To improve understanding of this rarely studied issue and the influence of individual particle strength, this paper analyzes the size effect on rock aggregate crushing strength and its connection ...

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. ... (Xiao et al. 2019) on the crushing strength of rock gains have also been reported. However, the joint effects of ...

Rocks can be considered as three-phase systems in most cases. • Solid, liquid, gas. Most rocks contain some void space between grains. Voids are always filled with some type …

Similar to crushing strength, the Weibull modulus, m, of grain crushing strength follows an exponential law, in other words, m decreases with the disorder degree of porous texture.

Breaking strength or fracture strength, is the stress difference at fracture, and crushing strength is the uniaxial compressive stress required to break the sample under …

morphology and crushing strength, where the output is grain crushing strength and input are different shape descriptors. The influence of grain shape descriptors including form, roundness, sphericity is analyzed with the help of interpretable ML methods. 2 3D grain shape acquisition and quantification 2.1 Grain scanning

In this study, a discrete element method model was used to conduct a parametric study to investigate the combined effects rock shape (bulky and flaky) and crushing strength (20 to 50 MPa) on the ...

The size scaling law of crushing strength for the porous LECA particle does not obey the Weibull model prediction which was originally developed for solid particles. ... Oka Y (1966) Determination of tensile strength of rock by compression test of an irregular test piece. Int J Rock Mech Min 3:89–99. Google Scholar Holm TA, Valsangkar AJ ...

The suitability of the 4-parameter Weibull equation to describe size effects on the crushing strength reported in the literature is discussed. Furthermore, a Weibull statistical analysis was carried out for a wide number of experimental results on rock aggregates, where it has been observed that strength decreases with particle size.

Rock strength is characterized via a series of tests used in mining and associated areas.Certain rock strength parameters have been found to correlate closely with power consumption and product size.

So the crushing strength of the rock becomes important. 2. The asperities in contact on either side of a rock joint and the small contacting points around the rockfill particles appear to follow the same basic non-linear relation between shear strength and effective normal stress. Both materials dilate strongly at low stress, causing high ...

In compressive strength test. The crushing strength of concrete, determined by breaking a cube, and often called the cube strength, reaches values of about 3 tons per square …

The size-dependent crushing strength of single rockfill particles affects the mechanical behavior of rockfill materials. Understanding and capturing the size effect of single particle crushing strength accurately is essential to investigate the gradation evolution and the mechanism of the scaling effect of rockfill materials. However, …

Rock grains with diameters of 20–30 mm are tested in this study to eliminate the size effects on grain crushing strength. The grain size is defined as the equivalent diameter of a sphere with the same volume of the slate rock grain.

The degradation of rockfill materials in certain surrounding environments is directly related to the deformation of many important geotechnical structures. This study aims to systematically reveal the effects of temperature and relative humidity on the crushing strength of rockfill materials at the particle scale. To this end, a series of …

According to the International Society for Rock Mechanic (ISRM) standard, the granite rock sample may be classified as having very high strength and dolomite rock sample, low strength. Also, the granite rock has the highest crushing time (21.0 s) and dolomite rock has the least value (5.0 s). Based on the results of the investigation, it was ...

Lee (1992) examined the crushing strengths of limestones from different geographical origins and found that the crushing strength of a single particle generally increases with decreasing particle size (Chuhan et al., 2002; McDowell and Harireche, 2002), which is in accordance with the observation that, with increasing particle size and …

geology semester iv gt 403 –engineering geology and environmental geology unit 1.2 engineering properties of rocks unit 1.3 strength of rocks

For the rock strength considerations, the uniaxial compressive strength of rocks (UCS, MPa) is an essential parameter for quantifying rock crushability in jaw crushing (Korman et al., 2015 ...

Berry et al. (1984) determined some rock properties such as compressive and tensile strength, Young's modulus, porosity and attempted to correlate these to the performance of a jaw crusher. Bearman et al. (1991) examined the relation between rock strength and power consumption and product size in crushing. They showed that the tensile based ...

Fundamental research on single-particle breaking and the uniaxial compressive strength (UCS) of carbonaceous mudstone aggregates at different water contents was carried out to investigate the relationship between the single-particle crushing strength and UCS. Based on elasticity theory and the superposition principle, a shape …

The determination of crushing strength for particles with complex shapes was discussed, and it was found that it is appropriate to use the area equivalent circle diameter to obtain the crushing ...

The crushing strength of rock grains after deterioration will decrease (Manso et al., 2020, Zhou et al., 2021), a deterioration coefficient D R is used to define the ratio between the crushing strength of deteriorated and undeteriorated rock grains as D R = σ Rd / σ Ru (Shao et al., 2020).

By combining these results with the experimental results from the literature, the suitability of the Weibull model to describe the size effects on the breakage strength of rock grains is discussed. To understand why larger grains possess lower strength, a bonded particle model (BPM) is established in YADE to simulate the particle crushing …

Introduction The rock mass compressive strength is a measure of the peak load carrying capacity of a rock mass (i.e stress driven failure) and is likely to be a fraction of the intact rock ...

The size-dependent crushing strength of single rockfill particles affects the mechanical behavior of rockfill materials. Understanding and capturing the size effect of single particle crushing ...

During the last few years, thousands of tests have been carried out on rock strength in different parts of the world. ... Thus in crushing strength, they may be softer than a good brick (less than 200 kg/cm 2) or may be as strong as 1000-1500 kg/cm 2. A similar variation in other properties may also be observed in different types.

Therefore, developing some models for estimating the rock strength from rock fragments will be useful. In this study, a crushability index (CI) was described from …

The most important rock properties are those which reflect these processes. Rock properties can be grouped into three classes: (a) Properties which measure the …

• Strength classification is based on strength of the rock (compressive strength & modulus of elasticity; Table 7.2) • 5 strength classes: A-E based on the overall rock strength; A = very strong, E = very weak (Table 7.3) • Any discontinuities, fractures, bedding planes, etc. will strongly influence overall strength of the rock.