Results 41 to 50 of about 23,904 (309)

Experimental Study on the Influence of Jet Dynamic Pressure Based on a New Confining Pressure Control System

Shiyou jixie
To address challenges such as low operating efficiency and poor descaling effect in jet stimulation operation of deep/ultra-deep wells， the influence of downhole environmental pressure （confining pressure） on jet dynamic pressure has been studied at home
Zhou Shijie, Lü Weiping, Liu Jiawei, Zhang Zheng, Zhu Ye, Luo Bin   +5 more
doaj   +1 more source

Numerical study on compressive mechanical characteristics of filled jointed rock under confining pressure based on PFC

Frontiers in Ecology and Evolution, 2023
Confining pressure is an important factor affecting the strength and deformation characteristics of rock mass, it is of great significance to study the mechanical and deformation characteristics of jointed rock mass under confining pressure for the ...
Lang Song, Lang Song, Shaobo Chai, Jing Li, Boyang Song, Lianzeng Chai   +5 more
doaj   +1 more source

Influence of confining pressure-dependent Young’s modulus on the convergence of underground excavation

, 2018
The actual convergence of an excavation located in fractured rock mass or the soft rock is largely different with the theoretical result in many cases.
Wu, Xuezhen, Guan, Zhenchang, Jiang, Yujing, Gong, Bin   +3 more
core   +1 more source

Study on the damage characteristics of gas-bearing shale under different unloading stress paths.

PLoS ONE, 2019
In order to understand the influence of unloading on the mechanical properties of shale rock, triaxial unloading tests under different stress paths were conducted.
Yintong Guo, Lei Wang, Xin Chang
doaj   +1 more source

Explosive fracturing simulation experiment for low permeability reservoirs and fractal characteristics of cracks produced

Petroleum Exploration and Development, 2013
Based on the explosive fracturing simulation experiment for low permeability reservoir, growths of the cracks produced by the explosive fracturing in the samples were analyzed.
Peng XU, Yuanfang CHENG, Xinyun LIU, Xiaochun ZHANG, Libao SHI   +4 more
doaj   +1 more source

The influence of the bedding angle under passive confining pressure on the dynamic strength and energy consumption of shale

矿业科学学报, 2021
In order to analyze the strength characteristics, damage characteristics and energy dissipation laws of the bedding shale specimens under passive confining pressure, the Hopkinson Pressure Bar(SHPB)device was used to perform different impact pressures ...
Yang Guoliang, Bi Jingjiu, Zhang Zhifei, Li Xuguang, Liu Jie, Hong Peixuan   +5 more
doaj   +1 more source

A modified strain-softening model with multi-post-peak behaviours and its application in circular tunnel

, 2018
A large number of laboratory experiments have shown that the rocks in post-peak state present strain-softening behaviour under low confining pressure, and gradually evolved into elastic-perfectly plastic with the increasing of confining pressure. Neither
Xuezhen Wu, Zhenchang Guan, Wu, Xuezhen, Guan, Zhenchang, Jiang, Yujing, Yujing Jiang   +5 more
core   +1 more source

Experimental Study on the Deformation and Permeability Characteristics of Raw Coal under the Coupling Effect of Confining Pressure and Pore Pressure

Advances in Materials Science and Engineering, 2021
The effects of confining pressure and pore pressure on the deformation and permeability characteristics of raw coal are studied experimentally. The deformation properties of raw coal by fracture and its permeability evolution laws under the coupling ...
Kangwu Feng, Kequan Wang, Yushun Yang
doaj   +1 more source

Mechanical Properties of Rock–Coal–Rock Composites at Different Inclined Coal Seam Thicknesses

Frontiers in Physics, 2022
A comprehensive understanding of the mechanical properties of coal and rock sections is necessary for interpreting the deformation and failure modes of such underground sections and for evaluating the potential dynamic hazards. However, most studies have
Bo Ma, Feng Wang, Feng Wang, Hongyang Liu, Dawei Yin, Dawei Yin, Zhiguo Xia   +6 more
doaj   +1 more source

Hospitalization Through Families’ Eyes: Comparing Inpatient Care Quality for Children With Sickle Cell Disease and Cystic Fibrosis in Canada

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Sickle cell disease (SCD) is a chronic, inherited hemoglobinopathy that requires frequent hospitalization for disease‐related complications. Canadian data on inpatient care is limited. This study compared caregiver‐reported hospital experiences of children with SCD to those with cystic fibrosis (CF), a chronic, autosomal recessive ...
Hailey M. Zwicker, Kyle Kemp, Perri Tutelman, Sharon H. J. Hou, Paul Fairie, Maria Santana, Gregory M. T. Guilcher, Taryn Fay‐McClymont, Glenda Bendiak, Wendy Pelletier, Nicola Wright, Fiona Schulte   +11 more
wiley   +1 more source