Measurement of the basic friction angle of rock by three different tilt test methods

2014 ◽  
pp. 261-266 ◽  
Author(s):  
J Ruiz ◽  
C Li
Keyword(s):  
Friction Angle ◽  
Test Methods ◽  
Tilt Test ◽  
Basic Friction Angle

scholarly journals The Friction Angle of the Leiyang Marble Surface after Exposure to High Temperature

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Meng Hong Peng ◽  
Man Huang
Keyword(s):  
Surface Condition ◽  
Surface Friction ◽  
Friction Angle ◽  
Effect Of Temperature ◽  
Tilt Test ◽  
Rock Surface ◽  
Sliding Angle ◽  
Normal Loading ◽  
Basic Friction Angle ◽  
Marble Surface

There is a lack of information about the temperature-dependent nature of the rock surface, which is one of the essential parameters to predict the surface friction. In the present study, we experimentally study the effect of temperature on the basic friction angle of the marble surface through the direct shear test under the low normal loading condition and tilting test (Stimpson/disk tilt test). The basic friction angle gradually decreases with the increase in temperature from 20°C to 600°C for the two kinds of the tilting test. The results indicate that the Stimpson test on samples with the length-to-diameter ratio of 2 can be more reliable to estimate the basic friction angle of the rock surface after exposure to high temperatures. The results illustrate that the sliding angle depends on the surface condition. With the increase in the repetitive measurements, the sliding angle decreases as the marble surface is cleaned, and the parameter increases as the marble surface is not cleaned.

Experimental Studies on the Basic Friction Angle of Planar Rock Surfaces by Tilt Test

2018 ◽  
Vol 47 (1) ◽  
pp. 20170308 ◽  
Author(s):  
Ning Zhang ◽  
Charlie C. Li ◽  
Aizhong Lu ◽  
Xuguang Chen ◽  
Dejun Liu ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Friction Angle ◽  
Tilt Test ◽  
Basic Friction Angle

scholarly journals Determination of the basic friction angle ϕb of joints using the field tilt test: results of various “fast” tests on outcrops

2021 ◽  
Vol 833 (1) ◽  
pp. 012048
Author(s):  
L Jordá-Bordehore ◽  
L Alejano ◽  
R Tomás ◽  
S C Loaiza ◽  
M T García ◽  
...  
Keyword(s):  
Friction Angle ◽  
Tilt Test ◽  
Test Results ◽  
Basic Friction Angle

Test Methods for Measuring Mechanical Parameter of Simulated Lunar Dust

2013 ◽  
Vol 333-335 ◽  
pp. 389-393
Author(s):  
Man Li ◽  
Dong Bo Tian ◽  
Zhi Hao Wang ◽  
Yu Bai ◽  
Hui Qi Zheng ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Void Ratio ◽  
Friction Angle ◽  
Test Methods ◽  
Experimental Investigations ◽  
The Moon ◽  
Engineering Property ◽  
Lunar Dust ◽  
Large Numbers ◽  
Moon Exploration

Due to the preciousness of real lunar dust, the lunar dust simulant is usually employed to replace the real one in the large numbers of experimental investigations about its mechanical property and engineering property. Therefore, the investigation on mechanical property of lunar dust simulant is also extremely significant. This research has put forward several methods for measuring mechanical property, which are used to measure the parameters including particle size distribution, particle proportion, relative density, void ratio, cohesion, internal friction angle, etc. of lunar dust simulant. The lunar dust simulant is determined to be suitable for application in the moon exploration project experiment after comparing these parameters with relevant typical mechanical parameters of foreign lunar dust simulant.

scholarly journals Analogs of microgravity: the function of Schlemm’s canal, intraocular pressure and autonomic nervous during the head-down tilt test in healthy subjects

2021 ◽  
Vol 14 (9) ◽  
pp. 1419-1423
Author(s):  
Wei Chen ◽  
◽  
Yan Xiang ◽  
Chao-Hua Deng ◽  
Hong Zhang ◽  
...  
Keyword(s):  
Heart Rate ◽  
Intraocular Pressure ◽  
Linear Regression Analysis ◽  
Test Methods ◽  
Enhanced Depth Imaging ◽  
Tilt Test ◽  
Schlemm’S Canal ◽  
Autonomic Nervous ◽  
Schlemm's Canal ◽  
Department Of Ophthalmology

AIM: To evaluate the ocular outcomes and to elucidate possible mechanisms underlying intraocular pressure (IOP) change following the head-down tilt (HDT) test. METHODS: The study included 21 participants at the Department of Ophthalmology of Tongji Hospital. Subjects received the test of I-care tonometry, enhanced depth imaging optical coherence tomography and heart rate variability (HRV) analysis before and after 15min HDT test. The lumen area of Schlemm’s canal (SCAR), IOP, HRV were calculated. RESULTS: IOP increased significantly after 20° head down position from 14.0±3.0 to 17.0±3.3 mm Hg (P<0.001). SCAR decreased from 13449.0±5454.9 μm2 at sitting condition to 9576.6±4130.9 μm2 post 15min HDT test. High frequency (HF) indices increased significantly from 1462±865 Hz at baseline to 2128±824 Hz. Heart rate (HR) decreased significantly from 76±11.48 to 70±11.52 bpm after the HDT. The linear regression analysis showed that the difference of HF and SCAR significantly correlated with each other during the HDT (R2=20%, P=0.04). CONCLUSION: These outcomes perform the first evidence of the activation of autonomic nervous system of HDT may cause the collapse of Schlemm’s canal lumen, which in turn leading to the increased IOP.

ISRM Suggested Method for Determining the Basic Friction Angle of Planar Rock Surfaces by Means of Tilt Tests

2018 ◽  
Vol 51 (12) ◽  
pp. 3853-3859 ◽  
Author(s):  
L. R. Alejano ◽  
J. Muralha ◽  
R. Ulusay ◽  
C. C. Li ◽  
I. Pérez-Rey ◽  
...  
Keyword(s):  
Friction Angle ◽  
Suggested Method ◽  
Basic Friction Angle
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