Study on Grouting Comprehensive Technical of Karst Tunnel with Water-Rich and High-Pressure

2014 ◽  
Vol 488-489 ◽  
pp. 786-789
Author(s):  
Yu Lin Zou
Keyword(s):  
Evaluation Method ◽  
Water Pressure ◽  
High Water ◽  
Western China ◽  
Effect Evaluation ◽  
Key Factors ◽  
Karst Tunnel ◽  
Pressure Water ◽  
Mixing Method ◽  
Specific Implementation

Based on a tunnel in western China as a project, with high water pressure, water-rich, karst features and other projects, launched grouting water research, the cement-silicate slurry mixing method for determining the mixing ratio to ensure the effectiveness and construction safety grouting key factors, as well as the specific implementation grouting effect evaluation method has important theoretical and practical value for the design and construction of similar tunnels provide a reference.

Study on Automatic Monitoring Technology of Tunnel Crossing Coal Bed and Gas

2014 ◽  
Vol 488-489 ◽  
pp. 778-781
Author(s):  
Cong He
Keyword(s):  
Evaluation Method ◽  
Water Pressure ◽  
Automatic Monitoring ◽  
High Water ◽  
Western China ◽  
Coal Bed ◽  
Key Factors ◽  
Pressure Water ◽  
Mixing Method ◽  
Specific Implementation

Based on a tunnel in western China as a project, with high water pressure, water-rich, karst features and other projects, launched grouting water research, the cement-silicate slurry mixing method for determining the mixing ratio to ensure the effectiveness and construction safety grouting key factors, as well as the specific implementation grouting effect evaluation method has important theoretical and practical value for the design and construction of similar tunnels provide a reference.

scholarly journals Automated technique for high-pressure water-based window cleaning and accompanying parametric study

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0242413
Author(s):  
Youngjoo Lee ◽  
Daesung Kwon ◽  
Changmin Park ◽  
Myoungjae Seo ◽  
TaeWon Seo
Keyword(s):  
High Pressure ◽  
Evaluation Method ◽  
Water Pressure ◽  
Reaction Force ◽  
Field Tests ◽  
Image Data ◽  
Spray Angle ◽  
Cleaning Performance ◽  
Pressure Water ◽  
Automated Technique

The maintenance of buildings has become an important issue with the construction of many high-rise buildings in recent years. However, the cleaning of the outer walls of buildings is performed in highly hazardous environments over long periods, and many accidents occur each year. Various robots are being studied and developed to reduce these incidents and to relieve workers from hazardous tasks. Herein, we propose a method of spraying high-pressure water using a pump and nozzle, which differs from conventional methods. The cleaning performance parameters, such as water pressure, spray angle, and spray distance, were optimized using the Taguchi method. Cleaning experiments were performed on window specimens that were contaminated artificially. The cleaning performance of the proposed method was evaluated using the image-evaluation method. The optimum condition was determined based on the results of a sensitive analysis performed on the image data. In addition, the reaction force due to high pressure and impact force on the specimens were investigated. These forces were not sufficient to affect the propeller thrust or cause damage to the building’s surface. We expect to perform field tests in the near future based on the output of this research.

scholarly journals Analysis on Water Inrush Process of Tunnel with Large Buried Depth and High Water Pressure

Processes ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 134 ◽  
Author(s):  
Weimin Yang ◽  
Zhongdong Fang ◽  
Hao Wang ◽  
Liping Li ◽  
Shaoshuai Shi ◽  
...  
Keyword(s):  
High Pressure ◽  
Model Test ◽  
Water Pressure ◽  
Water Inrush ◽  
High Water ◽  
Surrounding Rock ◽  
Karst Cave ◽  
Tunnel Excavation ◽  
Pressure Water ◽  
High Water Pressure

In order to explore the catastrophic evolution process for karst cave water inrush in large buried depth and high water pressure tunnels, a model test system was developed, and a similar fluid–solid coupled material was found. A model of the catastrophic evolution of water inrush was developed based on the Xiema Tunnel, and the experimental section was simulated using the finite element method. By analyzing the interaction between groundwater and the surrounding rocks during tunnel excavation, the law of occurrence of water inrush disaster was summarized. The water inrush process of a karst cave containing high-pressure water was divided into three stages: the production of a water flowing fracture, the expansion of the water flowing fracture, and the connection of the water flowing fracture. The main cause of water inrush in karst caves is the penetration and weakening of high-pressure water on the surrounding rock. This effect is becoming more and more obvious as tunnel excavation progresses. The numerical simulation results showed that the outburst prevention thickness of the surrounding rock is 4.5 m, and that of the model test result is 5 m. Thus, the results of the two methods are relatively close to each other. This work is important for studying the impact of groundwater on underground engineering, and it is of great significance to avoid water inrush in tunnels.

scholarly journals Analysis and Calculation of Lining Water Pressure of High Water Pressure Karst Tunnel

2020 ◽  
Vol 510 ◽  
pp. 052057
Author(s):  
Zhien Zhang ◽  
Mingli Huang ◽  
Chenglin Wang ◽  
Bo Jiang ◽  
Qiang Guan
Keyword(s):  
Water Pressure ◽  
High Water ◽  
Karst Tunnel ◽  
High Water Pressure

