Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling
In the present study, a numerical model is first calibrated against the crack networks and pressure attenuation data in laboratory blasting test. Then, based on the calibrated numerical model, two-hole plane models are developed and used to perform a series of simulations of smoothwall blasting in d...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-08-01
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| Series: | Underground Space |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2467967423000272 |
| _version_ | 1797797238401925120 |
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| author | Xudong Li Kewei Liu Jiacai Yang Yanyan Sha Ruitao Song |
| author_facet | Xudong Li Kewei Liu Jiacai Yang Yanyan Sha Ruitao Song |
| author_sort | Xudong Li |
| collection | DOAJ |
| description | In the present study, a numerical model is first calibrated against the crack networks and pressure attenuation data in laboratory blasting test. Then, based on the calibrated numerical model, two-hole plane models are developed and used to perform a series of simulations of smoothwall blasting in deep tunnelling subjected to in-situ stress. The evolutions of rock fracture and excavation damage zone in the roof/floor and sidewalls under different far-field hydrostatic pressure and anisotropic in-situ stress conditions are numerically investigated. The findings in numerical modelling are also analytically interpreted with the stress distributions around the designed tunnel perimeter and perimeter borehole. The numerical and analytical results show that the variations of rock cracking and excavation damaged zone induced by smoothwall blasting with in-situ stress are mainly attributed to the high tangential compressive stress concentration around the remaining rock after inner primary blasts and the tensile stress acting on the wall of perimeter hole, which control the crack propagation and initiation respectively. At last, the implications of findings for practical smoothwall blasting in deep tunnelling are discussed. |
| first_indexed | 2024-03-13T03:45:10Z |
| format | Article |
| id | doaj.art-ff4dd168610440049568c8889f736ddc |
| institution | Directory Open Access Journal |
| issn | 2467-9674 |
| language | English |
| last_indexed | 2024-03-13T03:45:10Z |
| publishDate | 2023-08-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Underground Space |
| spelling | doaj.art-ff4dd168610440049568c8889f736ddc2023-06-23T04:43:26ZengKeAi Communications Co., Ltd.Underground Space2467-96742023-08-011196115Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnellingXudong Li0Kewei Liu1Jiacai Yang2Yanyan Sha3Ruitao Song4School of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, China; Corresponding author.School of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaDepartment of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Stavanger 4021, NorwaySchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaIn the present study, a numerical model is first calibrated against the crack networks and pressure attenuation data in laboratory blasting test. Then, based on the calibrated numerical model, two-hole plane models are developed and used to perform a series of simulations of smoothwall blasting in deep tunnelling subjected to in-situ stress. The evolutions of rock fracture and excavation damage zone in the roof/floor and sidewalls under different far-field hydrostatic pressure and anisotropic in-situ stress conditions are numerically investigated. The findings in numerical modelling are also analytically interpreted with the stress distributions around the designed tunnel perimeter and perimeter borehole. The numerical and analytical results show that the variations of rock cracking and excavation damaged zone induced by smoothwall blasting with in-situ stress are mainly attributed to the high tangential compressive stress concentration around the remaining rock after inner primary blasts and the tensile stress acting on the wall of perimeter hole, which control the crack propagation and initiation respectively. At last, the implications of findings for practical smoothwall blasting in deep tunnelling are discussed.http://www.sciencedirect.com/science/article/pii/S2467967423000272Smoothwall blastingIn-situ stressCrack propagationExcavation damaged zoneStress distributionNumerical simulation |
| spellingShingle | Xudong Li Kewei Liu Jiacai Yang Yanyan Sha Ruitao Song Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling Underground Space Smoothwall blasting In-situ stress Crack propagation Excavation damaged zone Stress distribution Numerical simulation |
| title | Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling |
| title_full | Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling |
| title_fullStr | Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling |
| title_full_unstemmed | Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling |
| title_short | Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling |
| title_sort | numerical study on the effect of in situ stress on smoothwall blasting in deep tunnelling |
| topic | Smoothwall blasting In-situ stress Crack propagation Excavation damaged zone Stress distribution Numerical simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2467967423000272 |
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