Results 41 to 50 of about 49,160 (240)

New York City\u27s Pothole Law: In Need of Repair [PDF]

, 1982
In 1979, New York City enacted a local law requiring prior written notice of a defect before the city may be found liable for injuries resulting from potholes.
Frank, Terri J.
core   +1 more source

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

Automated identification of fissure trace in mining roadway via deep learning

Journal of Rock Mechanics and Geotechnical Engineering, 2023
The fractured rocks distributed near the structural surface of coal roadway heading face can easily cause water or air conduits, ultimately resulting in accidents that threaten production safety, such as mine flooding, gas leakage, or supporting failure. Therefore, successful detection of fissures is crucial to mine safety.
Yuxin Yuan, Nong Zhang, Changliang Han, Dongxu Liang   +3 more
openaire   +2 more sources

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

Numerical Investigation with Failure Characteristic Analysis and Support Effect Evaluation of Deep-Turning Roadways

Applied Sciences
In recent years, tunnel-boring machines (TBMs) have been widely applied in deep coal mining. Turning is an inevitable challenge in TBM tunneling, and a TBM turning roadway exhibits greater instability than a straight roadway, as engineering experience ...
Man Wang, Feng Ding, Zehua Niu, Yanan Gao, Huice Jiao, Zhaofan Chen   +5 more
doaj   +1 more source

Guidelines for the Use of Synthetic Fluid Dust Control Palliatives on Unpaved Roads [PDF]

, 2017
The amount of small soil particles, dust, lost from typical unpaved roads to fugitive dust is staggering. A 1 km stretch of unpaved road can contribute over 2400 kg of dust to the atmosphere (4.2 ton/mile) in a typical 3-month summer season.
Barnes, David, Connor, Billy
core  

Practical research on coal pillar retention in deep mining roadways

Scientific Reports
To address the limitations of traditional coal pillar design methods in engineering practice for deep retreat mining roadways, this research focuses on the retreat mining face at the Pinggang Coal Mine in Heilongjiang Province. Combining mechanical experiments, theoretical calculations, numerical simulations, and field tests, this study calculates the ...
Lei Wang, Gang Liu, Pingyun Ma, Binyang Duan, Fengxiang Wang, Yongtao Zhu   +5 more
openaire   +3 more sources

Composite grouting reinforcement technology for deep roadway surrounding rock

Gong-kuang zidonghua, 2022
The single grouting method and grouting material can not achieve an ideal grouting effect under the complex geological conditions of deep roadway surrounding rock. In order to solve this problem, a composite grouting reinforcement technology for deep roadway surrounding rock is proposed.
FU Yukai, WANG Tao, SUN Zhiyong, YUE Yanpeng   +3 more
openaire   +1 more source

Multiple injection techniques to stimulate complex fracture networks in coal reservoirs: A case study on gas disaster reduction of subsurface coal mine in southwest China

Deep Underground Science and Engineering, EarlyView.
An experimental device for physical simulation of hydraulic fracturing, comprising: a load‐bearing mechanism with multiple interconnected plates that collectively form an sample chamber; a load‐generating mechanisms, with multiple load‐generating mechanisms arranged within the experimental chamber.
Delei Shang, Farui Shi, Jun Lu, Minghui Li, Cunbao Li, Heping Xie   +5 more
wiley   +1 more source

Study on coal rib burst mechanism and its energy release characteristic in deep roadways

Meitan xuebao
Rock burst disaster has become a major safety problem in underground coal mining worldwide. Using the true triaxial electro-hydraulic servo loading test system, the stress-strain law, failure characteristics and acoustic emission activity law of coal ...
Ke DING, Qingheng GU, Lianguo WANG, Jiaxing GUO   +3 more
doaj   +1 more source