The relationship among rock crushing energy, the …
Download Citation | The relationship among rock crushing energy, the Protodyakonov coefficient and rock strength | To study the relationship between the power and energy of rock crushing in ...
Download Citation | The relationship among rock crushing energy, the Protodyakonov coefficient and rock strength | To study the relationship between the power and energy of rock crushing in ...
The crusher type showed significant effects on the aggregate form.. The rock type showed important effects on the texture of coarse aggregate. • The effect of the crusher type on the characteristics of shape is more in the marble and less in the tuff aggregates.. Aggregate produced from HSI showed a higher cubical form, angularity, …
The effects of rock strength on the crusher performance can be attributed to the stiffness of rock and also refer to the state of stress at which a rock specimen or …
Uniaxial compressive strength, Brazilian tensile strength and density of rock are most commonly measured rock properties performing for almost any type of rock engineering project. Conducting these strength tests in the laboratory is relatively easy and inexpensive in comparison with punch penetration test that needs specific equipment to ...
The objective was to quantitatively investigate the effect of confining pressure and rock strength on the indentation crushing characteristics of deep hard rocks. The results indicate that as the confining pressure increases from 5 MPa to 20 MPa, the dimensional parameters such as volume, diameter and depth of the impact groove decrease ...
One of the main reasons is that the two models are a single crushing mode, and the rock strength considered is a fixed static value. Specific energy optimization interval is difficult to obtain. For the composite mode model of this paper, with the increase of the dynamic intensity ratio, the specific energy increases nonlinearly, and the ...
In fact these contacting points may be close to their crushing strength, such that similar shear strength equations apply: ... Recognition of the need to improve the M-C and other (non-linear) shear strength criteria for the intact strength of rock has led researchers at the University of Roorkee to incorporate a simple critical state concept ...
The reason is that with the increase of confining pressure, the strength of rock increases gradually, and the upper limit of rock failure strength increases gradually. At this time, the influence of tooth shape on rock breaking efficiency decreases gradually. ... it can be seen that the rock-crushing area after the intrusion of the spherical ...
Estimating the UCS of rock using drilling parameters is also an alternative method. In this method, continuous measurement of drilling parameters and evaluating …
Strength indices such as point load index, impact strength index, aggregate impact value, aggregate crushing value and durability indices such as slake durability index, aggregate abrasion value are the furthermost parameters being evaluated and applied for engineering structures, building stones and construction aggregates.
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 …
The Rude Rock team includes a versatile group of strength and conditioning coaches and practitioners who specialize in athlete return to play and injury restoration. Rude Rock helps athletes and individuals …
This paper aims to focus permeability study of self-compacting concrete (SCC) made with industrial wastes, i.e., marble sludge powder (MSP) from marble processing and crusher rock dust (CRD) from stone crushing industries. MSP can be used as filler and it helps to reduce the total voids content in concrete.
The most important rock properties are those which reflect these processes. Rock properties can be grouped into three classes: (a) Properties which measure the …
Mechanical properties of rocks, especially the uniaxial compressive strength (UCS), have significant impact on the stability of surrounding rock, 1, 2 tunnel boring machine (TBM) performance 3, 4 and the rockburst tendency. 5, 6 The uniaxial compressive test (UCT) is performed in a laboratory environment and the precise UCS …
Under the optimal combination of vibration parameters, it still needs 1–3 min to degrade the rock strength [42] by approximately 10–30 %.Thus, there is still a potential improvement to be realized with the goal of efficient rock breaking: the rock can be weakened on time/instantaneously during drilling/exploration, but not in the order of …
Rock mass possesses a complex structural hierarchy. The size effect on the strength of geomedia is closely related to the structural hierarchy of rock mass. This paper demonstrates that the rock mass strength sensitivity to strain rate may be regarded as the result of competition between the coexisting thermally activated and macro-viscous …
General rock failure criterion can be reduced to a few parameters dependent on lithology (m) and the uniaxial compressive strength (C0). 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 C0. C0can be estimated from p…
The crushing time (T c) seems to increase with increasing in rock strength properties. Furthermore, remarkable relationships are obtained between several rock properties and crushability test results.
Static crushing agent (SCA) offers advantages such as good safety, no harmful gases, and minimal vibration, making SCA ideal for rock crushing in mines or underground engineering. To scientifically implement the section expansion of mine roadway, the rock mechanical parameters, SCA expansion properties, and cracking …
Particle crushing is a fundamental issue in the analysis of the deformation and failure behaviour of rockfill materials. The impact of morphology on the crushing behaviour of granite particles is investigated via a series of in-situ X-ray micro-CT tests and DEM simulations. Single-particle crushing tests are performed on rock particles of …
Uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), and brittleness are widely used in rock engineering applications. However, preparing the test samples for the standard tests may not always be possible for weak or soft rocks. On the other hand, only rock fragments may be available to estimate the rock strength in …
A crushing strength model, by combining an analytical solution and the Weibull statistics, was then proposed to predict the particle size and the environmental factors on the characteristic crushing strength of rockfill grains. ... The physical property of the tested material is poor since the average uniaxial compressive strength of the rock ...
To study the effect of rock crushing strength, the lowest and highest rock crushing strengths of 20 MPa and 50 MPa were adopted to carry out the numerical parametric study. This selected range covers the. Effects of rock crushing strength. The crushing strength of the rocks used in the gabions in the field may vary depending on …
The invention discloses a mechanics calculation method of drill bit tooth considering rock dynamic strength and mixed crushing mode, including: Step S 1 : selecting a target dr
Additionally, several studies have been conducted on the post-peak shear strength of rock mass structural planes. For instance, ... The failure mode of the shear failure and the compression-induced fracture phenomenon was accompanied by tension and crushing, which was considerably different from the slip failure and pure shear …
The rock uniaxial compressive strength (UCS) is the basic parameter for support designs in underground engineering. In particular, the rock UCS should be obtained rapidly for underground engineering with complex geological conditions, such as soft rock, fracture areas, and high stress, to adjust the excavation and support plan and …
"Case study: Using the point load test to estimate rock strength of tunnels constructed by a tunnel boring machine." Bull. Eng. Geol. Environ. 78: 1727–1734. Crossref. Google Scholar. Mishra, D. A., and A. Basu. 2012. "Use of the block punch test to predict the compressive and tensile strengths of rocks."
Firmness is one of the most important physical properties of rock, and indicates the rock's ability to resist damage. It has considerable relevance to mining, blasting, tunneling, construction, and other engineering fields. In this study, the fractal particle-size-distribution theory was used to calculate the surface areas of coal particles …
The lump test, point load test, crushing tests, impact tests and hardness tests are critically reviewed. The fundamental aspects of importance, namely the dependence of the energy required to break rock on the new surface area created for some processes, and on the test specimen volume for other processes, are considered and shown to be …
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