##tihuan2##Volume parameters such as the volume of voids (VV), voids filled with asphalt (VFA), and voids in mineral aggregates (VMA) all have significant impact on asphalt mixtures. In this study, the vertical vibration compaction method (VVCM) was employed to produce a large-particle-size asphalt mixture (LSAM-50). The correlations between the …
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##tihuan2##A position 80 m away from the fault is the dividing line between the fault-non-affected area and the fault-affected area. The 13,200 working face of the Gengcun coal …
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##tihuan2##Because the mining depth of modern coal mines is large and the depth of vertical shaft may extend more than 1000 m, the falling speed of the solid backfill …
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##tihuan2##The same year Mexico imported 2696 kt of sub-bituminous coal. Coal Consumption. Mexico consumed nearly 21 million short tons of coal in 2019. Imports. Despite having its own domestic production, Mexico must still import coal to supply its three large coal-fired power plants: Carbon II, José López Portillo, and Petacalco.
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##tihuan2##For the purpose of preventing vibration-sensitive optical switches from malfunction caused by broadband vertical vibration, a novel two-stage vibration isolation platform is proposed. The primary s... Skip to main content. Intended for healthcare professionals ... The primary stage is a bellows-type isolator of large stroke and low …
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##tihuan2##The proposed vibration signal monitoring system ensures that three types of underground vibration events (high roof breaking, low roof breaking, and coal fracturing …
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##tihuan2##Vertical Vibrations of Suspension Bridges: A Review and a New Method Han Fei1 · Zichen Deng1 · Danhui Dan2 Received: 20 June 2019 / Accepted: 11 April 2020 / Published online: 23 April 2020 ... bridge when the span is very large. Due to the small stiness of the suspension bridge, its dynamic problem is more prominent than other bridges.
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##tihuan2##An innovative mechanical–hydraulic coupling system model of the caving mechanism impact by coal rock is established. The metal plate impact test proved the …
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##tihuan2##In the equation, u—the Poisson's ratio of the rock formation; q—The self-weight and applied loads on the rock strata, N/m 2; a 1, a 2 —The advancing distance of the working face, m; b—The ...
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##tihuan2##This paper presents an analytical study on the vibration characteristics of partially-embedded single piles subjected to vertical harmonic loads. The derived solution allows accounting for the contribution of the second-order lateral vibrations of the pile to its response, by modelling the pile as a Rayleigh-Love rod. In addition, the effects of …
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##tihuan2##1. Introduction. Rock burst represents one of the most severe mining hazards affecting the safety in the coal mine [1].Among the control measures of rock burst disaster, Large Diameter Drilling (LDD) is a frequently-used method [2], LDD hole is usually 110 mm – 200 mm in diameter and 10 m – 35 m in depth, which aims to reduce the value of peak …
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##tihuan2##Dynamics & Vibration. Large vertical pumps usually have a flexible casing and structure with different excitation frequencies located relatively close to natural frequencies. As such, they are susceptible to resonant vibration and high vibration during operation. In-depth vibration studies and verifications are needed for such pumps.
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##tihuan2##The ISO 10816-3 standard provides criteria for evaluating the vibration of machinery according to measurements taken on non-rotating parts, such as bearings, bearing pedestals, or housings. It serves as a general guideline for determining overall machine condition based on the magnitude of vibration and changes in vibration levels …
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##tihuan2##tests, using large triaxial test; in terms of the number of load vibrations, di˚erent from the situation where the number of previous vibrations is small, the number of load cycles is set to ...
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##tihuan2##Based on the research background of large section roadway with top coal (LSRTC) in thick coal seam mining in Wangzhuang Coal Mine, ... Shock and Vibration. Volume 2021, Issue 1 4474895. Research Article. ... about the roadway axis, the stress conditions of the two fixed support ends are the same. The bending moment is M, the vertical force is F ...
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##tihuan2##The effect of different pedestrian densities (0.2, 0.5, 1, 1.5 and 4.6 persons/m2) on a pedestrian bridge is studied, the comfort level is evaluated according to the acceleration peak, and the ...
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##tihuan2##The lack of relevant guidelines on the vibration displacement of the machine body made it difficult to assess its safety. The maximum horizontal vibration displacement of the coal …
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##tihuan2##Considering the transverse inertia effect of pile, the vertical dynamic response of a large diameter pipe pile in viscoelastic soil layer is studied. The wave propagations in the outer and inner soil are simulated by three-dimensional elastodynamic theory and those in the pile are simulated by Rayleigh-Love rod theory. The vertical and …
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##tihuan2##Vibration is a major concern in coal mining with a shearer, and an accurate model that allows complex responses can analyze the overall vibration of the system. The large load impact on and severe ...
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##tihuan2##Based on the three-dimensional axisymmetric model which only considers the vertical wave effect of soil, the vertical vibration of a large diameter pipe pile is investigated considering the ...
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##tihuan2##coal areas in New Mexico, and a list of publications about each coal area. Acknowledgments This project is an update of Tabet and Frost's (1978) Coal fields and mines of New Mexico, published by the NMBMMR as Resource Map 10. As a compilation of on-going work on the coal resources of New Mexico, there are many people
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##tihuan2##Vibration is a major concern in coal mining with a shearer, and an accurate model that allows complex responses can analyze the overall vibration of the system. The large load impact on and...
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##tihuan2##CO2 gas explosion is an important technology for coal seam permeability enhancement and fracturing, but the stage division of its life cycle is unclear, and research on the use of radial vibration ...
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##tihuan2##Whole-body vibration (WBV) exposure measurements taken from 105 truck drivers employed in 19 mines and other workplaces were evaluated with the criteria prescribed in EU 2002/44/EC directive, BS ...
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##tihuan2##The high impact velocity and large volume of coal rock are more suitable for collecting coal rock identification vibration signals and are most likely to damage the caving mechanism. 5.
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##tihuan2##In the case of Xinzhouyao coal mine, the transmitted stress and lateral support pressure of the overlying coal pillars accounted for 78.3% and 16% of the vertical concentrated stress, respectively, and the areas closer to the overlying coal pillars were more susceptible to dynamic load disturbances.
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##tihuan2##The vibration events in underground coal mine can be divided into whole mine (WM) event, working face (WF) event and heading face (HF) event, and the WM …
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##tihuan2##Long shaking duration at these frequencies may cause large structural damage in Mexico City due to the accumulation of yielding cycles that lengthen the …
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