Results 111 to 120 of about 98,352 (281)

Investigation on hard‐rock breaking performance and auxiliary mechanism of picks assisted with both‐sided high‐pressure water jets

Deep Underground Science and Engineering, EarlyView.
This paper investigates the high‐pressure water jet‐pick combined rock‐breaking mode (HPC), which employs high‐pressure water jets to precut grooves on both sides of the picks. The rock‐breaking patterns and performance of the HPC method are obtained, and the auxiliary rock‐breaking mechanism of water jet grooving is revealed.
Jingjing Lu, Jiancheng Xiao, Hui Zhou, Xiao Ma, Congcong Hou, Jian Cui, Fujian Yang   +6 more
wiley   +1 more source

Analysis of Pressure and Tip Stress in Hydraulic Fracture under Unstable Fluid Injection Condition

Shiyou jixie, 2018
To understand the pressure and tip stress change in hydraulic fracture during unstable fluid injection, the calculation model of fluctuating pressure in wellbore under unstable fluid injection condition was established using fluid mechanics theory.
Tong Shaokai, Gao Deli
doaj  

Numerical simulation of interface dip angle on hydraulic fracture propagation path in composite coal rock

Journal of Applied Science and Engineering
For deep coalbed methane (CBM) exploitation, it is very important to control hydraulic fractures in coal seam to avoid the decrease of fracturing energy caused by crossing coal-rock interface.
Dongjie Jiang, Fan Zhang, Rui Guo, Junjie Guo, Ji He, Wei Han, Yongming Song, Zidong Zhao   +7 more
doaj   +1 more source

Hydraulic Fracture Propagation and Analysis in Heterogeneous Middle Eastern Tight Gas Reservoirs: Influence of Natural Fractures and Well Placement. [PDF]

ACS Omega, 2021
Al Mteiri S, Suboyin A, Rahman MM, Haroun M.   +3 more
europepmc   +1 more source

Slip versus dilation tendency parameter space as a tool for prospecting structurally controlled geothermal systems in greenfield: insights from the greater Ruhr region

Deep Underground Science and Engineering, EarlyView.
This study highlights that with the static and time‐dependent evolution of slip versus dilation tendency parameter space, structurally controlled deep geothermal systems can be selected within areas of higher permeability and lower seismic hazard. Abstract Faults play a vital role in the Earth's hydraulic system by facilitating fluid flow when dilating
Michal Kruszewski, Alessandro Verdecchia, Oliver Heidbach, Rebecca M. Harrington, David Healy   +4 more
wiley   +1 more source

Failure Mode of the Water-filled Fractures under Hydraulic Pressure in Karst Tunnels

Open Geosciences, 2017
Water-filled fractures continue to grow after the excavation of karst tunnels, and the hydraulic pressure in these fractures changes along with such growth.
Dong Xin, Lu Hao, Huang Houxu, Hao Yiqing, Xia Yuanpu   +4 more
doaj   +1 more source

Random finite element analysis on ground subsidence caused by tunnel excavation in karst regions with spatial variable soil

Deep Underground Science and Engineering, EarlyView.
This study investigates ground subsidence during tunnel excavation in karst areas, highlighting the combined effects of karst cave proximity, cave size, and soil spatial variability. Findings suggest that shorter cave distances and larger cave sizes increase subsidence variability, and a modified Peck formula is proposed for more accurate subsidence ...
Zhenghong Su, Yong Fu, Miaomiao Sun, Kailin Ding, Ying Zhao   +4 more
wiley   +1 more source

Permeability of granite from a shallow buried mountain pipe gallery tunnel under unloading confining pressure

Deep Underground Science and Engineering, EarlyView.
Triaxial compression tests under unloading confining pressure conditions were conducted to systematically analyze the permeability behavior of granite retrieved from the different classification surrounding rocks. Abstract The rock mass within mountain tunnels undergoes complex changes in permeability, strength, and deformation during tunneling ...
Xiaoyan Zhang, Yonghua Ye, Jianping Zuo, Baojiang Han, Weigang Jiao   +4 more
wiley   +1 more source

Numerical study of hydraulic fracturing on single-hole shale under fluid–solid coupling

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
To investigate the hydraulic fracture extension pattern of single-hole shale during hydraulic fracturing under fluid–solid coupling, this paper utilizes seepage–stress–damage coupling software to establish a mechanical model of hydraulic fracture ...
Xi Xia, Zhonghu Wu, Huailei Song, Wentao Wang, Hengtao Cui, Motian Tang   +5 more
doaj   +1 more source

The damage and failure mechanism of prestatically loaded rock during medium‐strain rate cyclic impact loading

Deep Underground Science and Engineering, EarlyView.
Based on experimental results and theoretical analysis, an established rock damage accumulation model that comprehensively considers the preapplied static load, impact peak value, impact frequency, and impact times. Abstract To study the rock damage mechanism under high static loading and superimposed medium strain rate cyclic impact loading, a series ...
Wei Wang, Hanpeng Wang, Zicheng Wang, Xinyuan Xie, Yunhao Wu, Jinhou Zhang, Dekang Sun   +6 more
wiley   +1 more source