Results 31 to 40 of about 3,080 (218)

Control theory of uniform strength support in deep roadway

矿业科学学报, 2021
In this paper, a large number of coal mine roadway failure cases are investigated, and 6 types and 15 typical failure forms are extracted.The mechanical characteristics and stress distribution of surrounding rock of typical roadway shapes such as circular and rectangular are analyzed.At present, the technology of high-strength prestressed bolt support,
Zuo Jianping, Wen Jinhao, Liu Dejun, Wu Lili, Sun Yunjiang   +4 more
openaire   +1 more source

Stability Analysis of Roadway Groups under Multi-Mining Disturbances

Applied Sciences, 2021
The roadway stability has been regarded as the main challenging issue for safety and productivity of deep underground coal mines, particularly where roadways are affected by coal mining activities.
Yuantian Sun, Ruiyang Bi, Qingliang Chang, Reza Taherdangkoo, Junfei Zhang, Junbo Sun, Jiandong Huang, Guichen Li   +7 more
doaj   +1 more source

Mechanism of rock burst in deep double pillar roadway

Meikuang Anquan, 2021
According to the characteristics of deep double coal pillar working face in Hongqinghe Coal Mine, such as strong rock burst, large damage range and complex influencing factors, the methods of surface observation, coal stress monitoring and micro-seismic monitoring were used to analyze the buried depth, double width coal pillar reservation and mining ...
ZHANG Zhenjin, DU Taotao
openaire   +1 more source

Experimental Study of Seepage Characteristics of Filling Structures in Deep Roadway

Geofluids, 2022
In order to study the seepage failure mechanism of roadway filling medium consisting of cohesive soil under complex hydrogeological conditions, a large-scale triaxial stress-seepage test system was utilized to investigate the influence of kaolin content and seepage loading rate on the seepage characteristics of filling medium.
Shaoshuai Shi, Xiangxiang Zhu, Zhiguo Cao, Lin Bu, Zhijie Wen, Zongqing Zhou, Weidong Guo, Ruijie Zhao   +7 more
openaire   +2 more sources

Damage evolution characteristics of coal body in borehole at deep roadway wall and strength weakening mechanism of surrounding rock in borehole

Meitan xuebao
Coal seam drilling pressure relief technology is an important means to prevent and control rock burst disasters. Using the self-developed real-time CT scanning true triaxial loading test system, the force-strain law and internal crack propagation ...
Ke DING, Hualei ZHANG, Lianguo WANG, Jiaxing GUO, Yaoyao MENG   +4 more
doaj   +1 more source

Detection of Particulate Matter With Lock‐In Thermography

CleanMat, EarlyView.
Accurate quantification of black carbon is essential due to its significant impact on climate, air quality, and human health. Lock‐in thermography (LIT), as implemented by NanoLockin's instrument Calorsito, offers a sensitive, scalable, and reproducible approach for detecting black carbon on filter substrates.
Alina Oetsen, Christoph Geers, Andreas Traube, Gunter Festel, Daniel Fehr, Mathias Bonmarin   +5 more
wiley   +1 more source

Study on fracture parameter calibration and failure characteristics of rock with hole and crack

Deep Underground Science and Engineering, EarlyView.
The SIF and plastic zone equations for a single hole and crack have been derived. The model's failure state leads to the identification of four types of cracks. The plastic zone increases with increased brittleness and decreased crack length. Abstract Cracks within the surrounding rock of roadways significantly affect their stability and failure ...
Shaochi Peng, Wensong Wang
wiley   +1 more source

Shear behavior of bolt–grout interfaces under constant normal stiffness: Influence of grout strength and thickness

Deep Underground Science and Engineering, EarlyView.
The effects of grout strength and thickness on the shear behavior of bolt–grout interfaces (BGI) under constant normal stiffness conditions are investigated. Shear strength, failure modes, and acoustic emission characteristics are examined. The findings reveal that grout strength exerts a significantly greater influence on BGI shear strength and ...
Sunhao Zhang, Dongqi Shang, Yujing Jiang, Jinge Zhang, Hongbin Chen, Tianqi Jiang   +5 more
wiley   +1 more source

Real‐time lithology identification while drilling based on drill cuttings image analysis with ensemble learning

Deep Underground Science and Engineering, EarlyView.
A lithology identification while drilling method was developed, integrating an automated cuttings sampling system, a smart drilling rig, and an ensemble learning model. Underground trials achieved 97.42% accuracy in real‐time identification of cuttings lithology and composition, enhancing hazard management and supporting unmanned drilling technology in
Kun Li, Ting Ren, Ningping Yao, Jon Roberts, Haitao Song, Zhongbei Li, Xueqiu He, Liang Zhao   +7 more
wiley   +1 more source

Discontinuous Deformation Characteristics of Deep Buried Roadway Roofs and Linkage Control of Thick Layer Cross-Boundary Anchorage: A Case Study

Energies, 2023
After deep mining, the discontinuous deformation characteristics of roadway roofs become more and more obvious, resulting in the emergence of separation fractures in the rock mass, which seriously affects the stability of the roof rock mass.
Changliang Han, Nong Zhang, Houqiang Yang, Qifeng Zhao, Kai Song   +4 more
doaj   +1 more source