Temperate Highland Peat Swamps on Sandstone: evaluation of mitigation and remediation techniques Summary Key points • Longwall mining beneath upland peat swamps may fracture the sandstone substrate and alter the swamp’s water balance. To date, no strategies—other than changes in mine

2014-6-29  St. Peter Sandstone Mineral Resource Evaluation, Missouri, USA 3 Introduction The St. Peter Sandstone is a sedimentary rock formation belonging to the Ordovician System, composed almost entirely of silica in the form of quartz sand grains. In Missouri, the St. Peter Sandstone is well-sorted and fine- to medium-grained

2018-9-1  This study used life cycle assessment (LCA) tool to evaluate the overall impact of artisanal sandstone mining (ASAM) on the environment and human health. The impact categories assessed in the study included: resource depletion, global warming, ozone layer depletion and acidification.

2018-1-1  Mining hazard maps were created to combine four geologic criteria that showed geological variability that could affect longwall-induced stresses in the sandstone and abutment stresses in the gateroad pillars . The geologic criteria in descending importance were overburden depth, longwall caving height, interval to sandstone above the Pocahontas No. 3 seam, Sandstone 1 thickness, and sandstone

2015-11-1  The analysis results indicate that: (1) the sandstone layer which overlies the coal layer is the key layer to the stability of the mining roof; (2) the safe distance from the mining boundary should be at least 400 m if the proposed structure is to be built near the active mining site; (3) the safe distance may be reduced to 150 m if the proposed structure is located at an inactive mining site.

In this work, mode I fracture toughness of Berea Sandstone and Mancos Shale is measured by combining semi-circular bend test (SCB) and digital image correlation (DIC).

2020-6-17  Scale range is different for both samples, because Berea Sandstone undergoes larger u displacements. Peak load of Berea Sandstone sample is 562 N, while for Mancos Shale, the peak load is 956 N. FPZ in Berea starts developing at 461 N which is 82% of peak load. Image “c” shows fully developed FPZ at 554 N which is 99% of peak load.

Scioto sandstone samples with average liquid permeability around 0.3 mD and average porosity around 14–16% were used.

Research into the effect of mining subsidence on colliery spoil heaps, and field investigations were carried out to monitor deformations of selected spoil heaps due to mining. In the study presented herein, deformation of existing slopes due to mines was also considered as an input for an underground mining evaluation

Mechanical, acoustic, and fracture behaviors of yellow sandstone specimens under triaxial monotonic and cyclic loading

2020-3-3  Entropy Evaluation Method for Sandstone Uranium Reservoir Characteristics Based on Convex Hull Search Abstract: The continuity and homogeneity of sandstone uranium deposits are inherent characteristics that affect in situ leaching performance indexes and have important guiding effects on the optimization of mining design.

2018-1-1  Mining hazard maps were created to combine four geologic criteria that showed geological variability that could affect longwall-induced stresses in the sandstone and abutment stresses in the gateroad pillars (Fig. 4). The geologic criteria in descending importance were overburden depth, longwall caving height, interval to sandstone above the ...

2018-5-11  sandstone sector. succeeded in doing so. The evaluation affirms that the program has met one of The 2013-15 Sandstone program focused on lateral the expected outputs in terms of creating an enabling engagement with multi-stakeholders of the sector to

Evaluation of permeability damage caused by drilling and fracturing fluids in tight low permeability sandstone reservoirs April 2019 Journal of Petroleum Science and Engineering 175(6)

A comprehensive evaluation index is established and used to judge the co-mining feasibility of 14 wells (J-1 to J-14) in the No. 8 coal seam and adjacent sandstone layers in the Linfen block.

2018-5-3  Evaluation of production capacity to tight sandstone reservoir based on logging and mud logging curve Yin Sen-lin，Cheng Le-li，Liu Zi-xiong，Chen Ling，Chen Gong-yang，Feng Wei，Luo Ying-chun 1.Institute of Mud Logging Technology and Engineering ...

2020-6-17  Success of a hydraulic fracturing operation depends on the height and width of the induced fractures. One of the critical components controlling fracture size is fracture toughness of the formation. In this work, mode I fracture toughness of Berea Sandstone and Mancos Shale is measured by combining semi-circular bend test (SCB) and digital image correlation (DIC).

2020-11-27  The thermal conductivity (TC) of rock has a general application in safety assessment and engineering optimization of deep geological engineering practices such as geothermal mining and nuclear waste disposal. Determining the TC of rock by using a TC model is a convenient and effective method for such evaluation

2016-4-21  The Nubian Sandstone is a thick sequence of clastic and thin carbonate sediments in the Jebel El Zeit section of eastern Egypt. The sequence is composed mainly of sandstone with shale and minor carbonate interbeds and was deposited in

Sandstone petrography is widely considered to be a powerful tool for determining the origin and tectonic setting of ancient terrigenous deposits (Blatt, 1967; Dickinson, 1970; Pettijohn et al., 1972).Shale geochemistry has been considered to represent the average crustal composition much better than any other detrital sedimentary rock because of its grain-size homogeneity and postdepositional ...

2 天前  St. Peter Sandstone Mineral Resource Evaluation, Missouri, USA. Basic Information. Author: Davis J.G. Description: The St. Peter Sandstone is typically a well-sorted, friable, ultra-pure, fine- to medium-grained, quartzose sandstone with silica content higher than 99 weight percent in places. The sand grains are well-rounded, highly spherical ...

2020-3-3  Entropy Evaluation Method for Sandstone Uranium Reservoir Characteristics Based on Convex Hull Search Abstract: The continuity and homogeneity of sandstone uranium deposits are inherent characteristics that affect in situ leaching performance indexes and have important guiding effects on the optimization of mining design.

2018-1-1  Mining hazard maps were created to combine four geologic criteria that showed geological variability that could affect longwall-induced stresses in the sandstone and abutment stresses in the gateroad pillars (Fig. 4). The geologic criteria in descending importance were overburden depth, longwall caving height, interval to sandstone above the ...

2014-8-21  weak. The mining coal height of water-flowing fractured zone also should be take into consideration in evaluation, Take the total sandstone thickness within this scope as the relative thickness of sandstone aquifer. The percentage of sand-shale The water-richness of coal measures sandstone also has close relationship with coal measures

A comprehensive evaluation index is established and used to judge the co-mining feasibility of 14 wells (J-1 to J-14) in the No. 8 coal seam and adjacent sandstone layers in the Linfen block.

2018-5-3  Evaluation of production capacity to tight sandstone reservoir based on logging and mud logging curve Yin Sen-lin，Cheng Le-li，Liu Zi-xiong，Chen Ling，Chen Gong-yang，Feng Wei，Luo Ying-chun 1.Institute of Mud Logging Technology and Engineering ...

2020-11-27  The thermal conductivity (TC) of rock has a general application in safety assessment and engineering optimization of deep geological engineering practices such as geothermal mining and nuclear waste disposal. Determining the TC of rock by using a TC model is a convenient and effective method for such evaluation

Sandstone petrography is widely considered to be a powerful tool for determining the origin and tectonic setting of ancient terrigenous deposits (Blatt, 1967; Dickinson, 1970; Pettijohn et al., 1972).Shale geochemistry has been considered to represent the average crustal composition much better than any other detrital sedimentary rock because of its grain-size homogeneity and postdepositional ...

Then, sandstone rock samples were used for experimental evaluation, and the feasibility of the theoretically determined damage variable was verified. Finally, through theoretical and experimental comparison analysis, we developed a correlative damage model for sandstone

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