scholarly journals Understanding the Effect of Cementitious Grouting Pressure on Micro-Fracture Permeability for Rock Reinforcement Underground: A Lab Study

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4225
Author(s):  
Kai Wang ◽  
Lianguo Wang ◽  
Bo Ren ◽  
Hao Fan
Keyword(s):  
High Pressure ◽  
Common Factor ◽  
Experimental System ◽  
Pressure Curve ◽  
Fracture Permeability ◽  
Rock Reinforcement ◽  
Grouting Pressure ◽  
Percolation Effect ◽  
Fracture Opening ◽  
Pressure Grouting

In grouting support projects, due to the small concealment of micro-fractures, the support effect often fails to meet design requirements. The percolation effect is a common factor that causes grouting failure, and the influence of grouting pressure on the percolation effect is very obvious. In this article, a design of a micro-fracture grouting experimental system is presented that can realize high-pressure grouting and then uses a variety of ultrafine cements to carry out high- and low-pressure grouting tests under different fracture opening conditions, thereby obtaining the grouting pressure and accumulated grouting weight during the grouting process. The results show that a combination of the grouting pressure curve and the cumulative grouting weight curve can determine whether the ultrafine cement will have a percolation effect. Increasing the grouting pressure can reduce the critical fracture opening value and also reduce the occurrence of the percolation effect. The research results provide a theoretical basis for the high-pressure grouting of micro-fracture rock masses and offer certain guiding significance for the design of high-pressure grouting support schemes.

The Experimental Investigation of Steam Condensation With Non-Condensable Gas Under Natural Convection

2018 ◽  
Author(s):  
Xizhen Ma ◽  
Wen Fu ◽  
Haijun Jia ◽  
Peiyue Li ◽  
Jun Li
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
High Pressure ◽  
Natural Convection ◽  
Heat And Mass Transfer ◽  
Vertical Wall ◽  
Experimental System ◽  
Steam Condensation ◽  
Transfer Coefficients ◽  
Calculation Results

The non-condensable gas is used to keep the pressure stable in the steam-gas pressurizer. The processes of heat and mass transfer during steam condensation in the presence of non-condensable gas play an important role and the thermal hydraulic characteristics in the pressurizer is particularly complicated due to the non-condensable gas. The effects of non-condensable gas on the process of heat and mass transfer during steam condensation were experimental investigated. A steam condensation experimental system under high pressure and natural convection was built and nitrogen was chosen in the experiments. The steam and nitrogen were considered in thermal equilibrium and shared the same temperature in the vessel under natural convection. In the experiments, the factors, for instance, pressure, mass fraction of nitrogen, subcooling of wall and the distribution of nitrogen in the steam, had been taken into account. The rate of heat transfer of steam condensation on the vertical wall with nitrogen was obtained and the heat transfer coefficients were also calculated. The characteristics curve of heat and mass transfer during steam condensation with non-condensable gas under high pressure were obtained and an empirical correlation was introduced to calculated to heat transfer coefficient of steam condensation with nitrogen which the calculation results showed great agreement with the experimental data.

Research on Number of High-Pressure Grouting of Hierarchical Multiple for Slope Based on Reliability Analysis

2014 ◽  
Vol 716-717 ◽  
pp. 363-369
Author(s):  
Zhen Hua Xie ◽  
Dong Yang ◽  
Sha Sha Liang ◽  
Zhi Yun Jia
Keyword(s):  
High Pressure ◽  
Rock Mass ◽  
System Analysis ◽  
Rock Surface ◽  
Rock Permeability ◽  
Iron Mine ◽  
Probability Calculation ◽  
Before And After ◽  
Pressure Grouting ◽  
First Time

The technology of hierarchical multiple high-pressure grouting is an effective approach to manage high and steep slope of broken rock mass. The number of grouting is one of the key parameters of this technology. By the analysis of mechanics and grouting theory, the anchoring effect mainly is affected by anchor slurry vein and the contact area with rock mass. Based on the system analysis of slurry vein development for first time and many times high-pressure grouting, the process flow for hierarchical multiple high-pressure grouting is put forward. Serve the rock permeability changes before and after grouting as an indicator measuring slurry and rock surface area, the method of determining grouting number based on the reliable probability is got. Combined with the engineering example of Shouyun Iron Mine, this paper puts forward the reliability criteria of working state of hierarchical multiple high-pressure grouting. Through the probability calculation, the best number of grouting is 4 times. The tests of permeability of rock mass and drawing force verify the accuracy of this determination method.

