Overlying rock strata
WebMar 15, 2024 · sublayers of the overlying rock strata led to the. delamination of the sublayers. (2) When the working face advanced to 70 m, the col-lapsed height at the gob … Web【摘 要】现场大量工程实践表明厚松散层移动与常规基岩移动有所差异.目前岩层移动规律的研究主要侧重在两方面:一方面是采场岩层控制主要研究煤层附近顶板基岩的破断和移动规律,另一方面是地测工程主要研究地表松散层的沉降规律.将这两者有机相联,希望能更精准反映基岩和松散层的整体变形 ...
Overlying rock strata
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WebMar 26, 2024 · As the last section of the working face advances, the overlying rock strata structure in the goaf gradually stabilizes, and the roadway is excavated alongside the edge of the stable goaf. Although the roadway lies in the low section of lateral bearing stress, small stress concentrations may lead to a big deformation of the roadways surrounding … WebMar 15, 2024 · The overlying rock strata above the immediate roof remained intact. With the increase of distance of advancement, different amount of settlement of the sublayers of …
WebAug 10, 2024 · Figure 3 shows the results from the caving and deformation of the overlying rock strata with the advancing 29,210 working face. As shown, after the 24,207 and … WebMay 6, 2024 · As the working face advanced, the area of the overlying rock strata affected by the mining continued to increase, and the subsidence value gradually increased. After …
WebMay 19, 2024 · The effects of roof cutting techniques on the movement law of the overlying strata and deformation features of the surrounding rock in gob-side entry retaining mines were studied using 200 working ... WebMar 1, 2024 · Based on the earlier analysis, when the upper coal seam is exploited, the separation distance and the ultimate subsidence value of the overlying strata can be used …
WebApr 11, 2024 · With increasing distance, the space available for the overlying strata to collapse downward decreased sharply, and the degree of rock seam collapse declined less. At this point, larger separation fractures were formed between the rock seams, and the length of the broken fractures decreased along the direction of the overburden thickness, …
WebJan 1, 2024 · After examining the roof strata movement pattern of fully mechanized mining (or caving) with large mining height, a roof structural model for large mining-height stopes … nakwon cafe seoulWebThe results of the analyses indicated that control function loss of the KS aggravated the failure of the overlying strata and expanded the original water-flowing fractured zone, which grew by 91.49% and 23.40% in short-distance and medium-distance multiseam mining. meds for a coldWebIn the vertical direction, the fracture distribution pattern and the range of the overlying rock layer were gradually stable. In the horizontal direction, fracture development on the … meds for addison\u0027s disease in dogsWebNov 1, 2024 · Request PDF On Nov 1, 2024, Zhijie Wen and others published Overlying strata structural modeling and support applicability analysis for large mining-height stopes Find, read and cite all the ... meds for actinic keratosisWebMay 25, 2024 · The biggest changing rate for the displacement gradually reduced from 20.52 mm to 5.08 mm. When the BMS was more than 1 times the strength of coal, the displacement of overlying coal and rock strata was close to 0. From the perspective of surrounding rock and pillar, after the mining, the displacement reached an equilibrium state. meds for abscess toothWebIn geology and related fields, a stratum (PL: strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible … meds for adrenocortical insufficiencyWebMar 15, 2024 · sublayers of the overlying rock strata led to the. delamination of the sublayers. (2) When the working face advanced to 70 m, the col-lapsed height at the gob increased. e caving gangue. meds for aggression in children