strongly depends on the water content especially when the rocks contain clay materials. To assess the decrease in the mechanical properties of clay-infilled discontinuities due to water saturation, a series of direct shear tests was performed using an advanced shear box that allows the injection …
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The dynamic shear strength of rock joints was analyzed theoretically following the Coulomb-Navier criterion and further investigated experimentally by split Hopkinson pressure bar (SHPB) tests ...
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A change in the fragment strength will influence the efficiency of the grinding circuit in further breaking those fragments. ... The third measure of rock strength was obtained using the JKMRC ore abrasion test (Napier-Munn et al., 1996). This test was conducted on each of the samples that were subjected to a Drop Test.
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The influence of roughness on the shear strength of rock joints has been extensively studied both experimentally and theoretically [4], [8], ... Small-scale tests [34] have shown that the location of an asperity along an interface strongly influences its contributions to strength. Therefore, it was important to determine if these results were ...
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Deep rock mass often forms staggered complex structural planes during tectonic movement. As the most common form of joint in a natural rock mass, cross joints exert a significant influence on the strength and deformation characteristics of a …
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Request PDF | Influences of Schistosity Structure and Differential Stress on Failure and Strength Behaviors of an Anisotropic Foliated Rock Under True Triaxial Compression | Foliated rocks are ...
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A clearly visible upward trend and downward trend of the strength before and after 100°C can be observed. At 90°C, the maximum increase in tensile strength was calculated as 21.45% while at 130°C a rapid fall in tensile strength up to 25% was found as compared to the strength reduction at 110°C (12.93%) (Fig. 5 ).
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Estimating compressive strength. General rock failure criterion can be reduced to a few parameters dependent on lithology (m) and the uniaxial compressive strength (C 0).Lithology is commonly derived during log analysis, so m may be estimated (Table 1).What is needed still is an initial measure of rock strength provided by C 0. C …
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The influence of rock strength properties on Jaw Crusher performance was carried out to determine the effect of rock strength on crushing time and grain size distribution of the rocks. Investigation was conducted on four different rock samples namely marble, dolomite, limestone and granite which were representatively selected …
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In this study, the petrographic characteristics affecting the strength of granitic rocks were investigated and a new mineralogical-based model was suggested for the prediction of uniaxial compressive strength (UCS) in line with the obtained data. Increase in quartz and alkali feldspar contents with decrease in plagioclase content …
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Weathering is a geomorphic process that causes rocks and minerals to break down and disintegrate. Physical, chemical, and biological actions all alter the Earth's surface, and various factors, including rock strength or hardness, mineral chemical composition, and rock texture or structure, all influence weathering.
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The induced heterogeneity changes the rock properties. This paper targets the gap in the existing literature regarding the adopting of artificial neural network approaches to efficiently and accurately predict the influences of heterogeneity on the strength of 3D-printed rocks at different strain rates.
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To fully understand the thermal influences on rock permeability, both thermally induced fracture closure and microcracking need to be considered in more detail. ... Pradhan SP, Singh TN (2011) Tensile strength of rock under elevated temperatures. Geotech Geol Eng 29:1127–1133. Article Google Scholar Wai RSC, Lo KY, Rowe RK …
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