Estimation of Elastic Modulus of Rock Using Modified Point-Load Test

Zhao, Tianfeng; Fang, Kai; Wang, L.; Zou, Jun; Ma, Wei

doi:10.1520/gtj20160156

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…e obtained elastic section of load-penetration depth relationship and elastic modulus was used to make a back-calculation of shape coefficient. Furthermore, the influence of Poisson's ratio can be neglected [4]. Poisson's ratio of red sandstone is used for different types of rock.…”

Section: Influence Of Confining Pressure On Shape Coefficientmentioning

confidence: 99%

“…erefore, a method which can measure the elastic modulus quickly and conveniently is necessary. Several attempts have been made to develop methods to evaluate the elastic modulus indirectly, such as nanoindentation, needle penetration test, point load test, Brazilian splitting test, and so on [2][3][4][5]. Moreover the Smith rebound tester and borehole elastic modulus method can also measure the modulus effectively in situ [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Determination of Shape Coefficient in Elastic Modulus Estimation with Penetration Test

Zhao

Mao

Fang

et al. 2021

Advances in Civil Engineering

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Elastic modulus is a significant parameter in design and construction for rock engineering. Rock penetration test as a convenient method to evaluate the modulus of rocks has a great potential to be used. Based on the elastic theory, the relationship between rock penetration behavior and elastic modulus was established. In order to evaluate the elastic modulus, the shape coefficient is an important parameter to be determined. However, due to many factors, the value of this parameter is still uncertain. To provide a better insight into the shape coefficient and its factors, a series of penetration tests which used several types of rock samples with different sizes were conducted to study the determination of shape coefficient under different conditions. The test results show that sample size influences the shape coefficient, and with the increase in size, the shape coefficient decreases gradually to a stable value. In contrast, confining pressure has less effect on shape coefficient, and in the moderate and low stresses region, a fixed value can be selected for the test. Different types of rocks correspond to different shape coefficients. The shape coefficient of hard rock is higher than that of soft rock. Shape coefficient should be selected reasonably according to the penetration depth in practical application, and the reason, furthermore, why back-calculated shape coefficient deviates from the theoretical value is also discussed.

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Section: Influence Of Confining Pressure On Shape Coefficientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of Shape Coefficient in Elastic Modulus Estimation with Penetration Test

Zhao

Mao

Fang

et al. 2021

Advances in Civil Engineering

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“…In this method, it is assumed that the damage variable of the micro Young’s modulus of the whole model conforms to the same equation, which is suitable for the inversion of Young’s modulus field of homogeneous materials such as graphite. However, for rock materials affected by the diagenetic process, in-situ stress environment, engineering construction disturbance and specimen processing, the rock before the test has certain initial damage, and the microparameters and macroparameters have obvious discreteness [ 26 , 27 , 28 ]. The parameter damage of elements of the specimen is difficult to be described by the same quantitative equation.…”

Section: Introductionmentioning

confidence: 99%

Inversion Method of the Young’s Modulus Field and Poisson’s Ratio Field for Rock and Its Test Application

et al. 2022

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As one typical heterogeneous material, the heterogeneity of rock micro parameters has an important effect on its macro mechanical behavior. The study of the heterogeneity of micro parameters is more important to reveal the root cause of deformation and failure. However, as a typical heterogeneous material, the current testing and inversion method is not suitable for micro parameters measurement for the rock. Aiming at obtaining the distribution of micro Young’s modulus and micro Poisson’s ratio of the rock, based on the digital image correlation method (DIC) and finite element method (FEM), this paper proposed a parameter field inversion method, namely the DF-PF inversion method. Its inversion accuracy is verified using numerical simulation and laboratory uniaxial compression test. Considering the influences of heterogeneity, stress state and dimension difference, the average inversion error of Young’s modulus field and Poisson’s ratio field are below 10%, and the proportion of elements with an error of less than 15% accounts for more than 86% in the whole specimen model. Compared with the conventional measuring method, the error of macro Young’s modulus and macro Poisson’s ratio calculated by the DF-PF inversion method is less than 2.8% and 9.07%, respectively. Based on the statistical analysis of Young’s modulus field and Poisson’s ratio field, the parameter homogeneity and quantitative function relation between the micro parameter and the principal strain can also be obtained in laboratory tests. The DF-PF inversion method provides a new effective method of testing Young’s modulus field and Poisson’s ratio field of the rocks under complex stress states.

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“…[1][2][3][4][5] During coal mining, roof failures, landslides, spalling, ribbing, and other accidents often occur, [6][7][8][9][10][11] which not only affect the efficiency of the coal mining process but also pose serious threats to coal miners. [12][13][14][15][16][17] Therefore, to prevent such events, highly effective reinforcement materials for crushed coal mine rocks must be used. [18][19][20][21] Currently, the reinforcement of broken coal rocks is performed mainly through grouting.…”

Section: Introductionmentioning

confidence: 99%

“…Supporting and reinforcing the roof structures utilized in the mining industry are important safety measures . During coal mining, roof failures, landslides, spalling, ribbing, and other accidents often occur, which not only affect the efficiency of the coal mining process but also pose serious threats to coal miners . Therefore, to prevent such events, highly effective reinforcement materials for crushed coal mine rocks must be used …”

Section: Introductionmentioning

confidence: 99%

Effects of different catalysts on the structure and properties of polyurethane/water glass grouting materials

Zhang

et al. 2018

J of Applied Polymer Sci

114

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Polyurethane/water glass (PU/WG) grouting materials were prepared in presence of different proportions of catalyst. The effects of catalyst on the mechanical properties, thermal properties, and chemical cross‐sectional morphologies of the grouting materials were also investigated. Catalyst addition can significantly increase the chemical reaction rate, reduce the gel time and curing time, and improve the thermal stability of PU/WG grouting materials. It was found that the grouting material containing 0.1 wt % BDMA + 0.1 wt % DBTDL demonstrated high fluidity, short curing time, and high early‐stage and late‐stage (up to 66.1 MPa) compression strengths. However, when the content of the added catalyst was equal to 0.5 wt %, fine cracks were formed in the material structure accompanied by the detachment of spherical particles from the PU matrix, which significantly deteriorated its mechanical properties. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46460.

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Estimation of Elastic Modulus of Rock Using Modified Point-Load Test

Cited by 9 publications

References 6 publications

Determination of Shape Coefficient in Elastic Modulus Estimation with Penetration Test

Determination of Shape Coefficient in Elastic Modulus Estimation with Penetration Test

Inversion Method of the Young’s Modulus Field and Poisson’s Ratio Field for Rock and Its Test Application

Effects of different catalysts on the structure and properties of polyurethane/water glass grouting materials

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