Asymmetric deformation failure mechanism and support technology of roadways under non-uniform pressure from a mining disturbance

Tian, Maolin; Han, Lijun; Yang, Xuxu; Feng, Qiang; Meng, Qinglin; Xie, Yunyue; Li, Wenshuai; Ma, Chao

doi:10.1007/s10064-022-02710-2

Cited by 17 publications

(5 citation statements)

References 41 publications

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“…Because the roadway surrounding rock was fractured, a "Deep and shallow holes grouting" support scheme (Tian et al, 2022) was used to reinforce the roadway rock under the mining stress. Considering the performance of CUC grout materials and the degree of surrounding rock fragmentation, CUC 22-8 grouts with good fluidity and minimum volume shrinkage were selected as the grouting reinforcement material.…”

Section: Grouting Reinforcement Scheme Of the No 20322 Belt Roadwaymentioning

confidence: 99%

“…The high crustal stress and strong mine pressure can easily lead to the fracture of the roadway's surrounding rock (He, 2011; Li, Wang, et al, 2021; Li, Zhang, Li, Gao, et al, 2021; Meng et al, 2022; Tian et al, 2019; Yang et al, 2017), which causes difficulties for roadway support design and stability control. As an effective reinforcement option, grouting has generally been used to enhance the mechanical properties of fractured and broken rock masses (Li, Zhang, Li, Gao, et al, 2021; Lu et al, 2022; Pan et al, 2017; Tian et al, 2022). Grouting involves injecting grouts into the voids or joints and cementing the rock masses to increase the stability.…”

Section: Introductionmentioning

confidence: 99%

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Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks

Tian,

Chen,

Han

et al. 2023

Deep Underground Science and Engineering

Self Cite

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The fractured surrounding rocks of roadways pose major challenges to safe mining. Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks. The aim of this study is to develop highly efficient composite ultrafine cement (CUC) grouts to reinforce the roadway in fractured surrounding rocks. The materials used are ultrafine cement (UC), ultrafine fly ash (UF), ultrafine slag (US), and additives (superplasticizer [SUP], aluminate ultrafine expansion agent [AUA], gypsum, and retarder). The fluidity, bleeding, shrinkage, setting time, chemical composition, microstructure, degree of hydration, and mechanical property of grouting materials were evaluated in this study. Also, a suitable and effective CUC grout mixture was used to reinforce the roadway in the fractured surrounding rock. The results have shown that the addition of UF and US reduces the plastic viscosity of CUC, and the best fluidity can be obtained by adding 40% UF and 10% US. Since UC and UF particles are small, the pozzolanic effect of UF promotes the hydration reaction, which is conductive to the stability of CUC grouts. In addition, fine particles of UC, UF, and US can effectively fill the pores, while the volumetric expansion of AUA and gypsum decreases the pores and thus affects the microstructure of the solidified grout. The compressive test results have shown that the addition of specific amounts of UF and US can ameliorate the mechanical properties of CUC grouts. Finally, the CUC22‐8 grout was used to reinforce the No. 20322 belt roadway. The results of numerical simulation and field monitoring have indicated that grouting can efficaciously reinforce the surrounding rock of the roadway. In this research, high‐performance CUC grouts were developed for surrounding rock reinforcement of underground engineering by utilizing UC and some additives.

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Section: Grouting Reinforcement Scheme Of the No 20322 Belt Roadwaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks

Tian,

Chen,

Han

et al. 2023

Deep Underground Science and Engineering

Self Cite

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“…The damage mechanism of the bottom roadway under the influence of mining and the deformation of the roadway's peripheral rock are also analyzed in depth. However, the peripheral rock of the bottom roadway under the influence of mining is in the nonuniform stress area, and the peripheral rock of the bottom roadway is affected by the two-way unequal compressive stress [30]. In the past, most scholars have focused on the change in support pressure when they studied the damage characteristics of the bottom plate and neglected the influence of a two-way unequal compressive stress field on damage to the bottom plate roadway.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Perimeter Rock Damage in a Bottom-Pumping Roadway under the Influence of Mining Activities and Rational Location Studies: A Case Study

