scholarly journals Size Effect of the Number of Parallel Joints on Uniaxial Compressive Strength and Characteristic Strength

Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 62
Author(s):  
Gaojian Hu ◽  
Gang Ma ◽  
Jie Liu ◽  
Kuan Qi
Keyword(s):  
Numerical Simulation ◽  
Compressive Strength ◽  
Size Effect ◽  
Mathematical Models ◽  
Numerical Simulations ◽  
Uniaxial Compressive Strength ◽  
Special Functions ◽  
Characteristic Size ◽  
Characteristic Strength ◽  
Rock Size

The number of parallel joints has an impact on the size effect of the uniaxial compressive strength and characteristic strength of a rock; however, the relationships between them are yet to be derived. We studied the influence of the number of joints and rock size on the uniaxial compressive strength of the rock. This study established ten numerical simulation programs using numerical simulations and the RFPA software. Stress–strain curves of different numbers of parallel joints and sizes of rocks were analyzed. Relationships between the uniaxial compressive strength and number of parallel joints and rock size were proposed, and their special functions were obtained. Mathematical models between rock characteristic size, rock characteristic strength and the number of parallel joints were established. Simulations of the verification program confirmed that these relationships are still applicable after the angle of parallel joints changes.

scholarly journals Research on the size effect of roughness on rock uniaxial compressive strength and characteristic strength

2021 ◽  
Vol 28 (1) ◽  
pp. 613-627
Author(s):  
Gaojian Hu ◽  
Yu Li ◽  
Gang Ma
Keyword(s):  
Compressive Strength ◽  
Size Effect ◽  
Uniaxial Compressive Strength ◽  
Strain Curve ◽  
Characteristic Size ◽  
Roughness Coefficient ◽  
Joint Roughness ◽  
Characteristic Strength ◽  
Relationship Of ◽  
The Relationship

Abstract The joint roughness has an influence on the uniaxial compressive strength (UCS) and characteristic strength of the rock, but the relationship of the influence is yet to be obtained. In this article, the influence of the size of the rock with rough joints on the UCS and the influence of the size effect of roughness on the UCS are studied by establishing 11 sets of numerical simulation schemes, a total of 30 working conditions. The stress–strain curve law of rocks with different roughness and sizes is analyzed, and the relationship between UCS and the size of rock with rough joints, joint roughness coefficient (JRC), is respectively proposed. Mathematical models of rock characteristic size of UCS, characteristic strength of the rock, and JRC are established, respectively.

scholarly journals Size effect of parallel-joint spacing on uniaxial compressive strength of rock

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257245
Author(s):  
Gaojian Hu ◽  
Gang Ma
Keyword(s):  
Mathematical Model ◽  
Compressive Strength ◽  
Size Effect ◽  
Uniaxial Compressive Strength ◽  
Strength Characteristic ◽  
Characteristic Size ◽  
Stress Strain ◽  
Joint Spacing ◽  
The Relationship

The existence of parallel joints has an impact on the size effect of the uniaxial compressive strength of rock, but the relationship is yet to be obtained. In this paper, the influence of parallel-joint spacing on the size effect and characteristic size of rock uniaxial compressive strength is studied by establishing five types of parallel-joint-spacing simulation schemes. The influence of parallel-joint spacing on the size effect of rock uniaxial compressive strength is explored by analyzing the stress–strain curves of rocks with different parallel-joint spacings and rock sizes. The relationship between the uniaxial compressive strength and the size of the rock with parallel joints and its special mathematical model are obtained, and the particular form of the compressive-strength characteristic size and parallel-joint spacing is obtained.

Numerical Simulation of Influence of Mudstone Interlayer on Compressive Strength of Salt Rock

2012 ◽  
Vol 512-515 ◽  
pp. 1953-1956
Author(s):  
Feng Shan Han ◽  
Song Li
Keyword(s):  
Numerical Simulation ◽  
Compressive Strength ◽  
Natural Gas ◽  
Radioactive Waste ◽  
Mechanical Behavior ◽  
Uniaxial Compressive Strength ◽  
Failure Process ◽  
Physical Experiment ◽  
Salt Rock ◽  
Oil And Natural Gas

