Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence
The accurate prediction and evaluation of stress and displacement fields of surrounding rock is the fundamental premise for the deformation control of soft rock tunnels under high geo-stress condition. However, due to the complicated mechanical characteristics of soft rock with confining pressure in...
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| Format: | Article |
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MDPI AG
2023-06-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/12/7305 |
| _version_ | 1797596253523017728 |
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| author | Yucang Dong Hai Zhang Zhengguo Zhu Yongquan Zhu |
| author_facet | Yucang Dong Hai Zhang Zhengguo Zhu Yongquan Zhu |
| author_sort | Yucang Dong |
| collection | DOAJ |
| description | The accurate prediction and evaluation of stress and displacement fields of surrounding rock is the fundamental premise for the deformation control of soft rock tunnels under high geo-stress condition. However, due to the complicated mechanical characteristics of soft rock with confining pressure influence, the current numerical simulation method usually regards the mechanical parameters of surrounding rock as constant and ignores the variation of these parameters in the simulation process, which leads to results that cannot accurately reflect the mechanical behavior of surrounding rock. Therefore, this paper firstly investigates the effect of confining pressure on deformation and strength parameters for soft rock and proposes corresponding variable models for mechanical parameters with the confining pressure influence. Secondly, a transversal loop discriminant update procedure is proposed and introduced into the iteration calculation process of FLAC<sup>3D</sup>, thus forming an improved numerical simulation method. This improved method can integrally consider the mechanical parameter variation of surrounding rock with variable confining pressure and realize the automatic update for such a parameter with its variable stress state. Finally, as an application example, an improved expression of longitudinal deformation profile (LDP) for tunnels considering the confining pressure influence is proposed based on numerous simulation results for a soft rock tunnel obtained by this proposed method. |
| first_indexed | 2024-03-11T02:47:53Z |
| format | Article |
| id | doaj.art-9b01b0fa0bd84c689d2b21b2c05e1c6e |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T02:47:53Z |
| publishDate | 2023-06-01 |
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| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-9b01b0fa0bd84c689d2b21b2c05e1c6e2023-11-18T09:12:00ZengMDPI AGApplied Sciences2076-34172023-06-011312730510.3390/app13127305Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure InfluenceYucang Dong0Hai Zhang1Zhengguo Zhu2Yongquan Zhu3School of Urban and Geology Engineering, Hebei GEO University, Shijiazhuang 050031, ChinaSchool of Urban and Geology Engineering, Hebei GEO University, Shijiazhuang 050031, ChinaState Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang 050031, ChinaState Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang 050031, ChinaThe accurate prediction and evaluation of stress and displacement fields of surrounding rock is the fundamental premise for the deformation control of soft rock tunnels under high geo-stress condition. However, due to the complicated mechanical characteristics of soft rock with confining pressure influence, the current numerical simulation method usually regards the mechanical parameters of surrounding rock as constant and ignores the variation of these parameters in the simulation process, which leads to results that cannot accurately reflect the mechanical behavior of surrounding rock. Therefore, this paper firstly investigates the effect of confining pressure on deformation and strength parameters for soft rock and proposes corresponding variable models for mechanical parameters with the confining pressure influence. Secondly, a transversal loop discriminant update procedure is proposed and introduced into the iteration calculation process of FLAC<sup>3D</sup>, thus forming an improved numerical simulation method. This improved method can integrally consider the mechanical parameter variation of surrounding rock with variable confining pressure and realize the automatic update for such a parameter with its variable stress state. Finally, as an application example, an improved expression of longitudinal deformation profile (LDP) for tunnels considering the confining pressure influence is proposed based on numerous simulation results for a soft rock tunnel obtained by this proposed method.https://www.mdpi.com/2076-3417/13/12/7305soft rock tunnelmechanical parametervariable modelnumerical simulationlongitudinal deformation profile |
| spellingShingle | Yucang Dong Hai Zhang Zhengguo Zhu Yongquan Zhu Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence Applied Sciences soft rock tunnel mechanical parameter variable model numerical simulation longitudinal deformation profile |
| title | Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence |
| title_full | Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence |
| title_fullStr | Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence |
| title_full_unstemmed | Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence |
| title_short | Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence |
| title_sort | numerical simulation method for tunnel excavation considering mechanical characteristic variation of soft rock with the confining pressure influence |
| topic | soft rock tunnel mechanical parameter variable model numerical simulation longitudinal deformation profile |
| url | https://www.mdpi.com/2076-3417/13/12/7305 |
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