Coupling Effect of Temperature, Gas, and Viscoelastic Surfactant Fracturing Fluid on the Microstructure and its Fractal Characteristics of Deep Coal

2021 ◽  
Author(s):  
Zepeng Wang ◽  
Zhaolong Ge ◽  
Ruihui Li ◽  
Zhe Zhou ◽  
Yudong Hou ◽  
...  
Keyword(s):  
Coupling Effect ◽  
Effect Of Temperature ◽  
Fracturing Fluid ◽  
Fractal Characteristics ◽  
Viscoelastic Surfactant

The Interaction of Temperature and Bending Load on Structural Performance of Chinese Larch Wood

2012 ◽  
Vol 531-532 ◽  
pp. 122-126
Author(s):  
Hai Bin Zhou ◽  
Chuan Shuang Hu ◽  
Jian Hui Zhou
Keyword(s):  
Elevated Temperatures ◽  
Coupling Effect ◽  
Structural Performance ◽  
Effect Of Temperature ◽  
Short Exposure ◽  
Short Exposure Time ◽  
Larch Wood ◽  
Timber Construction ◽  
Bending Load ◽  
Stress Levels

Wood is being used extensively in timber construction in China. In fire-resistant design for timber construction, the main goal is to ensure that enough structural integrity is maintained during a fire to prevent structure collapse. It is important to understand its structural performance when exposed to elevated temperatures and loaded by stress levels. To study the interaction effect of Chinese larch wood, a total of 72 small clear wood samples were observed under constant stress levels when the wood temperature was elevated. The results indicated that Chinese larch wood was more susceptible to the coupling effect of temperature and stress. The interaction promoted a temporary stable flexural structure to collapse during a short exposure time.

Study on the Main Characteristics of Reflective Cracking in the Asphalt Overlay on an Old Cement Pavement

2020 ◽  
Vol 980 ◽  
pp. 244-253
Author(s):  
Chun Fu Zhu ◽  
Pei Feng Cheng ◽  
Guang Yu Zhao
Keyword(s):  
Working Conditions ◽  
Coupling Effect ◽  
Shear Crack ◽  
Effect Of Temperature ◽  
Reflective Cracking ◽  
Effective Prevention ◽  
Finite Element Software ◽  
Asphalt Overlay ◽  
Prevention And Treatment ◽  
Reflection Crack

The purpose of this study is to explore the forms and characteristics of reflection crack in asphalt overlay of old cement pavement, so as to provide reference for effective prevention and treatment of reflection crack.By means of ANSYS finite element software, considering the coupling effect of temperature and vehicle in different working conditions, the influence of cooling on asphalt overlay was analyzed, and the location and form of crack were discussed.The analysis results show that tensile crack and shear crack are more likely to occur near the joint of old cement pavement, and shear crack is more likely to occur in areas outside the joint, about 1/2 wheel length from the joint of cement pavement.The prevention and treatment of crack at different locations should be carried out according to different working conditions.

Novel CO2-Emulsified Viscoelastic Surfactant Fracturing Fluid System Enables Commercial Production From Bypassed Pay in the Olmos Formation of South Texas

2006 ◽  
Author(s):  
Mark E. Semmelbeck ◽  
William Earl Deupree ◽  
John Kurt Von Plonski ◽  
Fred A. Mueller ◽  
Yiyan Chen ◽  
...  
Keyword(s):  
Commercial Production ◽  
South Texas ◽  
Fracturing Fluid ◽  
Fluid System ◽  
Viscoelastic Surfactant

scholarly journals The mechanical properties and fractal characteristics of the coal under temperature-gas-confining pressure

2019 ◽  
Vol 23 (Suppl. 3) ◽  
pp. 789-798
Author(s):  
Yanan Gao ◽  
Feng Gao ◽  
Guanghui Dong ◽  
Weicheng Yan ◽  
Xiaojun Yang
Keyword(s):  
Fractal Dimension ◽  
Confining Pressure ◽  
Gas Pressure ◽  
Effect Of Temperature ◽  
Deep Mining ◽  
Scale Method ◽  
Roof Caving ◽  
Fractal Characteristics ◽  
Covering Method ◽  
Meso Scale

Deep mining is the most important way to obtain the resource in China now. Thus, rock is the main objective that the deep mining will encounter. Meanwhile, the frequent catastrophes in deep mining such as rock burst, coal and gas bursts, roof caving, water bursts, is the most serious problem. To have a better understanding of the mechanisms of fracture and the laws of damage evolution of rock and coal under deep environment, in this paper, the micro- and meso-scale method is employed to study the behavior of coal under different temperature, confining pressure and gas pressure. Then, the significance of the effect of temperature, confining pressure, and gas pressure on mechanical parameters is analyzed by using the ANOVA method. The fractal study of coal failure pattern by employing the SEM test and fractal dimension was carried out. The fractal dimension of coal fractures was calculated by using the box-covering method. Then, the effects of all factors on the fractal dimension of coal fractures were analyzed.

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