... University, Melbourne, Victoria, Australia ABSTRACT: A series of uniaxial compressive strength tests were performed to study the deformation charac- teristics of bedded sandstone with bedding layers in different orientations. Test results revealed that the samples with bedding layers oriented in smaller...

... 2001; Kurakami et al. 2008). When good practice is in place, CRF enables achieving good ground control by reducing footwall and hanging wall slough while mining adjacent stopes. It also provides a solidworking surface for mining upper levels. Stiffness and strength of CRF by and large govern its...

..., Schmidt hammer and uniaxial compressive strength values are used to predict the field performance of chain saw machines. Natural stone quarries are visited in Turkey in order to measure the field performance of chain saw machines. Different natural stone samples are obtained from different quarries...

...: energy input, energy accumulation, energy dissipation and energy release. Thermal damage defined by elastic modulus increases generally but has volatility, which can be fitted into cubic curve. Rock strength shows inverse ratio to dissipated energy and proportional ratio to elastic energy, energy...

... Abstract By the experimental study on the physical and mechanical properties of typical rock in the Liuzuo Copper Mine, the base physical parameter and main mechanical parameters such as elasticity modulus, poisson's ratio, compressive strength and shear strength parameters is put forward...

... of rock compressive strength, density, cohesion force and internal friction angle. According to the rock classification standard, drilling data and real rock mass basic quality index (abbreviation BQ), the relationship between the drilling rate and BQ is also established, and the classification table...

... and the shear strength of the joint are subject to the joint roughness under the medium normal stress (Byelee 1978). With the different roughness, the failure mechanism of the rock joint has changed (Patton 1966). And the rock shear failure mechanism proposed by Barton reflects the influence of the joint...

... the wellbore, therefore, the natural mechanical properties or the strength of the swollen shales will decrease causing serious hole problems such as undergauge hole, stuck pipe, overpull on trips, and several other problems. Thus swelling stresses and rock strength reduction must be included in any attempt...

.... It is shownby numerical tests that the different internal meso-structure distribution can have considerable effects on the compressive strength, crack initiation stress and stress-strain relationship, and other macro-properties. The micromechanical behavior of rock samples is affected by the distribution...

... Abstract The objective of the study was to investigate the effect of strength heterogeneity on fracture patterns observed under laboratory conditions in hollow cylinder fracturing tests. The finite-element method with cohesive elements representing potential fracture sites was used. The number...

... AE count rate and energy rate are linear growth with time increasing, thenardite AE count rate and energy rate increase rapidly; at the peak strength, halite and thenardite AE count rate and energy rate reach the maximum at the same time; after the peak strength, there are still AE counts and a few...

... Abstract Thirty six slopes, which are constituted by limestone, in Longshan Quarry of Anning City have been studied in order to get a new method to determine the shearing strength for limestone. Through comparison the parameter error between the site shearing test and the calculated value...

... Abstract The surface damage and evolution of gouge materials in rock fractures or faults undergoing shear can change fracture properties in terms of shear strength and dilation, fluid transmissivity and retardation for contaminants. In order to conceptually understand fracture surface damage...

... compression test were carried out by using serve-control rock mechanics test system, through the stress and strain curve and failure characters of rock specimens, in order to analyze the influence of strength and deformation with different fissure angle and length under different confining pressures...

... on the compression test results of limestone specimen in multiaxial conditions by Hou, Yun et al., it is found that the intermediate principal stress can obviously affect the strength of rock (2008, 2009). Considering different loading path, loading velocity and specimen size, biaxial test have been carried out...

..., as Mogi-Coulomb strength criterion can better describe the failure features of rocks under high geostress and rock micro-unit strength obeys the Weibull distribution, a new statistical damage constitutive model is established. Then, comparing the new model based on Mogi-Coulomb criterion with the Drucker...

..., but the distribution and strength of joints greatly affect the stability of the rock slope. Anchor is a common approach to reinforce the jointed rock slope, and anchor plays an important role in the crack propagation and deformation of jointed rock. Thus, researches for the effects of anchor on jointed rock...

... muck-piling after failure. Upstream Oil & Gas propagate fragment muck-piling rock failure progressive process Wellbore Design strength hybrid finite-discrete element method fracture fracture pattern primary fracture rock failure resultant fragment muck-piling hydraulic...

... Abstract Natural rocks often contain a large number of microfissures that have great effect on the deformation, strength and failure mechanism of rocks. The engineering construction will change the stress magnitude and stress state, thus causing microfissure to propagate until a macroscopic...

... or alteration depending upon the physical and chemical process involved. Weathering transforms hard rocks into soft rocks which maintain the structure of the intact rocks, but are characterized by higher void ratios and reduced bond strengths. Soft rocks are transformed into thick granular soil mantles...