A new approach to simulate the supporting arch in a tunnel based on improvement of the beam element in FLAC3D

Li, Wei-teng; Yang, Ning; Li, Tingchun; Zhang, Yuhua; Wang, Gang

doi:10.1631/jzus.a1600508

Cited by 9 publications

(5 citation statements)

References 20 publications

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“…Concrete filled steel tube arch (CFST) was used for numerical simulation. CFST adopts beam unit [28,29]. CFST and bolt were arranged in the same section, as shown in figure 2(b).…”

Section: Arch Modelmentioning

confidence: 99%

“…According to the research conclusion of this paper, the concrete filled steel tube arch with higher strength can be used for roadway support. In order to meet the support strength requirements, professor Li Shucai's research group of Shandong University designed the support optimization scheme [28]. In the new scheme, the roadway is supported by concrete filled steel tube arch (SQCC150 × 8-C40) with a spacing of 0.8 m, as shown in figure 13.…”

Section: Field Applicationmentioning

confidence: 99%

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Numerical experimental study on combined support of bolt-arch in circular roadway

Yang,

Li,

Zhao

et al. 2024

Eng. Res. Express

Self Cite

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The deep soft rock roadway is in high stress environment, and the surrounding rock is prone to large deformation. Appropriate roadway cross-section form and high-strength support are effective control methods for surrounding rock deformation. Circular roadway is widely used in mine engineering because of its uniform stress and deformation, which gives full play to the characteristics of rock compression and non-tension. With the advantages of high strength, high cost performance and stability, the application of arch frame in deep soft rock roadway is increasing day by day. Based on this, based on the engineering background of deep roadway in extremely soft rock in sea area, numerical experiments were carried out using the FLAC3D bolt-arch fine numerical simulation platform. The progressive failure characteristics of bolt-arch combined support in soft rock roadway are revealed. The influence law of roadway section form, geostress grade and lateral pressure coefficient on support effect is clarified. The results show that: (1) Under the condition of deep soft rock, the surrounding rock deformation of circular roadway is uniform. Compared with the straight wall semi-circular roadway, the deformation is reduced by about 86% at most. (2) The failure of arch frame in circular roadway has a significant influence on the final control effect of surrounding rock. When the ground stress exceeds 15 MPa, the loss of bearing capacity of arch frame is instantaneous, and the deformation of surrounding rock increases suddenly. (3) When the support of circular roadway in deep soft rock fails, the axial force of bolt is very small, and it basically does not play a supporting role. According to the research results, the support optimization design is carried out, and the field verification is obtained.

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“…Concrete filled steel tube arch (CFST) was used for numerical simulation. CFST adopts beam unit [28,29]. CFST and bolt were arranged in the same section, as shown in figure 2(b).…”

Section: Arch Modelmentioning

confidence: 99%

Section: Field Applicationmentioning

confidence: 99%

Numerical experimental study on combined support of bolt-arch in circular roadway

Yang,

Li,

Zhao

et al. 2024

Eng. Res. Express

Self Cite

View full text Add to dashboard Cite

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“…The model size is 170 m ðlengthÞ × 150 m ðwidthÞ × 75 m ðheightÞ, the roadway height is 2 m, width is 4 m, and the vertical height of the cut seam is 8 m with an angle of 15°. The vertical down-ward stress is applied to the upper boundary of the model, the bottom is fixed, and both sides' horizontal displacement is restricted [31,32]. The Mohr-Coulomb model is adopted.…”

Section: Simulation Test Of Roof Motion Lawmentioning

confidence: 99%

A Control Approach of the Roof in No-Pillar Roadway Formed by Roof Cutting and Pressure Releasing

Lou

Zhu

et al. 2021

Geofluids

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Roof control is one of the eternal themes of mine pressure theory, and it is also a key step of roadway formed by roof cutting. Based on the analysis of abutment pressure distribution, the viewpoint of controlling roadway roof by roof cutting distance is put forward according to the failure limit of roadway roof, and the calculation method of roof cutting distance is given. Based on the Qiuji coal mine’s background, the numerical and field test study is conducted to verify the theoretical analysis, and the allowable variation range of roof cutting distance is obtained. The research shows that the roof cutting distance, abutment pressure, and roadway deformation are closely related. By controlling the roof cutting distance, the roadway roof can be placed in the low-stress area, the roadway deformation can be reduced, and the support cost can be saved. This study provides a theoretical basis for explaining the roadway’s abnormal mine pressure and controlling the roadway roof by roof cutting.

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“…FlAC 3D is a numerical modeling package for geotechnical analyses of soil, rock, constructs, and ground support, which has been widely used in the mining industry [26,27]. The analysis of the FLAC 3D modeling results could be helpful to explain the pressure-relief mechanism of the floor pressure-relief slot.…”

Section: Layout and Parameters Of Pressure-relief Slotmentioning

confidence: 99%

Combined Supporting Technology with Bolt-Grouting and Floor Pressure-Relief for Deep Chamber: An Underground Coal Mine Case Study

Xin-xian

Huang

Chen³

et al. 2018

Energies

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Based on the engineering geological conditions of the Number 2 chamber in the slope at Xinzhuang coal mine, which is located in the eastern part of Yongcheng City, Henan Province, China, the authors conducted a systematic research on the anchoring-grouting and the floor pressure-relief supporting technology by using theoretical analysis, numerical calculation and field industrial test. Results showed that: (1) the lithology of the surrounding rock was poor, and the stress and effective loading coefficient on the chamber surrounding rock were high due to the abutment pressure that was induced by the shaft protective pillar. Both of them resulted in the floor heave and the surrounding rock deformation damage of the chamber; (2) The numerical calculation showed that, after the floor pressure-relief slot was excavated in the head chamber, the vertical stress of the floor surrounding rock of chamber and the horizontal stress of the side surrounding rock were significantly reduced when compared with the stress before the pressure-relief, and the floor vertical displacement basically remained unchanged. So the floor pressure-relief slot could effectively control the chamber floor heave and was helpful for the long-term stability of the chamber. After the severe deformation chamber was renovated by using a combined support with bolt-mesh-shotcreting and anchor cables, several other techniques were also applied to ensure the stability of the chamber. The floor pressure-relief slot was excavated, both the roof and the sides surrounding rock of chamber were grouted with grouting bolt, and both sides and the floor (including pressure-relief slot) of the chamber were grouted with anchor cable bundles. After implementation of above systematic techniques, the surrounding rock of chamber is in a stable state, which demonstrated that the field test is successful. The combined supporting technology with the anchoring-grouting and the floor pressure-relief has an important practical significance for the long-term stability of the chamber to ensure the safe and efficient production of the mine.

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A new approach to simulate the supporting arch in a tunnel based on improvement of the beam element in FLAC3D

Cited by 9 publications

References 20 publications

Numerical experimental study on combined support of bolt-arch in circular roadway

Numerical experimental study on combined support of bolt-arch in circular roadway

A Control Approach of the Roof in No-Pillar Roadway Formed by Roof Cutting and Pressure Releasing

Combined Supporting Technology with Bolt-Grouting and Floor Pressure-Relief for Deep Chamber: An Underground Coal Mine Case Study

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