Improved energy balance theory applied to roadway support design in deep mining

Wang, Chunlai; Liu, Lu; Elmo, Davide; Shi, Feng; Gao, Ansen; Ni, Pengpeng; Zhang, Binchuan

doi:10.1088/1742-2140/aab3a0

Cited by 13 publications

(8 citation statements)

References 24 publications

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“…With the continuous progress of society, the demand for mineral resources around the world continuously increases. The shallow resources are gradually exhausted, and open-pit mining gradually transits to underground mining [ 1 , 2 ]. Underground mining will inevitably lead to a large number of goaf in the strata, which is the main cause of rock instability and safety accidents.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on tailings cementation by MICP technique with immersion curing

et al. 2022

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The filling mining method is an effective method for controlling ground stress and preventing surface subsidence in the mining field during exploitation of underground resources. Tailings can be utilized as the filling material, so as to realize the reuse of industrial waste. However, utilization of the traditional Portland cement as the cementing material for tailings leads to groundwater pollution. In addition, production of Portland cement results in consumption of a great amount of ore and air pollution. In this paper, a tailings cementation method by using the microbial induced calcite precipitation (MICP) technique with immersion curing is proposed. Tailings are cemented by the MICP technique with aerobic bacteria (Sporosarcina pasteurii) under a soaked curing environment. The variable control method is applied to investigate the factors influencing the cementation effects by the MICP technique with Sporosarcina pasteurii, including the bacterial solution concentration, the cementing solution concentration, the particle size of tailings, and the curing temperature. The results indicate that: when OD600 of the Sporosarcina pasteurii solution is 1.6, the urea concentration in the cementing solution is 0.75 mol/L, the tailings are raw materials without grinding, and the curing temperature is 30°C, the cementation effect is the best. In view of uneven calcification during MICP with Sporosarcina pasteurii, mixed Sporosarcina pasteurii and Castellaniella denitrificans are used for tailings cementation. Higher strength of cemented tailings is achieved. It is proved that the MICP technique with mixed aerobic bacteria and facultative anaerobes is an effective method for tailings cementation.

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Section: Introductionmentioning

confidence: 99%

“…When calcium ions are added externally, calcium carbonate precipitates are formed in the environment. The reaction equation is shown in (1)(2)(3)(4)(5)(6). The mechanism of the MICP technique based on urea hydrolysis is relatively simple and a large amount of calcium carbonate is precipitated within a short period.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on tailings cementation by MICP technique with immersion curing

et al. 2022

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“…ere are many research results about deep mining, which can provide a reference for this study. Some scholars have studied the deformation mechanism of deep soft rock roadway using the angles of theory [12][13][14], numerical simulation [15][16][17], and field measurements [18,19]. A previous study has also studied the measures to control the deformation of roadways [20,21].…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism of Gob‐Side Roadway under Overlying Coal Pillar Multiseam Mining

Wang

Song

et al. 2021

Shock and Vibration

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Roadway deformation and rock burst are the two key challenges faced by the safe operation of coal mines. Aiming at the issue of large deformation of the gob-side roadway under coal pillars in multiseam mining, this study has considered the case of the 8308 panel of Xinzhouyao coal mine in China. Based upon a combination of theoretical analysis, numerical simulations, and engineering practices, the mechanical model of “stress and deformation quantitative calculation of gob-side roadway under overlying coal pillars” was established in this study. The analytical solutions of the vertical stress distribution and the plastic zone of the gob-side roadway under overlying coal pillars were obtained. Finally, the accuracy of the mechanical model was verified using numerical simulations. The results showed that the coal pillar, upright above the gob-side roadway, and the cantilever roof around the gob-side roadway were the main factors leading to stress concentration and deformation around the gob-side roadway. For the particular cases considered in this study, the peak stress of the gob-side roadway could reach 1.8 times of the self-weight stress of overlying strata. The rates of the contribution of the gob-side roadway’s overlying pillar and the cantilever roof around the gob-side roadway to peak stress were 78.3% and 16%, respectively. The obtained results have an essential reference significance for stress calculations and rock burst prevention design of gob-side roadway under overlying coal pillars in multiseam mining.

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“…Song et al 11,12 analyzed the rock burst mechanism of the surrounding rock of roadways from the perspective of strain energy storage and dissipation. Xie et al 13‐15 adopted the strain energy method to study the surrounding rock deformation and support design of roadways.…”

Section: Introductionmentioning

confidence: 99%

Transfer and dissipation of strain energy in surrounding rock of deep roadway considering strain softening and dilatancy

Liu

Lü

et al. 2020

Energy Science & Engineering

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In this study, the transfer and dissipation of strain energy in the surrounding rock of a deep roadway were analyzed, considering the objective strain softening and dilatancy behaviors. The strain energy increment was decomposed, and its variation was analyzed based on the incremental plastic flow theory; then, a numerical simulation was conducted for verification and further analysis. The results were verified by the field monitoring data of a coal mine gateway. The results show that in the elastic stage, the volumetric elastic strain energy density Uev decreases, while the shear elastic strain energy density Ues increases. In the plastic stage, both Uev and Ues decrease. The volumetric plastic strain energy density Upv is negative, and its absolute value increases, leading to strain energy accumulation. In contrast, the shear plastic strain energy density Ups is positive and increases, leading to strain energy dissipation. Considering strain softening, the elastic strain energy decreases, the plastic strain energy increases, and the region of strain energy dissipation expands. Considering dilatancy, the plastic strain energy varies more significantly, and the effect of strain softening is amplified. The strain energy is transferred from the deep part to the shallow part of the elastic zone and then to the plastic zone. The preexisting and input strain energies in the plastic zone are transformed into considerable amounts of plastic strain energy and then dissipated. Thereafter, a significant plastic strain appears, leading to the large deformation of the surrounding rock.

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Improved energy balance theory applied to roadway support design in deep mining

Cited by 13 publications

References 24 publications

Experimental study on tailings cementation by MICP technique with immersion curing

Experimental study on tailings cementation by MICP technique with immersion curing

Failure Mechanism of Gob‐Side Roadway under Overlying Coal Pillar Multiseam Mining

Transfer and dissipation of strain energy in surrounding rock of deep roadway considering strain softening and dilatancy

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