Results 61 to 70 of about 49,160 (240)
The Economic Impact of Failing Infrastructure in the New York Metropolitan Area [PDF]
, 2018 Infrastructure in the New York Metropolitan Area has been seriously underfunded due to a failure of public investment on the local, state and federal level.
Travis, Nicholas
core +1 more source
Study on Key Controlling Factors of Fracture Propagation by Shaped Charge Blasting in Coal Seams
Energy Science &Engineering, EarlyView.Gas drainage is the fundamental approach to controlling gas disasters in coal mines. For single low‐permeability coal seams, it should be supplemented by coal seam permeability enhancement technologies to improve gas drainage efficiency. This paper conducted a numerical simulation study on the key controlling factors affecting the fracturing effect of ...
Xin Yang +4 more
wiley +1 more source
Meikuang AnquanIn order to solve the problem of deep high stress argillaceous soft rock floor drainage roadway affected by mining disturbance, taking the layout optimization and surrounding rock control of deep argillaceous soft rock floor drainage roadway in Libi Coal
Liangshan LI +5 more
doaj +1 more source
Mining safely under a coal seam while protecting an overlying roadway
工程科学学报, 2022 To ensure the stability of an overlying roadway in close proximity to a 1000-m deep coal seam, this work, through theoretical analysis and numerical simulation, studies the deformation and failure mechanism, failure types, and prevention methods of the ...
Chao ZHOU +4 more
doaj +1 more source
Bolt-grouting combined support technology in deep soft rock roadway
International Journal of Mining Science and Technology, 2016 Abstract Analyzing the mineral composition, mechanical properties and ground stress testing in surrounding rock, the study investigated the failure mechanism of deep soft rock roadway with high stress. The bolt-grouting combined support system was proposed to prevent such failures.
Yanlong Chen +4 more
openaire +2 more sources
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 +7 more
openaire +2 more sources
Failure Mechanism of Asymmetric Large Deformations Under Repeated Mining in Roadways
Energy Science &Engineering, EarlyView.Principal stress‐evolution diagram at different advance positions of 42205 working face. ABSTRACT To address the challenge of controlling severe asymmetrical deformation in roadways subjected to repeated mining, this study (i.e., based on the engineering context of the Buertai Coal Mine) investigated the characteristics of the regional stress field in ...
Ai‐Rong Wang +3 more
wiley +1 more source
矿业科学学报, 2019 In order to smoothly implement gob-side entry retaining and mining without coal pillar in 3207 working face of Nanyang Coal Mine,Shanxi Province,this paper proposes to carry out advanced deep-hole blasting pre-splitting roof near gob side supporting wall.
Hu Tao +6 more
doaj +1 more source
Numerical Simulation of Coupling Support for High-Stress Fractured Soft Rock Roadway in Deep Mine
Advances in Civil Engineering, 2022 Aiming at the difficulties during the support of high-stress fractured soft rock roadway in deep mine, a comprehensive surrounding rock management method of bolt-net-cable-grout coupling support is proposed and the mechanism of interaction between ...
Wenhua Yuan +4 more
doaj +1 more source
Research on Precise Identification of Rock Strength Based on Bolt Drilling Parameters
Energy Science &Engineering, EarlyView.Drilling detection test platform. ABSTRACT During roadway excavation, the presence of weak interlayers and fractured rock masses significantly affects roof stability. To achieve timely and effective roadway support, it is crucial to identify and predict different rock types based on drilling signals from roof bolters.
Qiang Zhu +4 more
wiley +1 more source