Abstract. In the mine construction, the surface pre-grouting technology is an important method to prevent water blast in excavation process of vertical shaft when the shaft must pass through the thick, water-rich and high water-pressure bedrock aquifer.With the increasing depletion of shallow coal resources,China’s coal mining is developing in the direc-tion of deepening and large-scale development.The annual production capacity Research progress of deep shaft construction mechanics
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The exploitation of deep mineral resources requires the construction of vertical shafts as channels for personnel movement, ventilation, drainage, and ore lifting The exploitation of deep mineral resources requires the construction of vertical shafts as channels for personnel movement, ventilation, drainage, and ore lifting Research progress of deep shaft construction mechanics
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Deep mining is an inevitable trend in China and the world, for which the construction of deep and large vertical shafts is the primary task. A shaft sinking The stability of vertical shafts has always been a difficult problem in mining engineering, especially with the increasing of mining depth. In order to keep the engineering works stable, it is necessary to Deformation Failure Mechanism of Deep Vertical
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Shaft stability evaluation (SSE) is one of the most crucial and important tasks in view of the role of vertical shaft in mining engineering, the accuracy of which Vertical shaft is an upright shaft excavated for mining activities. There are exposed shafts and blind shafts, generally with a circular section. A vertical shaft with the Vertical Shaft, Types and Functions of SpringerLink
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It has been nearly 60 years since the technology was used to reform wall rock of vertical shaft in coal mine in China for the first time, and the existing technology Last Updated: 09 Sep 2023. Request PDF Evaluation of vertical shaft stability in underground mines: comparison of three weight methods with uncertainty theory Shaft stability evaluation (SSEEvaluation of vertical shaft stability in
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A shaft is defined as a vertical or inclined permanent opening that gives access and services various levels of a mine. Shafts are designed according to their required purpose and depending on the Groundwater inrush hazard has always been a great threat to the construction of vertical shafts in coal mines. Generally, the failure of the water-resisting coal pillar under coupled stress-seepage conditions around the vertical shaft is the main reason for the generation of the water inrush channel. In order to understand the mechanical Failure Characteristics of the Water-Resisting Coal Pillar
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To address the support problem of large-diameter drilling shafts in the west area of Zhangji coal mine, a thinner shaft lining structure composed of double layers of steel plate and high-performance concrete Shaft stability evaluation (SSE) is one of the most crucial and important tasks in view of the role of vertical shaft in mining engineering, the accuracy of which determines the safety of on-site workers and the production rate of target mine largely. Existing artificial methods are limited to the amount of data and complex process of Evaluation of vertical shaft stability in underground mines: comparison
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3.1 Establishment of the Calculation Model 3.1.1 Element Type. Using ANSYS, a finite element model of the hybrid-fiber-reinforced concrete shaft wall structure was established. Short-section excavation construction is typically adopted for the shaft wall of vertical shafts in deep rock strata and for the outer wall of frozen shafts in deep loose Roof supports include both intrinsic supports, such as roof bolts, and standing supports. The key characteristics of any support include its maximum load-carrying capacity, stiffness, and residual(PDF) FUNDAMENTALS OF COAL MINE ROOF SUPPORT
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Vertical Shaft, Types and Functions of. Vertical shaft is an upright shaft excavated for mining activities. There are exposed shafts and blind shafts, generally with a circular section. A vertical shaft with the pithead directly leading to the ground is called an exposed shaft, and a shaft with the pithead not directly leading to the ground isto improve the level of safety monitoring during the construction and service of coal mine shafts. On the basis of theoretical research and computational data, the numerical simulation and simula- introduce a new technical means approach for the safety monitoring of vertical shafts and shafts in coal mines, thereby demonstrating theArticle Research on Coupling Adsorption Experiments for
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wall rock of vertical shafts in coal mines in China WANG Hua1,2,3,4 1Mine Construction Branch, China Coal Research Institute, Beijing 100013, China; 2Institute of Mine Construction,Deep mining is an inevitable trend in China and the world, for which the construction of deep and large vertical shafts is the primary task. A shaft sinking headframe is a basic structure for supporting various hoisting and sinking equipment during vertical shaft construction. The design of the shaft sinking headframe is challenging due to the Frontiers Behavior of large shaft sinking headframe
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Joint Frequency in the Rock Mass Rating 2014 Classification System Based on Field P-wave Propagation Velocity Tests: A New Rating Method. Jun Liu. Guoliang Dai. Weiming Gong. Technical Note. Published: 10 April 2021. Pages: 4697 4708. Volume 39, issue 6 articles listing for Geotechnical and Geological Engineering.In coal mining, the vertical shaft is an important channel for moving personnel up and down, ventilation, drainage, and coal lifting [1] [2] [3], and its supporting structure is called the shaftResearch progress of deep shaft construction mechanics
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The Zhuxianzhuang coal mine is located in Huaibei Plain, China. There are three vertical shafts in the industrial square, namely the main shaft, auxiliary shaft, and air shaft. Among them, the design net To address the support problem of large-diameter drilling shafts in the west area of Zhangji coal mine, a thinner shaft lining structure composed of double layers of steel plate and high-performance concrete is proposed herein. Firstly, a series of tests of high-performance concrete preparation were carried out, and the optimized mix ratio of Applied Sciences Free Full-Text Testing of a Dual-Steel
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Safety state of vertical shafts in coal mines, as the key channel for ensuring production and safety, is important. Since the 1980s, more than 110 concrete shafts constructed in deep alluvium zones (with the thickness more than 100 m) in different regions, such as Huaibei, Xuzhou, and Yanzhouhave successively suffered from non Although there are two types of underground coal mines access via vertical shafts and drift mines (incline shafts), depending on the depth of the coal seam and the surrounding terrain this article will concentrate on mine hoist applications that are used in mines that have vertical access to the coal seam: i.e., the mine hoists thatShaft mining- latest advances in hoist safety and energy
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The practice of construction of the coal and ore mines provides various designs for the steel angle headframes, both sinking headgear and permanent headframe: 4-post headframe, 4- * CorrespondingTherefore, four vertical shafts to be newly constructed are employed to serve the activities of deep underground mining. Designed parameters of shafts are illustrated in Table 1 . The waste shaft that will be used to transport coal gangue and other materials from underground roadways is selected as the case to be investigated in this Simultaneous Operations of Pregrouting and Shaft Drilling in
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The deepest shaft currently under construction, they said, is one for the Huaibei Coal Mining’s Xinhu mine in Anhui province, at 1,037 m depth and 8.1 m diameter. Average shaft depths increased from less than 200 m during the country’s first Five-Year Plan (in the mid-1950s) to over 570 m in the eighth (mid-1990s), with 10% of all shaftsWithin a study, mine shafts from the United Kingdom Midlands have been analyzed, resulting in an approximation of more than 3,000 usable mines with a total storage capacity of 1.07 GWh involving(PDF) Gravity energy storage with suspended weights for abandoned mine
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