scholarly journals The Research on the Effect of Humidity on the Rheological Model of Swelling Rock

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Ming Ji ◽  
Yi-Dong Zhang
Keyword(s):  
High Stress ◽  
The State ◽  
Rock Stress ◽  
Rheological Analysis ◽  
Slope Engineering ◽  
Instantaneous Elasticity ◽  
After Effect ◽  
Swelling Rock ◽  
Viscoelastic Plasticity ◽  
Humidity Field

The research on the rheological mechanical behaviour of swelling rock in the condition of humidity field has a significant meaning for large rock engineering, such as deep coal mining, tunnelling, and slope engineering. Based on the Nishihara model, considering on the effect of humidity factor on swelling rock, the rheological elements are established and the effects of humidity on the damage of rock, the viscosity, and the elasticity are introduced. Moreover, the viscoelastic plasticity constitutive equations are established under the coupling of swelling rock stress and humidity. Afterward, considering the effects of humidity on the damage, elasticity, and viscosity, the creeping, unloading, and relaxation equations have been deduced. From this research, under the state of low stress σ3P<σS, the Nishihara model which considers the effect of humidity shows the properties of stable creeping. In addition, the unloading curves contain instantaneous elasticity, elastic after effect, and the viscosity flow induced by the humidity. However, under the state of high stress σ3P≥σS, it is an unstable creeping model. The unloading curves include instantaneous elasticity, elastic after effect, and the viscosity flow induced by the stress and the humidity. This model reflects the rheological properties of swelling rock comprehensively, and it can be used for rock rheological analysis.

scholarly journals Interdisciplinary Technologies in Socio-Political Rehabilitation

2019 ◽  
Vol 1 (1) ◽  
pp. 60-62
Author(s):  
Oleksandr Malkhazov ◽  
Sergiy Osypenko
Keyword(s):  
Traumatic Event ◽  
Diagnostic System ◽  
The State ◽  
Psychological Support ◽  
Emotional States ◽  
Diagnostic Device ◽  
Special Equipment ◽  
After Effect ◽  
Rehabilitation Measures ◽  
Step Control

The purpose of the research is to develop a technology of socio-political rehabilitation of the individuals who experienced a traumatic event or suffer from PTSP. The technology is supposed to use a modern diagnostic device system to measure psychological and psychophysiological characteristics of an individual. The research allowed verification of the assumption that control of the dynamics of the changes occurring in the state of the patient under the influence of the rehabilitation measures increases effectiveness of the psychological support. The control is mainly performed immediately after the completion of the whole set of rehabilitation measures and/or in a certain period after their completion (in order to determine the action after effect). To develop the ability to regulate emotional states of the individuals who experienced a posttraumatic event it is suggested to apply the technology of socio-psychological rehabilitation, which can be implemented with the help of special equipment. Therefore, one of the tasks of the study was to develop a diagnostic system to perform step-by-step control of effectiveness of the rehabilitation procedures.

Field Monitoring of Surrounding Rock Stress and Rheological Analysis in Tunnel Construction

2011 ◽  
Vol 261-263 ◽  
pp. 1079-1083 ◽  
Author(s):  
Qiang Huang ◽  
Ying Na Dong ◽  
Zhi Da Li
Keyword(s):  
Numerical Simulation ◽  
Spatial Effect ◽  
Surrounding Rock ◽  
Monitoring Data ◽  
Rock Stress ◽  
Stress Variation ◽  
Rheological Analysis ◽  
Tunnel Diameter ◽  
Simulation Results ◽  
Surrounding Rock Stress

The stress field monitor and rheological analysis have been done during excavation. The field monitoring data are compared with numerical simulation results. The result shows: Rock stress variation is influenced by both spatial effect and time effect; when the distance from monitoring section to tunnel face is less than a tunnel diameter, the surrounding rock stress is mainly affected by spatial effect and changes violently; when the distance is more than a tunnel diameter, the surround rock presents rheological properties and stress changes smoothly and continuously. Analyzing the monitoring data and fitting by Poynting-Thomson three-parameter rheological model, we can get the radial stress variation equation with time and predict the final variation value. The final value and numerical simulation results are in comparative agreement.

scholarly journals Elastic-plastic analysis and shrinkage properties study of swelling rock borehole in coalmine

2020 ◽  
Vol 8 (4) ◽  
Author(s):  
Jifeng Hou ◽  
◽  
Zhongping Guo ◽  
◽  
Keyword(s):  
Stress Field ◽  
Plastic Zone ◽  
Water Content ◽  
Radial Displacement ◽  
Water Pressure ◽  
Borehole Wall ◽  
Elastic Plastic ◽  
Ground Stress ◽  
Swelling Rock ◽  
Humidity Field

