Research on the Mechanical Behavior and Rockburst Risk of the Deep-Buried Roadway at the Stratigraphical Boundary of Different Lithologies
It has been found in engineering practice that the degree of rockburst risk increases when roadway excavation occurs near the stratigraphical boundary of different lithologies. This study uses the 1276 m deep-buried roadway of a lead–zinc mine in Yunnan, China, as its engineering background. Based o...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/15/13/7026 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849429346958180352 |
|---|---|
| author | Chaoqun Chu Lei Xia Shunchuan Wu Shun Han Guang Zhang |
| author_facet | Chaoqun Chu Lei Xia Shunchuan Wu Shun Han Guang Zhang |
| author_sort | Chaoqun Chu |
| collection | DOAJ |
| description | It has been found in engineering practice that the degree of rockburst risk increases when roadway excavation occurs near the stratigraphical boundary of different lithologies. This study uses the 1276 m deep-buried roadway of a lead–zinc mine in Yunnan, China, as its engineering background. Based on a numerical analysis of this case, it investigates the mechanical behavior of surrounding rocks in different lithological formations and explores the causes of excavation-induced rockburst. Additionally, by changing the excavation strategy in a numerical simulation, the influence of the direction of roadway excavation on the degree of rockburst risk in the construction of different lithological formations is assessed. The results are summarized as follows: (1) When the tunnel passes from the C<sub>1</sub>b stratum (limestone) to the D<sub>3</sub>zg stratum (dolomite), an abnormal stress zone forms in the roof rock strata of the D<sub>3</sub>zg stratum (the lower plate of the stratum boundary). The rockburst risk level was evaluated by introducing the numerical rockburst index in this abnormal stress zone, which aligns closely with on-site rockburst investigation results. The rockburst risk is the greatest in the abnormal stress zone, which provides an external energy storage environment for the development of rockburst disasters. (2) Near the stratum boundary, the rockburst risk level when excavating from the D<sub>3</sub>zg stratum to the C<sub>1</sub>b stratum is greater than that when excavating from the C<sub>1</sub>b stratum to the D<sub>3</sub>zg stratum. The direction of tunnel excavation significantly affects the rockburst risk level during construction that crosses different lithological strata. These findings can provide a theoretical basis for the construction design of similar underground projects. |
| format | Article |
| id | doaj-art-2f3444b4926e41f3bfc3c3a410a8eb41 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-2f3444b4926e41f3bfc3c3a410a8eb412025-08-20T03:28:24ZengMDPI AGApplied Sciences2076-34172025-06-011513702610.3390/app15137026Research on the Mechanical Behavior and Rockburst Risk of the Deep-Buried Roadway at the Stratigraphical Boundary of Different LithologiesChaoqun Chu0Lei Xia1Shunchuan Wu2Shun Han3Guang Zhang4Department of Resources and Safety Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaDepartment of Resources and Safety Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaDepartment of Resources and Safety Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaDepartment of Resources and Safety Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaInformation Institution of Ministry of Emergency Management, Beijing 100029, ChinaIt has been found in engineering practice that the degree of rockburst risk increases when roadway excavation occurs near the stratigraphical boundary of different lithologies. This study uses the 1276 m deep-buried roadway of a lead–zinc mine in Yunnan, China, as its engineering background. Based on a numerical analysis of this case, it investigates the mechanical behavior of surrounding rocks in different lithological formations and explores the causes of excavation-induced rockburst. Additionally, by changing the excavation strategy in a numerical simulation, the influence of the direction of roadway excavation on the degree of rockburst risk in the construction of different lithological formations is assessed. The results are summarized as follows: (1) When the tunnel passes from the C<sub>1</sub>b stratum (limestone) to the D<sub>3</sub>zg stratum (dolomite), an abnormal stress zone forms in the roof rock strata of the D<sub>3</sub>zg stratum (the lower plate of the stratum boundary). The rockburst risk level was evaluated by introducing the numerical rockburst index in this abnormal stress zone, which aligns closely with on-site rockburst investigation results. The rockburst risk is the greatest in the abnormal stress zone, which provides an external energy storage environment for the development of rockburst disasters. (2) Near the stratum boundary, the rockburst risk level when excavating from the D<sub>3</sub>zg stratum to the C<sub>1</sub>b stratum is greater than that when excavating from the C<sub>1</sub>b stratum to the D<sub>3</sub>zg stratum. The direction of tunnel excavation significantly affects the rockburst risk level during construction that crosses different lithological strata. These findings can provide a theoretical basis for the construction design of similar underground projects.https://www.mdpi.com/2076-3417/15/13/7026rockburststratigraphical boundaryexcavation directionnumerical simulationbrittle shear ratemechanical behavior |
| spellingShingle | Chaoqun Chu Lei Xia Shunchuan Wu Shun Han Guang Zhang Research on the Mechanical Behavior and Rockburst Risk of the Deep-Buried Roadway at the Stratigraphical Boundary of Different Lithologies Applied Sciences rockburst stratigraphical boundary excavation direction numerical simulation brittle shear rate mechanical behavior |
| title | Research on the Mechanical Behavior and Rockburst Risk of the Deep-Buried Roadway at the Stratigraphical Boundary of Different Lithologies |
| title_full | Research on the Mechanical Behavior and Rockburst Risk of the Deep-Buried Roadway at the Stratigraphical Boundary of Different Lithologies |
| title_fullStr | Research on the Mechanical Behavior and Rockburst Risk of the Deep-Buried Roadway at the Stratigraphical Boundary of Different Lithologies |
| title_full_unstemmed | Research on the Mechanical Behavior and Rockburst Risk of the Deep-Buried Roadway at the Stratigraphical Boundary of Different Lithologies |
| title_short | Research on the Mechanical Behavior and Rockburst Risk of the Deep-Buried Roadway at the Stratigraphical Boundary of Different Lithologies |
| title_sort | research on the mechanical behavior and rockburst risk of the deep buried roadway at the stratigraphical boundary of different lithologies |
| topic | rockburst stratigraphical boundary excavation direction numerical simulation brittle shear rate mechanical behavior |
| url | https://www.mdpi.com/2076-3417/15/13/7026 |
| work_keys_str_mv | AT chaoqunchu researchonthemechanicalbehaviorandrockburstriskofthedeepburiedroadwayatthestratigraphicalboundaryofdifferentlithologies AT leixia researchonthemechanicalbehaviorandrockburstriskofthedeepburiedroadwayatthestratigraphicalboundaryofdifferentlithologies AT shunchuanwu researchonthemechanicalbehaviorandrockburstriskofthedeepburiedroadwayatthestratigraphicalboundaryofdifferentlithologies AT shunhan researchonthemechanicalbehaviorandrockburstriskofthedeepburiedroadwayatthestratigraphicalboundaryofdifferentlithologies AT guangzhang researchonthemechanicalbehaviorandrockburstriskofthedeepburiedroadwayatthestratigraphicalboundaryofdifferentlithologies |