Study on Virtual Maintenance Training Effect Evaluation Based on Cognitive

2013 ◽  
Vol 401-403 ◽  
pp. 1972-1975
Author(s):  
Bo Yin ◽  
Hui Liu ◽  
Yong Jun Ruan
Keyword(s):  
Teaching Methods ◽  
Evaluation Method ◽  
Training System ◽  
Training Effect ◽  
Traditional Teaching ◽  
Effect Evaluation ◽  
Traditional Teaching Methods ◽  
Specific Implementation ◽  
Virtual Maintenance ◽  
Balance Mechanism

Research results and assessments actuality of virtual maintenance training are introduced and the shortcomings of the current maintenance training assessment are analyzed. On the basis, virtual maintenance training effect evaluation method based on cognitive is putted forward, focusing on the specific implementation methods and procedures. With a certain type of equipment virtual maintenance training system for the learning of the knowledge of the fundamentals of the structure of "high and low balance mechanism" and "direction mechanism", virtual maintenance training effect is evaluated by comparing two training means learning effect of traditional teaching methods and virtual maintenance training.

scholarly journals Experimental Study on Methane Desorption with the Coupling Effects of High Pressure Water and Thermal

2017 ◽  
Author(s):  
Dong Zhao ◽  
Dayuan Li ◽  
Yulin Ma ◽  
Zengchao Feng ◽  
Yangsheng Zhao
Keyword(s):  
High Pressure ◽  
Gas Flow ◽  
Water Pressure ◽  
Water Injection ◽  
Key Factors ◽  
Gas Desorption ◽  
Pressure Water ◽  
Methane Desorption ◽  
Injection Technology ◽  
Desorption Capacity

Moisture and thermal are the key factors for influencing methane desorption during CBM exploitation. Using high pressure water injection technology into coalbed, new fractures and pathways are formed to methane transport. It is existed a phenomenon of water inhibiting gas flow. This study is focused on various water pressures impacted on gas adsorbed coal samples, then the desorption capacity could be revealed under different conditions. And the results are shown that methane desorption capacity was decreased with water pressure increased at room temperature and the downtrend would be steady until water pressure was large enough. Heating could promote gas desorption capacity effectively, with the increasing of water injection pressures, the promotion of thermal on desorption became more obvious. There are the others effects on methane desorption capacity influenced by water injection and thermal.

Experimental Research on Creep Laws of High-Water Material under Real Pressure Water Environment

2016 ◽  
Vol 705 ◽  
pp. 350-354
Author(s):  
Hui Xie ◽  
Ying Chen
Keyword(s):  
Experimental Research ◽  
Carrying Capacity ◽  
Water Pressure ◽  
Water Environment ◽  
High Water ◽  
Term Strength ◽  
Steady Creep ◽  
Creep Tests ◽  
Pressure Water

High-water material is a kind of new inorganic nonmetal material which mainly used in coal mine goaf filling. In order to simulate the real stress conditions of this material in goaf filling, the creep tests of high-water material in real pressure water environment were conducted and the creep laws were also researched. The results showed that water environment was conductive to maintaining and developing the strength of high-water material, and pressure water environment can improve the carrying capacity and long-term strength of high-water material. The deformation of steady creep period decreased while water pressure increased. And strain increasing caused by axial compression was less than strain increasing caused by water pressure. The time needed from starting to steady creep period was longer when water pressure was bigger.

Development and Experimental Research on a Formula of Water Inrush Coefficient

2013 ◽  
Vol 448-453 ◽  
pp. 3901-3907
Author(s):  
Gan Tian
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
Water Resistance ◽  
Water Pressure ◽  
Water Inrush ◽  
High Water ◽  
Residual Pressure ◽  
Simulation Experiments ◽  
Pressure Water ◽  
High Water Pressure

Based on analysis of water inrush coefficients developed and applied in deep coal mining with high water pressure, the author proposes that there are some defects of water inrush coefficients in calculation and application. By simulation experiments on the water resistance properties of the aquiclude in a coal seam floor, the author arrived at the distribution and digital characteristics of residual pressure in the course of high-pressure water rising in the water-resisting floor. The formula for a water inrush coefficient has been further revised.

Discussion on Structure Design of Shaft Lining Built in Porous Rocky Aquifer with High Water Pressure

2012 ◽  
Vol 446-449 ◽  
pp. 2196-2201
Author(s):  
Xiao Min Zhou ◽  
Bing Deng ◽  
Cheng Xuan Ma
Keyword(s):  
Water Pressure ◽  
High Water ◽  
Structure Design ◽  
Surrounding Rock ◽  
Porous Rock ◽  
Traditional Design ◽  
Universal Feature ◽  
Pressure Water ◽  
Shaft Lining ◽  
High Water Pressure

Firstly based on the practical problem of lining thickness built in porous rock aquifer with high water pressure, this paper introduce the mechanical and stable seepage model, and design formula of shaft lining named Baoshen; Secondly, the character of load and parameters in the “Baoshen” formula are studied, compared with the “Lame” formula and the original heavy earth field , which shows good universal feature to cover several traditional design methods. Thirdly, the principals of interaction among high pressure water, lining and surrounding rock are revealed by figure and discuss on inequality inequation; With a newly application example, the practical usage are introduced and newly viewpoints are opened to designers with material promotion, arrangement of re-bar or bolt, structure optimum etc.

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