Bai,

Wu,

Yang

et al. 2024

Applied Sciences

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With the aim of determining the damage characteristics and a reasonable positional arrangement of the surrounding rock in a bottom-pumping roadway influenced by mining in a high-gas mine, the boundary equation for the plastic zone of the surrounding rock in a circular roadway under an unequal compressive stress field was adopted to analyze the relationship between the distribution characteristics of the plastic zone of the bottom-pumping roadway and the stability of the rock surrounding the bottom-pumping roadway under different bidirectional stress ratios. This was carried out in the bottom-pumping roadway of the working face of Licun coal mine 3301 as the engineering background, where the nature of the coal seams mined is bituminous coal, and the absolute gas outflow is 0.5 m3/min−1. A numerical simulation was used to analyze the distribution characteristics of the surrounding rock stress and the bidirectional stress ratio, as well as the deformation and damage characteristics of the surrounding rock at different positions in the bottom-pumping roadway. A numerical simulation was applied to analyze the distribution characteristics of the surrounding rock stress and the two-way stress ratio, as well as the deformation and damage characteristics of the rock surrounding the bottom-pumping roadway when the bottom-pumping roadway was arranged in different locations. The results show that, with an increase in the bidirectional stress ratio, the plastic zone of the perimeter rock in the bottom-pumping roadway shows nonuniform “butterfly” distribution characteristics, which seriously affects the stability of the rock on the perimeter of the roadway; the stress on the bottom plate of the working face after excavation can be divided into four areas according to the size of the bidirectional stress ratio and the stress loading and unloading states. In addition, the size of the perimeter rock deformation can be sorted into four areas according to the damage range of the perimeter of the rock plastic zone in the bottom-pumping roadway. The size of the deformation in the surrounding rock can be sorted as follows: unpressurized high-stress ratio > unpressurized stress ratio stable area > pressurized low-stress ratio area > original rock stress ratio area. Accordingly, we found that the reasonable location of the bottom-pumping roadway is arranged at the 15 m position outside the hollow area below the coal pillar, along the limestone upper medium-grained sandstone layer along the bottom. The study’s results were applied to the field. The industrial experiments on the site show that the deformation of the surrounding rock is reasonable when the bottom-pumping roadway is dug along the limestone roof and arranged 15 m outside the fault of the mining hollow area below the coal pillar.

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“…Depending on the rock layer inclination angle, the stress zones around the mine working at horizontal and vertical occurrence of layers are distributed symmetrically relative to the vertical mine working axis, whereas with inclined rock mass stratification, the symmetry changes, but with an increase in the inclination angle, the symmetry axis shifts [18], [18]. Asymmetry of failure zones leads to unfavorable behavior of the mass around the mine working [20].…”

Section: Introductionmentioning

confidence: 99%

Assessing stability of mine workings driven in stratified rock mass

Imashev,

Suimbayeva,

Zhunusbekova

et al. 2024

Min. miner. depos.

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Purpose.The research purpose is to assess the stability of mine workings driven in a stratified rock mass by studying the influence of the stratified rock bedding angle on the rock mass stress-strain state (SSS). Methods. The research uses both experimental and numerical methods. Experimental studies are carried out using rock samples with different angles of rock layer occurrence, while numerical modeling is performed using the RS2 (Geotechnical Finite Element Analysis) software based on the generalized Hoek-Brown failure criterion. The studies are carried out on models covering the border area of the mine workings driven in the mass with the angles of rock occurrence from 0 to 75°. Findings. Experimental and numerical studies have shown that when the rock layer inclination angle changes, significant changes occur in the stress concentration zones around the mine workings. An increased rock layer inclination angle is accompanied by a change in stress distribution, which is important for assessing the stability of mine workings. A particularly strong influence is observed at the angles of rock occurrence 30° and above. Originality. The research novelty is in revealing the patterns in the stress distribution in the stratified rock masses depen-ding on the rock layer inclination angle. Research results provide new data on the rock interaction mechanisms in difficult geological conditions. Practical implications. The results obtained can be used in the planning and operation of mine workings in difficult geological conditions. By taking into account the changes in stress zones caused by the rock layer inclination angle, it is possible to improve the safety and efficiency of mining operations.

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Asymmetric deformation failure mechanism and support technology of roadways under non-uniform pressure from a mining disturbance

Cited by 17 publications

References 41 publications

Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks

Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks

Characteristics of Perimeter Rock Damage in a Bottom-Pumping Roadway under the Influence of Mining Activities and Rational Location Studies: A Case Study

Assessing stability of mine workings driven in stratified rock mass

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