The mining industry, especially coal mining, may severely affect the spatial and temporal evolution of groundwater. To provide a potential model outlining the hydrogeochemical evolution of groundwater as influenced by coal mining, a multi-layer groundwater system in a coal mining area was investigated. A total of 76 groundwater …

Sample Preparation. As illustrated in Fig. 1, the limestone samples for this experiment were obtained from a mine blast pile and processed through core drilling, standard specimen cutting, and double-sided grinding.The length-to-diameter ratio of the specimens for the three-dimensional dynamic–static combined cyclic impact test was 1.0 …

mining, process of extracting useful minerals from the surface of the Earth, including the seas.A mineral, with a few exceptions, is an inorganic substance occurring in nature that has a definite chemical composition and distinctive physical properties or molecular structure. (One organic substance, coal, is often discussed as a mineral as …

In the study, the limestone samples were taken from a tunnel section in Yunyang County, Chongqing, China (Fig. 2). The limestone was transported back to the laboratory. And after drilling, cutting, grinding, soaking and drying, cylindrical standard rock samples with φ100×50 mm dimensions were obtained.

Underground stone mining operations in the United States commonly utilize a room-and-pillar mine layout with drill-and-blast production methodology for the …

To reveal the evolution mechanism of concrete permeability under stress-seepage coupling in drilling shaft linings of water-rich and weakly cemented formations, this study conducted an experimental investigation on concrete permeability under various combinations of confining pressure and osmotic water pressure.

The deep mining of coal mines in North China faces the serious threat of water inrush from karst aquifers in the coal seam floors, and regional advance grouting technology (RAGT) is an effective ...

Limestone is a sedimentary rock composed primarily of calcium carbonate with the occasional presence of magnesium. Most limestone is biochemical in origin meaning the calcium carbonate in the stone originated from shelled oceanic creatures. Limestone can also be chemical in origin as is the case with travertine.

Well drilling involves the process of drilling a hole in the ground to explore for, or extract, natural gas or petroleum, to inject fluid from the surface into a subsurface …

Abstract. In earthquake engineering, dynamic response of rock is a hot topic for investigating rock mechanism characteristics. In this article, limestone collected from the Hongshiyan landslide area induced by the 2014 "8.03" Ludian earthquake in southwest China is used to conduct multi-stage cyclic loading tests. The test results show that as …

The degree of water-rock interaction affecting the accurate identification of mine water inrush source. • The cation exchange controls the formation of low Ca 2+ (Mg 2+), and high Na + (K +) mine water.. Eliminating the influence of cation exchange, Ordovician limestone, 14 th limestone, and water inrush samples have the same …

Surface miners can also be used for the selective mining of thin seams resulting in better control over the product grade. Sometimes for deeper mining of minerals, a requirement of the larger operating surface area is not possible due to limitations posed by nearby habitations; surface mining allows higher bench slope due to elimination of …

Coal mining in North China is widely threatened by underlying Ordovician karstic limestone groundwater. This study focused on the top portion of the Ordovician limestone and its water resisting properties at a mine in North China, where the total thickness of the Ordovician limestone ranges between 300 and 1600 m. A packer pump …

When one travels to Indiana, they may notice that the architecture heavily relies on the use of limestone for many of its buildings. Limestone is a very important part to Indiana's history as in the 19th century, limestone helped drive Indiana's economy, and build the foundation of Indiana as we know it today.

This newsletter affords a new analytic calculation for the shovel–dumper combination in open cast limestone mine evolution of the only and two galaxy probability density function (PDF).

We analyzed the regional nature of China's coal mine water disasters based on three aspects: the main water source, water-conducting passages, and threat level of water hazards. The development of water hazard control technology in China's coal mines, including exploration and assessment of hydrogeological conditions, water …

together with the role of 3D seismic exploration, combined with drilling, to identify the complex geological structures. The eective grouting technology and the stability of a collapse column in the mining process were analyzed by numerical simulation and conrmed by MS monitoring. The necessity of grouting reinforcement is demonstrated along

Evolution of limestone mining areas in Nanwendeng, Xingwangdian, and Xiguozhuang village from 1985 to 2020. The mining areas are colored off white, while …

About sixteen boreholes pass through Ordovician limestone strata in the mining area, with the thickness of 48.7 m to 92.5 m. According to the drilling data, the lithology is dense without dissolution and no water leakage has rarely occurred during the borehole implementation. ... By analyzing the data of limestone drilling exposed in …

From 2015 to 2021, five massive pillar collapses occurred at four underground stone mines in the eastern USA. These events resulted in powerful airblasts that damaged mine infrastructure and mobile equipment, seriously injured miners, and disrupted underground travelways. Each of these pillar collapses propagated through …

Statistical analysis was used to study the hydrogeochemical evolution of an Ordovician limestone aquifer group in the Hancheng mining area. Before mining, the groundwater flowed from northwest to ...

Excavators are used to remove the topsoil and surface miners were used to mine limestone. As no drilling and blasting are involved, there is a reduction in air pollution and high noise generation. The surface miners also have an inbuilt dust suppression system (Indian Bureau of Mines 2014). 4.2.3 Dump Stabilization at Halki …

The mineral industry in India is undergoing a technological upheaval that is usually referred to as modern-day reforms or modernization.In various mining organizations, this has been reflected in terms of some noted characteristic features, such as exchanging knowledge, upgrading existing practices, and allowing private …

Groundwater chemical composition can be changed due to long-term coal mining activities, but it was unclear how it was induced in Taiyuan Formation limestone (TFL) regarding the lack of relevant ...

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Significant changes in vegetation and temperature have been observed in the surrounding area as a result of limestone mining activity, which may be linked to the …

Mining was a traditional skill in older days and considered to be an art; however, technological advances have slowly turned this art into an applied skill …

the Groundhog mine occurs in the Hanover limestone. This may in part be due to the 3- to 10-m-thick parting shale which overlies the Hanover limestone and which may have served to dam mineralizing fluids in the underlying beds. Because the sedimentary layers in the Groundhog mine are almost horizontal, with an average dip of 3 ø

DOI: 10.1007/s42461-023-00885-0 Corpus ID: 265416387; Influence of Joint Orientation and Spacing on Induced Rock Mass Damage due to Blasting in Limestone Mines @article{Himanshu2023InfluenceOJ, title={Influence of Joint Orientation and Spacing on Induced Rock Mass Damage due to Blasting in Limestone Mines}, …

Hydrogeochemical evolution of Taiyuan Formation limestone water under the disturbance of water inrush from karst collapse column in Taoyuan Coal Mine, China ... Taoyuan Coal Mine used rapid directional hole drilling technology and a high-quality and efficient grouting process to plug the inrush site within a time frame of 116 days. Then …