Salt rock is think of ideal storage location for oil and natural gas and radioactive waste deposited, interlayer has negative effect on stability of cavern of storage for oil and natural gas and radioactive waste deposited in salt rock, It is difficult to make complete specimen layered salt rock with interlayer. In this paper Based on Rock Failure Process Analysis Code RAFP2D, influence of mudstone interlayer on uniaxial compressive strength of salt rock is investigated by numerical simulation. Numerical simulation shown that when mechanical parameters such as elastic modulus poison’s ratio and uniaxial compressive strength for salt rock and pure mudstone interlayer and content of mudstone interlayer in salt rock are known, compressive strength and mechanical behavior for salt rock with mudstone interlayer can be effectively and accurately analyzed using RFAP2D. The results for numerical simulation are agreement with true physical experiment of salt rock with mudstone interlayer. It should be noticed that the true physical experimental uniaxial compressive strength of rock is in range of 30% mean uniaxial compressive strength of rock element in RFPA2D，in this case the results for numerical simulation can reflect phenomenon and behavior for true physical experiment of salt rock with mudstone interlayer. That provides new method and avenue to analyze and investigate mechanical behavior for multilayer rock mass based on RAFP2D

scholarly journals Structure and compressive behavior of Lightweight Clay Aggregate particle: experiments and numerical simulations

2021 ◽  
Vol 249 ◽  
pp. 11016
Author(s):  
Shuangshuang Xia ◽  
Zhifu Shen ◽  
Hongmei Gao ◽  
Zhihua Wang
Keyword(s):  
Compressive Strength ◽  
Numerical Simulations ◽  
Internal Structure ◽  
Uniaxial Compressive Strength ◽  
Particle Crushing ◽  
Compressive Behavior ◽  
Granular Particle ◽  
Negative Role ◽  
Highly Porous ◽  
Geotechnical Application

Lightweight Clay Aggregate (LWCA) is a kind of highly porous granular particle which is often used as lightweight backfilling geomaterials. However, the easy breakage of LWCA particle plays a negative role in its geotechnical application. This study focuses on the internal structure and compressive behavior of single LWCA particle using experiments and numerical simulations. The uniaxial compressive strength and loading stiffness of the LWCA particle is attributed to its special porous internal structure. The results could enrich our understanding in particle crushing.

scholarly journals Numerical Simulation of Size Effects on Countercurrent Flow Limitation in PWR Hot Leg Models

2012 ◽  
Vol 2012 ◽  
pp. 1-7
Author(s):  
I. Kinoshita ◽  
M. Murase ◽  
A. Tomiyama
Keyword(s):  
Numerical Simulation ◽  
Size Effect ◽  
Numerical Simulations ◽  
Size Effects ◽  
Fluid Model ◽  
Flow Channel ◽  
Countercurrent Flow ◽  
Flow Limitation ◽  
Two Fluid Model ◽  
Two Fluid

We have previously done numerical simulations using the two-fluid model implemented in the CFD software FLUENT6.3.26 to investigate effects of shape of a flow channel and its size on CCFL (countercurrent flow limitation) characteristics in PWR hot leg models. We confirmed that CCFL characteristics in the hot leg could be well correlated with the Wallis parameters in the diameter range of0.05 m≤D≤0.75 m. In the present study, we did numerical simulations using the two-fluid model for the air-water tests withD=0.0254 m to determine why CCFL characteristics forD=0.0254 m were severer compared with those in the range,0.05 m≤D≤0.75 m. The predicted CCFL characteristics agreed with the data forD=0.0254 m and indicated that the CCFL difference betweenD=0.0254 m and0.05 mm≤D≤0.75 mm was caused by the size effect and not by other factors.

Effect of Prandtl Number in Turbulent Buoyant Jet Simulation

2013 ◽  
Vol 631-632 ◽  
pp. 1001-1005
Author(s):  
Shao Bo Wang ◽  
Shen Guang Fang ◽  
Li Qin Cui
Keyword(s):  
Numerical Simulation ◽  
Prandtl Number ◽  
Mathematical Models ◽  
Numerical Simulations ◽  
Numerical Results ◽  
Two Dimensional ◽  
Turbulent Prandtl Number ◽  
Buoyant Jet ◽  
Reasonable Range ◽  
Axial Concentration

Turbulent Prandtl number used in numerical simulation has effect on exact prediction of velocity and heat transferring with two dimensional buoyant mathematical models. Various Prandtl number values advised by experiments are used to study its effect on numerical results approaching to real ones with model under axisymmetric coordinate. It shows that axial velocities can’t be affected by using various values of of Prandtl number in numerical simulations and can be predicted well. However, it affects the exact prediction of axial concentration to extent, and a smaller value of Prandtl number tends to forecast a smaller axial concentration than real one, and vice versa. A reasonable range of turbulent Prandtl number for various Reynold numbers was suggested.

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