https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 Prediction of rockfall hazard in open pit mines using a regression based machine learning model https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55333 Wed 15 May 2024 15:48:25 AEST ]]> Experimental studies on fragmentation of rock falls on impact with rock surfaces https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:7221 Wed 11 Apr 2018 17:01:02 AEST ]]> In situ stress determination from inversion of hydraulic fracturing data https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:9235 Wed 11 Apr 2018 11:17:31 AEST ]]> Numerical study of flow anisotropy within a single natural rock discontinuity https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:5277 Wed 11 Apr 2018 11:04:56 AEST ]]> In situ rockfall testing in New South Wales, Australia https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:13856 n and kt) and the equivalent rolling coefficient (μ), which are site-specific. Several series of rockfall tests have been conducted in three different geological environments in New South Wales. The results of the tests show a large variability of the motion parameters, which is due to the natural variability of the blocks and to the randomness of the impact positions. Also, values of kn consistently and systematically higher than the benchmark values from the literature have been inferred. Despite there being no clear correlation between the restitution coefficients and the rotational energy, rotational phenomena are believed to be at the origin of such results.]]> Wed 11 Apr 2018 10:17:13 AEST ]]> Rockfall in open pit mines: management of the pit geometry and protection measures design https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54493 Tue 27 Feb 2024 15:11:05 AEDT ]]> A novel 3D clumped particle method to simulate the complex mechanical behavior of rock https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37217 Tue 01 Sep 2020 15:17:53 AEST ]]> A rigorous multiscale random field approach to generate large scale rough rock surfaces https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45567 Tue 01 Nov 2022 14:46:59 AEDT ]]> Laboratory study on three-dimensional characteristics of gravity flow during longitudinal sublevel caving https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46932 Thu 08 Dec 2022 11:32:24 AEDT ]]> An analytical solution in probabilistic rock slope stability assessment based on random fields https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20790 c,μtanφ), standard deviations (σc,σtanφ), spatial correlation lengths (θc,θtanφ), and the parameters (ρc−tanφ,θc−tanφ) which account for the cross-correlation between cohesion and coefficient of friction. As shown by the examples presented herein, the spatial correlation of shear strength can have an important influence on slope performance expressed by the probability of failure. This is a significant observation, since ignoring the influence of spatial correlation in design may lead to unconservative estimations of slope reliability.]]> Sat 24 Mar 2018 08:06:00 AEDT ]]> Vertical stress changes in multi-seam mining under supercritical longwall panels https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19474 Sat 24 Mar 2018 08:02:21 AEDT ]]> Initiation pressure, location and orientation of hydraulic fracture https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21819 Sat 24 Mar 2018 07:58:44 AEDT ]]> Experimental study on rockfall drapery systems for open pit highwalls https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20892 Sat 24 Mar 2018 07:57:58 AEDT ]]> Horizontal stress under supercritical longwall panels https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:21120 Sat 24 Mar 2018 07:54:01 AEDT ]]> Stability charts for rock slopes based on the Hoek-Brown failure criterion https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:5325 Sat 24 Mar 2018 07:45:57 AEDT ]]> Qualitative evolving rockfall hazard assessment for highwalls https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30880 Sat 24 Mar 2018 07:30:37 AEDT ]]> Dynamic triaxial compression tests on sandstone at high strain rates and low confining pressures with split Hopkinson pressure bar https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47581 −1 to 160 s−1. The results show that the dynamic uniaxial and triaxial compressive strengths of the sandstone will linearly increase with the logarithm of the stain rate. Under approximately the same strain rate, the dynamic triaxial compressive strength will linearly increase with the confining pressure. Although the peak strain has no dependence on the confining pressure, it will generally increase with the strain rate. The secant modulus is independent of the strain rate and confining pressure. Three trend diagrams, which reflect the influences of strain rate or confining pressure on the dynamic mechanical properties of sandstone in the uniaxial and triaxial compression tests, are given, and the correlation between the failure modes of the sandstone specimens and the characteristics of the stress-strain curves is also analyzed.]]> Mon 23 Jan 2023 14:21:30 AEDT ]]> Mechanical performances of rock-concrete bi-material disks under diametrical compression https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48822 Mon 10 Apr 2023 10:35:35 AEST ]]> The effect of rock mass gradual deterioration on the mechanism of post mining subsidence over shallow abandoned coal mines https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31929 Mon 09 Apr 2018 09:05:10 AEST ]]> A 3D discrete element modelling approach for rockfall analysis with drapery systems https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:16876 Mon 08 Jul 2019 16:24:28 AEST ]]> A step towards the end of the scale effect conundrum when predicting the shear strength of large in situ discontinuities https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45484 Fri 28 Oct 2022 14:50:20 AEDT ]]> Simulation of the nonlinear mechanical behaviors of jointed rock masses based on the improved discontinuous deformation and displacement method https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42594 Fri 26 Aug 2022 09:43:30 AEST ]]> Three-dimensional mineral grade distribution modelling and longwall mining of an underground bauxite seam https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32981 Fri 17 Aug 2018 15:43:48 AEST ]]> Predicting the fragmentation survival probability of brittle spheres upon impact from statistical distribution of material properties https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39500 m) and the scale parameter (here, the critical kinetic energy). The model is based on theoretically-derived conversion factors used to turn the critical work required to fail disc samples in quasi-static indirect tension into the critical kinetic energy to cause failure of spheres at impact in drop tests. The mechanistic conversion factors specifically account for the shape and size of the specimens tested and the increase of strength under dynamic loading (strain rate effect). Three series of drop tests were conducted (on spheres of three different diameters) and complemented by extensive material characterisation testing in order to validate the novel predictive model. The variability of material properties was characterised, and it was found that the material strength found by the characterisation tests generally follows a Weibull form, but the survival probability distribution of the drop tests seems to be linear. The predicted conversion factors were first compared against their experimental counterparts before validating the prediction of survival probability of the spheres upon dynamic impact (in drop tests). It was found that it is possible to predict the survival probability of artificial rock of three different diameters (50 mm, 75 mm, 100 mm) and two different strengths upon impact solely from the statistical information coming from Brazilian tests and with an average relative error of less than 9%.]]> Fri 10 Jun 2022 14:46:30 AEST ]]> Dynamic Mohr-Coulomb and Hoek-Brown strength criteria of sandstone at high strain rates https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47877 Fri 03 Feb 2023 15:31:58 AEDT ]]>