Numerical Simulation Analysis of New Steel Sets Used for Roadway Support in Coal Mines

Li, Jingkai; Zhang, Jinpeng; Wang, Changxiang; Fang, Kai; Liu, Limin; Wang, Wenjing

doi:10.3390/met9050606

Cited by 10 publications

(9 citation statements)

References 33 publications

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“…During the tunnel excavation of the Trasvasur tunnels (Canary Islands, Spain) (Pérez-Romero et al, 2007), found that it is advisable to seal off the excavation as soon as possible to prevent change due to the decompression of the swelling clay levels and the absorption of water from the tunnel itself. Researching the deformation mechanism of swelling rock (Zhang et al, 2021b;Isago et al, 2015;Oldecop and Alonso, 2012), it was found that these measures that was the implementation of bolts (Waldemar 2015; Jeong et al, 2015), reinforced linings (Li et al, 2019;Bilir and Sarıgül, 2021;Korzeniowski et al, 2015), allowable deformation to reduce expansion pressure measurement (Aksoy et al, 2012;Sun and Wang, 2011) and so on can greatly reduce the probability of large deformation of the tunnel. Currently, most of the research on the stability of the tunnel is focused on the deformation of the surrounding rock in the process of construction, while the research on secondary lining failure during tunnel operation is limited.…”

Section: Introductionmentioning

confidence: 99%

Failure Characteristics and Treatment Measures of Tunnels in Expansive Rock Stratum

Yang

Liu

et al. 2022

Front. Earth Sci.

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During the operation period, disasters caused by the expansion of tunnel surrounding rock often occurs, but the understanding of this problem is still insufficient. This study investigated the disaster that occurred in the tunnel based on numerical simulation on a case in Dugongling, China. First, the main diseases, including lining cracks, pavement uplift and cable trench overturning and so on, of the tunnel were investigated in the field. According to the geological data, the expansion and softening of the surrounding rock was likely to be the main cause of lining cracking. Then, this paper proposed a formula for calculating the expansion force of expansive rock when the water content changes. Based on the expansion force calculation formula, the most severely damaged section was numerically analyzed, and the results were compared with the on-site monitoring data. According to the simulation results, the deformation of the surrounding rock and the stress of the supporting structure were studied. The research showed that the expansion and softening of the surrounding rock led to an increase in the load acting on the lining structure, which intensified the development of disasters. Finally, four reinforcement schemes were proposed and simulated, and the best reinforcement scheme was evaluated. The results of this study can provide a reference for the design and construction of this project and similar projects.

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Section: Introductionmentioning

confidence: 99%

Failure Characteristics and Treatment Measures of Tunnels in Expansive Rock Stratum

Yang

Liu

et al. 2022

Front. Earth Sci.

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“…In China, the coal in the eastern region has been nearly mined out, and the coal mining has been transferred to the western region, which is rich in coal reserves and has become a new energy base [1][2][3][4]. Compared with the eastern region, the coal seams in the western region are mostly shallow coal seams beneath gully terrain [5,6].…”

Section: Introductionmentioning

confidence: 99%

Study on Influence Laws of Strata Behaviors for Shallow Coal Seam Mining beneath Gully Terrain

Wang¹,

Li²,

Wu³

et al. 2021

Shock and Vibration

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The study on influence laws of strata behaviors is the basic guarantee of safety mining for shallow coal seam beneath gully terrain. Taking 3302 mining face of Zhujiamao Coal Mine as the engineering background, the laws of strata behaviors for shallow coal seam mining beneath gully terrain are studied by field detection, theoretical analysis, and numerical simulation. The strata pressure observation and the hydraulic support working resistance show that the dynamic strata behaviors appear violently during mining beneath the gully bottom. The theoretical analysis shows that the rotation and breaking of key stratum beneath gully bottom under nonuniform load is the fundamental cause of strong dynamic strata behaviors. The numerical simulation of overburden movement and fissure development characteristics shows that the strata behaviors beneath the gully bottom are stronger than the strata behaviors beneath other areas. Additionally, according to the laws of dynamic strata behaviors, the safety measures for mining beneath gully bottom are put forward.

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“…As a coagulant, gypsum can simulate the mechanical strength of rock in a limited range, which is difficult to satisfy the requirements of deformation or mechanical strength of similar materials. The mechanical strength of similar materials is greatly affected by moisture, and most studies focus on the selection and ratio of materials, but there are few studies on the residual moisture content of similar materials during the drying process [62][63][64][65][66][67][68]. The effect of the combination of the ratio, density and residual water content of similar materials on their own physical and mechanical properties is relatively rare.…”

Section: Introductionmentioning

confidence: 99%

Experimental development process of similar material of water resisting layer in physical model test

et al. 2021

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The stability evaluation of water resisting layer in the process of coal mining is the key to study the law of water and soil loss and prevent the loss of water resources. The development and proportioning of similar materials are the basis to study the stability of water resisting layer by physical simulation. A new type of similar material considering water characteristics was developed through orthogonal experiments. The similar material was composed of river sand, bentonite, silicone oil, vaseline, and water. Determine the best test development process. First of all, the proportion test scheme is designed based on the orthogonal test. Then, the influence of cement concentration, mass ratio of silicone oil to vaseline and other components on the density, uniaxial compressive strength, elastic model and Poisson’s ratio of similar materials was analyzed by range analysis. Finally, the multiple linear regression equation between the parameters and the composition of similar materials for water resisting layer is obtained, and the optimal composition ratio is further determined according to the relationship between the test influencing factors and the mechanical properties of similar materials. The results show that the selected raw materials and their proportioning method are feasible. The content of river sand plays a major role in controlling the density and Poisson’s ratio of similar materials. The mass ratio of aggregate to binder is the main factor affecting the uniaxial compressive strength and elastic modulus of similar materials, while the cementing concentration has the second largest influence on the density, uniaxial compressive strength, elastic modulus and Poisson’s ratio of similar materials. Determining the cementing concentration that matches the design of similar material model tests is critical to improving test accuracy and provides a reference for the preparation of similar materials for water resisting layer under different requirements during the development of similar materials.

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Numerical Simulation Analysis of New Steel Sets Used for Roadway Support in Coal Mines

Cited by 10 publications

References 33 publications

Failure Characteristics and Treatment Measures of Tunnels in Expansive Rock Stratum

Failure Characteristics and Treatment Measures of Tunnels in Expansive Rock Stratum

Study on Influence Laws of Strata Behaviors for Shallow Coal Seam Mining beneath Gully Terrain

Experimental development process of similar material of water resisting layer in physical model test

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