The borehole shrinkage of swelling rock in coalmine is a complex problem affected by the combination of multiple fields, such as humidity field and stress field. By establishing the equilibrium equation of swelling rock borehole in coalmine, considering the expansion and softening properties, an elastic-plastic mechanics analysis was carried out, and the plastic zone radius and radial displacement of swelling rock borehole in coalmine were determined under the combination of humidity field and stress field. Taking the floor rock roadway in the 8# coal seam of Songzao Coalmine in Chongqing as an example, the influence laws of water content, ground stress, and water pressure in the hole on the borehole shrinkage were studied. The results show that, with the increase of water content of the surrounding rock, the radius of plastic zone and radial displacement of borehole wall gradually increase. Both the humidity expansion and softening have an important influence on borehole shrinkage in coalmine, and the radial displacement of borehole wall under the combination of swelling and softening is greater than that of only considering expansion or softening. With the increase of ground stress, the radius of plastic zone and radial displacement of borehole wall gradually increase, showing a nonlinear increasing relation. The larger the water pressure in the borehole, the smaller the radius of plastic zone and radial displacement of borehole wall, and properly increasing the water pressure in the borehole can effectively control the borehole shrinkage. The accuracy of theoretical analysis was further r verified by similar model tests. The results can provide a theoretical basis for solving the problem of borehole shrinkage in the swelling rock of coalmine.

Subjective Anxiety Measurements and Cortisol Responses in Adults Who Stutter

1994 ◽  
Vol 37 (4) ◽  
pp. 760-768 ◽  
Author(s):  
Gordon W. Blood ◽  
Ingrid M. Blood ◽  
Stephanie Bennett ◽  
Kathleen C. Simpson ◽  
Elizabeth J. Susman
Keyword(s):  
Trait Anxiety ◽  
Salivary Cortisol ◽  
State Anxiety ◽  
Communication Apprehension ◽  
High Stress ◽  
The State ◽  
Self Report ◽  
Cortisol Responses ◽  
Anxiety Levels ◽  
Cortisol Levels

Anxiety, as measured by self-report inventories and salivary cortisol levels, was examined in 11 males who stutter and 11 males who do not stutter during baseline, low stress, and high stress sessions. During the high stress session salivary cortisol was significantly greater in persons who stutter than in persons who do not stutter. No significant differences were found between the two groups on the State-Anxiety Inventory, Trait-Anxiety Inventory, or the Personal Report of Communication Apprehension. Significant differences in anxiety levels among the baseline, low stress, and high stress sessions for both groups of subjects were found for the State-Anxiety Inventory. No other significant differences or relationships were found between the two groups.

Rock stress measurements and the state of stress at an open-pit limestone mine in Japan

2002 ◽  
Vol 67 (1-2) ◽  
pp. 201-217 ◽  
Author(s):  
Seong-Seung Kang ◽  
Bo-An Jang ◽  
Choo-Won Kang ◽  
Yuzo Obara ◽  
Jun-Mo Kim
Keyword(s):  
The State ◽  
Open Pit ◽  
Rock Stress ◽  
Stress Measurements ◽  
State Of Stress

scholarly journals City of Knowledge in Twentieth Century Iran

2014 ◽  
Vol 31 (1) ◽  
pp. 107-110
Author(s):  
Mojtaba Ebrahimian
Keyword(s):  
Twentieth Century ◽  
The State ◽  
Iranian Studies ◽  
History Of ◽  
After Effect ◽  
National Perspective ◽  
The Relationship

Setrag Manoukian’s City of Knowledge in Twentieth Century Iran: Shiraz,History, and Poetry combines the application of Michel Foucault’s conceptualizationof the relationship between “knowledge” and “power” with a “historicaland ethnographic investigation” into the sociocultural and political lifeof twentieth-century Shiraz in order to portray a history of Iran and Iraniansthat differs from the usual accounts focusing on Tehran.The book is intended for both Iranian studies scholars and the generalpublic interested in the history of Iran. Avoiding an exclusivist approach thatBook Reviews 107offers either “a national perspective from the capital Tehran” or “a purely localview from a self-contained city,” the book provides, in the author’s words,“the viewpoint of Shiraz as a ‘province’ to highlight how local, national andglobal dimensions are mutually constituted.” It discusses the “question ofknowledge” from the viewpoint of Shiraz because most of the research oncontemporary Iran concentrates on the capital as representative of the wholecountry. In his view, “the after-effect of this concentration on Tehran is an analyticalposture that posits either the state and/or the nation as the startingpoints of the analysis, obliterating the multiplicity of convergences and divergencesfrom which both these constituencies emerge” (p. 3) ...

Rock Bolts Health Monitoring Using Self-Excited Phenomenon

2016 ◽  
Vol 248 ◽  
pp. 186-191 ◽  
Author(s):  
Janusz Kwaśniewski ◽  
Ireneusz Dominik ◽  
Krzysztof Lalik ◽  
Waldemar Korzeniowski ◽  
Krzysztof Zagórski ◽  
...  
Keyword(s):  
Health Monitoring ◽  
The State ◽  
The Self ◽  
Stress Change ◽  
Rock Stress ◽  
Rock Bolts ◽  
Change Measurement ◽  
Mining Safety

Health monitoring of rock bolts can indirectly indicate the state of rock which is crucial for mining safety. This paper presents an innovative application of the Self-excited Acoustical System SAS for stress change measurement in rock bolts which are used to secure roofs and walls in mines and tunnels. The method gives information on the change of rock stress in the immediate area next to the bolt. It can be used also to determine the necessity of the exploited bolt replacement.

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