Study on Characteristic and Mechanism of Deformation and Failure of Roadway Surrounding Rock in Deep Mining

Li, Yong; Zhao, Yixin; Wang, Chen; Li, Xue Hua

doi:10.4028/www.scientific.net/amr.734-737.819

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…Overburden fracture is the channel of water seepage, migration and water storage space. The seepage disaster process of rock strata is the result of the coupling effect of a water-bearing body and consolidated rock mass [17]. According to the deformation and instability process of roof strata, the elastic theory of pore-fissure is referred to [18][19][20][21], and the water inrush process of coal seam mining is divided into three "solid-liquid" coupling action stages:…”

Section: "Solid-liquid" Coupling Water Inrush Mechanism In Coal Seam ...mentioning

confidence: 99%

The Spatial Evolution Law and Water Inrush Mechanism of Mining-Induced Overburden in Shallow and Short Coal Seam Group

Pan

Jiang

et al. 2022

Sustainability

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In order to grasp the overburden evolution law of the shallow and short coal seam group, based on the key bed theory, a mechanical analysis of the longitudinal expansion of mining-induced overburden fractures in the coal seam group was carried out, and the spatial evolution characteristics of mining-induced overburden fractures were simulated by the numerical simulation method. The results show that in the process of working face advancement, with the continuous instability and failure of the overburden, the size and shape of the fracture network are also changed. The repeated mining of the lower coal seam further causes the secondary activation of the upper overburden, which makes the roof fractures of the partially compacted goaf violently move again. The “channel source” and “space source” continue to carry out the process of “generation-expansion-compression-generation-expansion”, in combination with pore fracture elastic theory. The water inrush characteristics of the whole coal seam are divided into three “solid-liquid” coupling stages: the original gap seepage stage, the initial water discharge stage of mining fissures and the water inrush stage of fractured rock mass. The steady value of water inflow and its variation characteristics with time are predicted by using the formula of deep well flow in a confined aquifer.

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Section: "Solid-liquid" Coupling Water Inrush Mechanism In Coal Seam ...mentioning

confidence: 99%

The Spatial Evolution Law and Water Inrush Mechanism of Mining-Induced Overburden in Shallow and Short Coal Seam Group

Pan

Jiang

et al. 2022

Sustainability

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“…It is a significant piece of infrastructure, and its establishment is the most challenging project related to underground mine construction. Compared with a shallow shaft, the geological conditions and stress state of a deep shaft are more complex, especially under the action of strong excavation disturbance (Li et al 2013;Walton et al 2018). Polytropic strata and stress conditions produce increasingly complicated mechanical response mechanisms and distinct response characteristics as depth increases (Mishra et al 2017;Li et al 2020;Zhang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Sequential stress control and delayed support in deep shaft construction

et al. 2022

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In constructing hard rock mine deep shafts, the failure caused by high stress is a significant problem. A construction section extending from the -930 m to -1271 m level of a 1527 m deep shaft was selected as a case study. Q, RMR, and GSI rock mass quality classifications of the surrounding rock were obtained to determine the shaft’s maximum unsupported sinking cycle height in different construction sections. The potential failure mode, failure zone shape, and failure depth of the surrounding rock shaft under high stress were then analyzed theoretically, empirically, and by numerical simulation, sequential stress control and delayed support technology was proposed according to the results. The temporary and permanent support timing parameters were calculated and verified by the empirical chart, numerical simulation, convergence-confinement theory, and theoretical formula. Results show that the surrounding rock in all the construction sections from -930 m to -1271 m belongs to the mild or severely pressure squeezed strata. The potential failure mode is stress-controlled, and the failure zone of the surrounding rock is “ear” shaped. Temporary support strengthens the rock mass, improves the shear capacity of surrounding rock, and prevents the broken rock from falling but does not release stress. Permanent support, conversely, cannot bear the stress of surrounding rock. The stress and elastic strain energy in rock mass should be released to the greatest extent possible before installing permanent support; it is not advisable to install it too early. The time and cycle height of delayed permanent shaft support were comprehensively determined to be four days and 16 m, respectively. The numerical simulation and safety factor proof show that the sequential stress control process effectively minimizes stress in surrounding rock and ensures long-term shaft stability.

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“…Practice has demonstrated that whether an anchor can provide sufficient pre-tightening force is key to realizing active support, effectively controlling the deformation of the surrounding rock in the roadway, and improving the anchor supporting quality in the deep roadway, especially in roadway support under broken rock mass conditions. Grouting anchor measures can effectively improve the integrity of the surrounding rocks in the roadway and effectively enhance the cohesion and internal friction angle of the surrounding rocks [1] [2] [3] [4], thereby increasing the selfsupporting ability of the surrounding rocks and significantly improving the roadway-supporting effect and quality. However, because the length of the free segment of the grouting anchor is usually quite short, the application of pre-tightening force is very limited [5] [6] [7], which fails to meet the demand of active support.…”

Section: Introductionmentioning

confidence: 99%

Review on the Anchoring Mechanism and Application Research of Compression-Type Anchor

Jing¹,

Hu²

2016

ENG

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To apply the compression-type anchor to deep roadways, this paper analyzes and summaries the bearing mechanism, shear stress distribution of the grout body and engineering application of the compression-type anchor. The analysis shows that the compression-type anchor has the advantages of reasonable grout body stress form, high loading capacity, good corrosion resistance and durability. The analysis also indicates that further study on the stress distribution of the compression-type anchor's grout body and the design of a new compression-type anchor with high strength initial support, simple structure, and small diameter that is suitable for the surrounding rock in deep roadway engineering is necessary to apply compression-type anchor supporting technology to the deep roadway.

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Study on Characteristic and Mechanism of Deformation and Failure of Roadway Surrounding Rock in Deep Mining

Cited by 3 publications

References 7 publications

The Spatial Evolution Law and Water Inrush Mechanism of Mining-Induced Overburden in Shallow and Short Coal Seam Group

The Spatial Evolution Law and Water Inrush Mechanism of Mining-Induced Overburden in Shallow and Short Coal Seam Group

Sequential stress control and delayed support in deep shaft construction

Review on the Anchoring Mechanism and Application Research of Compression-Type Anchor

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