Wall normal stress characteristics in an experimental coal silo

An, Haiquan; Wang, Xin; Fang, Xiaohong; Liu, Zhen; Liang, Cai

doi:10.1016/j.powtec.2020.09.016

Cited by 17 publications

(6 citation statements)

References 34 publications

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“…Many scholars have paid attentions to the complex dynamic lateral pressure on the silo wall 17 – 20 . Horabik et al 17 studied the mechanical properties of granular materials and their effects on load distribution and discussed the evolution of the constitutive model of granular materials under the mechanical framework.…”

Section: Introductionmentioning

confidence: 99%

“…Lei et al 19 established a new theoretical model of lateral pressure on the silo wall and put forward the empirical expression of stress state transition between quasi-static fluid and quasi-Janssen fluid. An et al 20 studied the normal stress characteristics on silo wall by arranging pressure sensors to measure dynamic lateral stress. Unfortunately, the above investigations do not consider the influences of storage materials and silo deformation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modified lateral pressure formula of shallow and circular silo considering the elasticities of silo wall and storage materials

Liang

2022

Sci Rep

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For the shallow and circular silo (SCS), when the aspect ratio is between 1.0 and 1.5, the lateral pressure especially dynamic pressure may cause destruction if the size of the silo is large. This paper proposed a modified calculation method of lateral pressure on the silo wall of SCS, considering the elasticities of silo wall and storage materials. The availability of shallow silo and deep silo methods, and the modified method were compared with the experiment and simulation. The results show that the Rankine’s formula is too conservative for the static lateral pressure, and the results of the modified method and Janssen formula are close to that of the experimental and simulation. For the dynamic lateral pressure calculation, Rankine theory is unsafe for the discharging load. The relative error of the dynamic lateral pressure based on Janssen theory is between 20 and 30%, which is too large. The dynamic lateral pressure calculated by the modified method is in good agreement with that of the experimental and simulation, and the relative error is less than 10%. Therefore, the modified method of lateral pressure formula is reasonable, which can provide guidance for the safety design of silo structure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modified lateral pressure formula of shallow and circular silo considering the elasticities of silo wall and storage materials

Liang

2022

Sci Rep

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“…For the shaft coal pocket, the motion characteristics of the bulk material were complex for the bulk storage material in the bottom coal bunker. 7 , 8 The damage of the coal bunker wall at the bottom of the shaft could bring a series of problems such as a mine shutdown. Yang et al 9 analyzed the localization mechanism of the sand particle system during the shear process through discrete element software.…”

Section: Introductionmentioning

confidence: 99%

“…As coal is the main non-renewable energy, it is necessary to investigate the underground bunker of coal fuel storage devices in coal mine production. − The underground shaft coal pocket serves as a throat project of the main transportation system of the coal mine, which has a great significance to ensure the safe production of the coal mine. − A three-dimensional physical similarity simulation experiment was an effective research method to investigate the loading, deformation, and loss of the shaft coal pocket wall in coal mining engineering practice. For the shaft coal pocket, the motion characteristics of the bulk material were complex for the bulk storage material in the bottom coal bunker. , The damage of the coal bunker wall at the bottom of the shaft could bring a series of problems such as a mine shutdown. Yang et al analyzed the localization mechanism of the sand particle system during the shear process through discrete element software.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Physical Similarity Simulation Experiments for a Transparent Shaft Coal Pocket Wall in Coal Mines

Liu

Xie

et al. 2022

ACS Omega

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To explore the variations of the loading, deformation, and loss and to determine the mechanical state, loss characteristics, and stability for the shaft coal pocket wall in coal mines under a dynamic-static load, this paper innovatively attempts to conduct a three-dimensional physical similarity test of a transparent material shaft coal pocket, as well as the experiments of loading and unloading coal in the shaft coal pocket using different bulk storage materials 80 times. Then, the deformation, pressure, the surrounding rock, and the flow pattern of the silo wall were discussed considering the existence of the warehouse wall support. The characteristics of shaft wall deformation and surrounding rock stress cracks during the unloading were analyzed with the help from multiple integrated test systems such as strain gauges, pressure sensors, borehole peeps, and other comprehensive test systems. The results indicated that different dispersion particles have a significant impact on the strain of the shaft wall. When using the coal particles as storage materials, the overpressure coefficient of the shaft wall is up to 1.95 times higher than using dry sand particles. The particle size and internal friction angle of the bulk particles impact significantly on the deformation of the wall, where the cohesive force among the dispersed particles produced by the compaction effect has a certain influence on the side pressure of the silo wall. During the unloading process, coal particles were easier to obtain an arching phenomenon than dry sand particles. In addition, the number of bulk arching could be significantly reduced under the conditions of the warehouse wall support. The “weak rock stratum” in the surrounding rock plays a major role in controlling the deformation and failure development of the shaft wall. The three-dimensional physical simulation experiment of the transparent shaft wall truly reproduces the field engineering practice, and the physical simulation results are verified by numerical simulation analysis.

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“…Many scholars have paid attentions to the complex dynamic lateral pressure on the silo wall [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Modified Lateral Pressure Formula of Shallow and Circular Silo Considering the Elasticities of Silo Wall and Storage Materials

Liang

2021

Preprint

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For the shallow and circular silo(SCS), when the aspect ratio is between 1.0 and 1.5, the lateral pressure especially dynamic pressure may cause destruction if the size of the silo is large. In general, the lateral pressures should be calculated simultaneously according to the shallow silo and the deep silo calculation formulas based on Rankine’s earth pressure theory and Janssen’s theory, respectively, and the larger value of them should be adopted. However, whether the two formulas are reasonable needs to be verified. This paper proposed a modified calculation method of lateral pressure on the silo wall of SCS, considering the elasticities of silo wall and storage materials. The availability of shallow silo and deep silo methods, and the modified method were compared with the experiment and simulation. The results show that the Rankine’s formula is too conservative for the static lateral pressure, and the results of the modified method and Janssen formula are close to that of the experimental and simulation. For the dynamic lateral pressure calculation, Rankine theory is unsafe for the discharging load. The relative error of the dynamic lateral pressure based on Janssen theory is between 20% and 30%, which is too large. The dynamic lateral pressure calculated by the modified method is in good agreement with that of the experimental and simulation, and the relative error is less than 10%. Therefore, the modified method of lateral pressure formula is reasonable, which can provide guidance for the safety design of silo structure.

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Wall normal stress characteristics in an experimental coal silo

Cited by 17 publications

References 34 publications

Modified lateral pressure formula of shallow and circular silo considering the elasticities of silo wall and storage materials

Modified lateral pressure formula of shallow and circular silo considering the elasticities of silo wall and storage materials

Three-Dimensional Physical Similarity Simulation Experiments for a Transparent Shaft Coal Pocket Wall in Coal Mines

Modified Lateral Pressure Formula of Shallow and Circular Silo Considering the Elasticities of Silo Wall and Storage Materials

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