CAD/CAE on the Mould Plates of Vertical Type High-Pressure Grouting Machine

2012 ◽  
Vol 538-541 ◽  
pp. 2681-2684
Author(s):  
Zhi Cheng Huang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Pressure ◽  
3D Model ◽  
Stress And Strain ◽  
Analysis Software ◽  
Element Analysis ◽  
Pressure Grouting ◽  
Object Of Study

Took a type of ceramics for daily use vertical type high pressure grouting machine as the object of study, study the stress and strain of its upper and lower mould plates. Established their 3D model by CAD software Pro-E, and then import them into finite element analysis software to analysis the value and distribution of the stress and strain. The analysis results can provide some reference for design, and have some engineering and practical value.

Notes: Schmelzpunkt, Volumen und Beständigkeit von Blut unter hohem Druck / Melting Pressure, Volume and Stability of Blood at High Pressure

1987 ◽  
Vol 42 (11-12) ◽  
pp. 1370-1372
Author(s):  
A. Kluge ◽  
H. Lentz
Keyword(s):  
High Pressure ◽  
Human Blood ◽  
Specific Volume ◽  
Steel Surface ◽  
Pressure Curve ◽  
Melting Pressure

The melting pressure and the specific volume of human blood was measured up to pressures of 1000 bar or more. The melting pressure curve has a slope of -138 bar K-1. The compressibility of blood is nearly twice the value of blood scrum. After application of high pressure the blood exhibits some haemolysis most probably due to the effect of the steel surface of the autoclave.

Experimental Research of Impinging Spray with Basic Impinging Scheme

2013 ◽  
Vol 281 ◽  
pp. 351-354
Author(s):  
Lei Chen ◽  
Peng Song ◽  
Guo Kai Xu ◽  
Bao Guo Du ◽  
Wu Qiang Long
Keyword(s):  
High Pressure ◽  
Control System ◽  
Experimental System ◽  
Supply System ◽  
Distribution Area ◽  
Light Path ◽  
Path System ◽  
Visualization Experiments ◽  
And Control ◽  
Image Collection

Visualization experimental system of impinging spray including high-pressure vessel, oil supply system, light path system, image collection and treatment system and control system was designed, and the visualization experiments of basic impinging schemes of flat wall was carried out under existing conditions without laser. The effect of impinging distance on rebounding distance and diffusing area of dripping was analyzed. The results show that both of diffusing distance along the wall and distribution area linearly increased within a certain time under the same impinging distance. Both of diffusing distance along the wall and rebounding distance decreased with the increase in impinging distance.

Design and analysis of a high pressure and high temperature sulfuric acid experimental system

2012 ◽  
Vol 251 ◽  
pp. 157-163 ◽  
Author(s):  
Sung-Deok Hong ◽  
Chan-Soo Kim ◽  
Yong-Wan Kim ◽  
Dong-Un Seo ◽  
Goon-Cherl Park
Keyword(s):  
High Pressure ◽  
Sulfuric Acid ◽  
High Temperature ◽  
Experimental System

The Research of Intelligent High-Pressure Water Jet Target Detection Experimental System

2013 ◽  
Vol 791-793 ◽  
pp. 866-869
Author(s):  
Hao Yang ◽  
Meng Meng Niu ◽  
Dong Su Zhang ◽  
Jing Xi Li
Keyword(s):  
High Pressure ◽  
New Technology ◽  
Target Material ◽  
Experimental System ◽  
Target Object ◽  
Water Jet ◽  
Detection Technology ◽  
Material Detection ◽  
Pressure Water ◽  
High Pressure Water Jet

As a new technology, high-pressure water jet technology is widely used in various fields .However high-pressure water jet is used for the detection of the target material in China and abroad, is still in its infancy. So this article studies on high-pressure water jet target material detection technology .This paper aims to study the target object detection experimental device and the follow-up process of detect sound signal.

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