Point Load Test of Half-Cylinder Core Using the Numerical Model and Laboratory Tests: Size Suggestion and Correlation with Cylinder Core

Ren, Fengyu; Liu, Huan; He, Rongxing; Li, Guanghui; Liu, Yang

doi:10.1155/2018/3870583

Cited by 9 publications

(7 citation statements)

References 37 publications

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“…Second, the flat-joint model is selected in the bonded-particle model. Because it can be applied to hard rock, and larger ratio of uniaxial compression strength to tensile strength can be obtained [33]. As shown in Figure 2, the flat-joint contact simulates the behavior of an interface between two notional surfaces (called faces), each of which is rigidly connected to a piece of a body [32].…”

Section: Synthetic Rock Mass (Srm)mentioning

confidence: 99%

Numerical Analysis for the Caving Characteristics of Rock Mass with Inclined Joints in Caving Mining

Sui

Ren

Cao

et al. 2021

Advances in Civil Engineering

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In caving mining, the successful initiation and propagation of caving require one low-dip joint set. However, not every mine has a low-dip joint set. The Hemushan Iron Mine in China was taken as the engineering background, and the caving characteristics of rock mass with inclined joints were analyzed based on the synthetic rock mass (SRM) model. First, the inclined joints were investigated in the Hemushan Iron Mine. Second, model parameters were determined based on the geological conditions of the mine, and seven models were established. Third, the caving process was simulated, and caving characteristics were monitored. For rock mass with inclined joints after undercutting, the research showed that the crack zone was significant, and the crack zone existed not only around the undercut area but also further away in the model. The stress concentration areas dispersed in the model except for the top of the undercut area. The caving line was not a standard arch, and the highest point of the caving line was biased towards the direction of the undercut. Under the same undercut width, with the decrease of joint length in the joint system, the number of cracks decreased, the degree of stress concentration became weaker, and the height of the caving line decreased.

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Section: Synthetic Rock Mass (Srm)mentioning

confidence: 99%

Numerical Analysis for the Caving Characteristics of Rock Mass with Inclined Joints in Caving Mining

Sui

Ren

Cao

et al. 2021

Advances in Civil Engineering

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“…In the approaches of cavability assessment, the indices of the rock strength were the uniaxial compressive strength (UCS) or point load strength index (Is (50) ). Determining the Is (50) was a more practical, time-saving, and economical method compared to determining the UCS [30]. A large number of studies [31][32][33][34] have shown that the Is (50) has a good correlation with the UCS.…”

Section: Determination Of the Influencing Factors And Assessmentmentioning

confidence: 99%

A Fuzzy Comprehensive Assessment Approach and Application of Rock Mass Cavability in Block Caving Mining

Liu

Ren

et al. 2019

Mathematical Problems in Engineering

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Cavability assessment is an important subject during the feasibility stages before determining whether to use block caving mining. This paper provides a fuzzy comprehensive assessment (FCA) approach based on the cavability assessment approaches and its influencing factors, which are all fuzzy. This approach combines the cavability influencing factors with engineering empirical approaches by fuzzy mathematics, which improves the applicability of the cavability assessment results. This approach is applied to assess the cavability via cores in the Luoboling copper molybdenum mine. The spatial distribution of the rock mass cavability at different depths of the borehole is obtained. The cavability ranks of various rocks are determined in different locations. These assessment results can provide a basis for demonstrating the feasibility of block caving mining in the Luoboling copper molybdenum mine. The study can also provide a basis for the design of mining engineering.

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“…Also, there are many studies in the literature that were researched the relationships between PLI and other rock properties. Ren et al [32] established a correlation of failure load between half-core and core samples with a fit size suggestion and size correction factor. Mesutoğlu and Özkan [33] made a study to determine the material characteristics of coal and inner burdens using relationships between the Schmidt hardness and PLI values.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the availability of a new point load test device in characterization of rocks

Akbay

Altındağ

2021

International Advanced Researches and Engineering Journal

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Difficulties in determining rock properties have led to the developed and increased use of index test methods predicting them. Index test methods are mostly simple, cheap, and easy to apply but there are some restrictions due to these specifications. The most used method to determine the strength values of rocks indirectly is the point load index. The main aim of this study is primarily investigating the usability of modified test device instead of classical test device. For this, laboratory tests were carried out on rocks with different strength values (3 igneous, 1 metamorphic, 3 sedimentary). The point load index tests were carried on 15 different classical test devices and on a modified test device which the limitations of the classical test device were eliminated. Analysis of the obtained results was carried out by the simple regression method. It was determined the modified test device can be used reliably instead of the classical test devices. Besides, while determining the strength tests the stress distributions on the samples were examined with the finite element method.

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Point Load Test of Half-Cylinder Core Using the Numerical Model and Laboratory Tests: Size Suggestion and Correlation with Cylinder Core

Cited by 9 publications

References 37 publications

Numerical Analysis for the Caving Characteristics of Rock Mass with Inclined Joints in Caving Mining

Numerical Analysis for the Caving Characteristics of Rock Mass with Inclined Joints in Caving Mining

A Fuzzy Comprehensive Assessment Approach and Application of Rock Mass Cavability in Block Caving Mining

Investigation of the availability of a new point load test device in characterization of rocks

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