2024 Overlying rock strata

Overlying rock strata

Author: utqh

August undefined, 2024

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 increased. e caving gangue. 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 …

Development characteristics of the rock fracture field in strata ...

WebIn all strata, the main coal-bearing area is the Carboniferous strata and Permian strata of Shanxi and Taiyuan formation, which belongs to the type of coal-bearing rock series in North China. The main coal seam is the No. 3 coal seam, with a thickness of about 7.86~10.02 m and an average thickness of about 9.00 m. WebNov 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 ... how to train your dragon glow

The Effect of Backfilling Materials on the Deformation of Coal and Rock …

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 to judge whether the rock strata will break or fall. The overlying strata formed some structures in the fractured zone during the mining stage of the lower coal seam. 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 … 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, … how to train your dragon girl hookfang

Characteristics of Mining-Induced Fractures Under Inclined

Discrete element modeling of a mining-induced rock slide

WebIn 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 overlying strata moved forward synchronously with the mining of the working face. In addition, the cracks on the overlying strata showed complete formation. 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 … how to train your dragon girl twinWebJul 30, 2024 · The release of energy occurs along a fault. A fault is a sharp break in the crustal rocks. Rocks along a fault tend to move in opposite directions. As the overlying … how to train your dragon girl name

"WebNov 25, 2024 · Furthermore, the overlying strata action is mainly transferred to the upper coal pillar in front of the working face, so that the pressure value of the residual coal before advancing 378.4 m to move the frame reaches the maximum value of 58.5 MPa in the process of re-mining, and the coal pillar after moving the frame is not sufficient to support … " - Overlying rock strata

Overlying rock strata

Numerical study on movement of dynamic strata in combined

WebMay 7, 2024 · The macro-micro mining response of the surrounding rock and overlying strata towards the transformation from open-pit to underground mining is examined in the … WebMay 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.

Did you know?

WebSep 30, 2024 · The overlying strata of the working face in the footwall of the fault caved along the fault surface, and the vertical displacement was largest at 185 m (middle of the footwall working face). WebOct 5, 2024 · The fracture development of the overlying strata after coal mining is an important guarantee of efficient gas drainage. In order to explore the fracture evolution …

WebConfining pressures within the earth are caused by the weight of the overlying rock pushing downward and from all sides. ... Rock bands appearing on one side of the fold axis are duplicated on the other side. For basins and domes, strata exposed at the surface form concentric circles around a central point (Figure 10.16). 7. Figure 10.5: ... WebApr 25, 2024 · The theoretical calculation results show that there are “one main two sub” key strata in the overlying strata of 130204 working face, which play an important role in controlling rock movement.

WebJan 1, 2024 · If the overlying rock stratum is a “single key stratum” structure that fails periodically, single periodic fluctuation will appear between the support pressure and the advancing step pressure; if the overlying rock stratum is a “double key strata” structure that fails periodically, the support resistance profile will fluctuate periodically (Fig. 2), where a …

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 …

WebJan 4, 2024 · The breaking features and stress distribution of overlying strata in a steeply dipping coal seam (SDCS) differ significantly from those in a near-horizontal one. In this … how to train your dragon green deathWebApr 13, 2024 · The seismic facies of volcaniclastic rocks show a series of broken and deformed structures, which usually cause the overlying strata to bend upward, indicating the presence of a violent volcanic eruption. The well log curves show dentate characteristics with high gamma values (Fig. 11-III). iv. Intrusive rocks how to train your dragon grim gnasher dragonsWebIn 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 … how to train your dragon grim gnasherWebApr 14, 2024 · Lithologically, the upper Permian, consisting of limestone with frequent lamination, is distinctive from the overlying Lower Triassic strata 27 of argillaceous, soft sedimentary rocks. how to train your dragon grimmelWebNov 25, 2024 · Furthermore, the overlying strata action is mainly transferred to the upper coal pillar in front of the working face, so that the pressure value of the residual coal … how to train your dragon girl costumeWebMar 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 … how to train your dragon gobber voiceWebJun 21, 2024 · Accurate perception of the key stratum instability can improve the safety of coal mining and also provide a basis for alleviating overlying rock strata destruction and environmental disturbance. To efficiently evaluate the instability of the key stratum and its threat to safe mining and environmental protection, the fracture characteristics and … how to train your dragon golden dragon