Results 31 to 40 of about 1,591 (253)

Caving‐enhanced geothermal system overwhelms fracturing‐ and pipe‐enhanced geothermal system in heat extraction

Deep Underground Science and Engineering, EarlyView.
Our study reveals that caving‐enhanced geothermal systems (C‐EGS) with adequately fractured reservoirs achieve optimal heat extraction by minimizing preferential flow paths, while conventional fracturing (F‐EGS) and pipe‐based (P‐EGS) systems suffer accelerated thermal drawdown.
Fangchao Kang, Tianjiao Li, Yingchun Li, Jinlong Men, Chun'an Tang   +4 more
wiley   +1 more source

Blasting effects of the borehole considering decoupled eccentric charge

Alexandria Engineering Journal
The investigation of the blasting effects of the borehole considering decoupled eccentric charge is scarce and lacks thorough exploration. The coupled Smoothed Particle Hydrodynamics and Finite Element Method (SPH-FEM) is adopted to study the decoupled ...
Zhen Zhang, Jinshan Sun, Yongsheng Jia, Yingkang Yao, Nan Jiang   +4 more
doaj   +1 more source

Comparison of Presplit and Smooth Blasting Methods for Excavation of Rock Wells

Shock and Vibration, 2019
To understand differences of smooth and presplit blasting for the excavation of rock wells, two field experiments using these two techniques are implemented at the same test site, respectively.
Zilong Zhou, Ruishan Cheng, Xin Cai, Jinlong Jia, Weihua Wang   +4 more
doaj   +1 more source

Numerical and experimental study on P‐wave propagation across a rock joint with different orientations

Deep Underground Science and Engineering, EarlyView.
Joint orientation significantly affects P‐wave velocity, with the highest velocity at zero‐degree angles, decreasing to 30° as the angle increases. The velocity increases slightly from 30 to 45 degrees but sharply decreases from 45 to 90 degrees. Abstract Determination of the required parameters in different science contexts using the ultrasonic wave ...
Yaghoob Zarei, Mojtaba D. fallahi, Ali Uromeihy, Mohammad R. Nikoodel, Mohammad Fathollahy   +4 more
wiley   +1 more source

Instability mechanism and failure characteristics of underground cavern in block system under the action of seismic waves

Deep Underground Science and Engineering, EarlyView.
Seismic waves with tensile stress, high amplitude, and low frequency are most likely to trigger block instability and sliding. Blocks with a single sliding surface are more prone to movement than those with multiple constraints, and roof‐positioned blocks are especially vulnerable to slide.
Xiao Wang, Jinxiao Liu, Gaoshuo Zhang, Wenxin Li, Changdi He   +4 more
wiley   +1 more source

ORGANISATIONAL-TECHNOLOGICAL CHARACTERISTICS OF BLASTING WORKS ON THE GRIČ TUNNEL

Rudarsko-geološko-naftni Zbornik, 2005
The paper describes organisational-technological characteristics of blasting works during the excavation of the Grič Tunnel. The significance of blasting works during the excavation of the tunnel is shown through adjustment of blasting parameters taking ...
Zvonimir Deković, Zvonimir Ester, Mario Dobrilović   +2 more
doaj  

Analysis of damage accumulating characteristics and vibration isolating effect of presplitting blasting in excavation of large-scale navigation lock

Shuili Shuiyun Gongcheng Xuebao, 2023
Controlling the blast-induced damage is of significance for the stability of division pier in the excavation of the large-scale navigation lock. Based on the on-site experiment, the peak particle velocities (PPV) induced by production boreholes were ...
HU Haoran, ZHOU Haixiao, ZHANG Yuzhu, LI Dongdong, ZHANG Chen   +4 more
doaj   +1 more source

Advancing mine pillar design: Evaluating traditional methods and integrating AI for enhanced stability of pillars in the Great Dyke, Zimbabwe

Deep Underground Science and Engineering, EarlyView.
B1 is bord width 1, B2 is bord width 2, L is the pillar length, W is the pillar width, red color and letter A represent the pillars, and white color and number 1 represent excavated areas. Pstress is the average pillar stress; σv is the vertical component of the virgin stress, MPa; and e is the areal extraction ratio. e = B o B o + B P ${\rm{e}}=\frac{{
Tawanda Zvarivadza, Hendrik Grobler, Peter Apata Olubambi, Moshood Onifade, Manoj Khandelwal   +4 more
wiley   +1 more source

Research progress and current status of dynamic wave propagation characteristics in rock mass: A review

Deep Underground Science and Engineering, EarlyView.
This review elucidates the velocity–dispersion–attenuation coupling mechanisms of wave propagation in rock masses, compares six representative models, and reveals how pressure, temperature, mineral composition, and anisotropy jointly control dynamic responses in complex geological media.
Jiajun Shu, Tao Li, Ruiqi Yuan, Yue Li, Bingni Wu, Bo Liu, Zhengding Deng, Galindo Rubén, Fausto Molina‐Gómez   +8 more
wiley   +1 more source

Dynamic response and safety control of adjacent tunnels under blasting excavation of drainage tunnels

Yantu gongcheng xuebao
In the process of parallel blasting excavation of two tunnels, the construction of new tunnels will cause different degrees of vibration damage to the linings of the adjacent tunnels due to the small tunnel spacing. In this study, the blasting excavation
WANG Xubin 1 , YANG Zhenye 2, HUANG Ning 2, QIAN Jiangu 1
doaj   +1 more source