The Influence of the Dimensions of Specimens on the Fracture Strength …
Semantic Scholar extracted view of "The Influence of the Dimensions of Specimens on the Fracture Strength of Rocks : Comparison between the Strength of Rock Specimens and that of the Earth's Crust" by K. Mogi
The Influence of Geological Factors on the Strength of Coal Measure Rocks
A study has been made in the laboratory of the strength of a "suite" of coal measure rocks in uniaxial and triaxial compression. From the data obtained it is demonstrated that the compressive strengths are profoundly influenced by the composition, porosity and degree of compaction of the rocks.
Strength of rocks | SpringerLink
Strength of a given rock type is strongly influenced by physical parameters such as temperature, confining pressure, fluid pressure, and the length of time the stress is applied. For the effects of such parameters and tabulations of various types of strengths for a …
Influence of Joint Roughness on the Shear Behaviour of …
where T = shear force obtained in the test, T N = shear strength of the natural unbolted joint, P = ultimate tensile strength of the rock bolt, s = shear displacement obtained in the test, and d b = bolt diameter.. The evolutions of maximum f T and maximum f s with the increasing of joint roughness are shown in Fig. 3.The intermediate value of …
(PDF) Influence of explosive energy on the …
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. ... The different …
STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES
In general, compared to intact rock, a rock mass has reduced tensile strength (almost zero), and reduced shear strength especi ally along discontinuity planes. Furthermore, if a rock mass is cut by directional joint sets, the rock mass strength is anisotropic. Rock mass strength is scale dependent and varies with the volume of rock under ...
GEOLOGICAL INFLUENCES ON THE STRENGTH …
geological influences on the strength of rocks and implications on brittle rock mass behavior jeffrey anangkaara ganye a thesis submitted to the faculty of graduate studies …
Rock Strength
Rock strength is specified in terms of tensile strength, compressive strength, shear strength, and impact strength. In the context of fracture gradient, only the tensile …
Shear strength of rock joints influenced by compacted infill
A silty clay (25% fine sand and 75% kaolinite) with a liquid limit of 39 and a plastic limit of 20 was used as the infill material. The shear strength behaviour of the infill material under saturated conditions was studied using a direct shear box apparatus (AS 1289.6.2.2 [15]), and a friction angle of ϕ′=21° and a cohesion intercept (c′) of 13.4 kPa …
The Impact of Shear Rate on the Mechanical Behavior of Rock …
The shear rate is an important factor that influences the shear mechanical properties of rock joints. In this paper, constant normal load (CNL) direct shear tests at different shear rates ( $${v}_{s}$$ v s = 0.2–5.0 mm/min) were performed on rock joint specimens to investigate the shear behavior and failure modes under various joint …
Influence analyses of joint length on rock mass strength
In this study, in order to conduct the investigations mentioned above, the distinct element method (UDEC software) was proposed for stress analyses at the two-dimensional level to apply to rock ...
A Review of the Tensile Strength of Rock: Concepts and …
The clustering suggests that even though the specimens are all meta-granites, natural variability at the same project site influences the strength of the material. Further study is required to explore how natural variability within a specific rock type influences the relationships examined in the paper.
Influence of degree of interlock on confined strength of jointed hard
The strength of a rock block is influenced by the strength of the intact part of the block as well as the strength of discrete defects (e.g. veins) within a block. In a highly interlocked jointed rock mass at low confinement, the high rock block strength causes geometric dilation, resulting in a rapid increase in the confined strength and thus ...
Influence of rock falls, rock strength, and joint orientation on
Rock strength is based on the spacing, width, and orientation of joints. Joint spacing will influence the size of the debris that will fall from the wall. Larger boulders fall less frequently, require more force to be moved, and tend to occur when joints are widely spaced. Small spaces between joints create smaller particles which are easier to ...
Influences of petrographic and textural properties on the strength …
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 …
Assessing Mechanical Properties and Response of …
This study investigates the dynamics of moisture absorption and swelling in soft rock during tunnel excavation, emphasizing the response to support resistance. …
Strength and Deformation Characteristics of Rocks
Rock mechanical properties mainly refer to the deformation characteristics of rocks and the strength of rocks. Since wellbore stability, sand production, hydraulic fracturing, and reservoir physical properties changes are closely related to rock mechanical properties in petroleum engineering, it is necessary to study the mechanical properties of …
Influence of surface roughness and hydrophilicity on bonding strength …
The good bonding in a concrete-rock interface is an important premise to perform the supporting functions of concrete and shotcrete. However, the bonding strength of a concrete-rock interface is influenced by many factors such as rock mineral composition and textural features, surface roughness, interface treatments, and concrete …
Tensile Strength of Rock Under Elevated Temperatures
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 ).
Experimental investigation of the Rock–Concrete bi materials influence
Disk-shaped specimens after failure in splitting tensile tests; rock strength, ... due to concrete mixtures seems to have a certain influence on the tensile strength of the samples which especially fails by interface fracture at α = 0° and 15°, but no effect of adhesion on fracture pattern was observed at these low inclination angles. ...
Influence of rock percentage on strength and permeability …
The strength and permeability of tailing-waste rock mixtures directly affect deposits' stability for an alternative co-disposal technique. In the mixed co-disposal method, the void of the waste rock is filled with tailings, while the waste rock forms the particle skeleton. This method does not only improve deposits stability but also potentially …
Statistical damage model of rocks reflecting strain softening
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 stress …
Influence of rock strength on the mechanical behavior and …
DOI: 10.1016/J.JMRT.2021.03.059 Corpus ID: 233693861; Influence of rock strength on the mechanical behavior and P-velocity evolution of coal-rock combination specimen @article{Zhao2021InfluenceOR, title={Influence of rock strength on the mechanical behavior and P-velocity evolution of coal-rock combination specimen}, author={Tong-bin …
Influences of Loading Condition and Rock Strength to the …
Abstract. The influences of displacing angle, joint gap, and rock strength to the performance of rebar bolts and D-Bolts are evaluated in this study. A new method was developed to apply pull and shear loads to the bolt specimen in any combination so that a displacing angle can be established in the range from 0 (pure pull) to 90° (pure shear). In …
Influence of Asperity Morphology on Failure Characteristics …
The asperity morphology has profound influences on the failure characteristics and shear strength of rock joints. To investigate these influences, degradation characteristics and mechanical properties were studied based on direct shear tests conducted on six groups of artificial rock joints with regular profiles.
Compressive strength of rocks
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 …
Factors affecting the rate of weathering
There are two main types of weathering: mechanical (physical) weathering and chemical weathering. Both are influenced by the physical properties of rocks. Strength: Rocks with high strength are more resistant to mechanical weathering. Strength is the ability of a rock to withstand external forces without breaking or deforming.
Experimental study on influence of host rock strength on …
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 …
Influence of the strength of rock-like models on the local …
In order to investigate the influences of hardness and brittleness on rock-like materials' crushing behaviors, quartz sand and high strength α-hemi-hydrated gypsum were used to prepare rock-like ...
Influence of surface roughness and hydrophilicity on bonding strength …
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 …
