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| Numerical modeling of vibration and damage of surrounding rock in tunnel blasting by using 4D-LSM |
| ZHAO Gaofeng1, XU Zhichao1, HAO Yimin1, HU Xiaodong1, DENG Xifei2
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1. School of Civil Engineering, Tianjin University, Tianjin 300350, China;
2. China Tiesiju Civil Engineering Group, Hefei 230023, Anhui, China |
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Abstract The application of 4D-LSM in rock blasting was studied. The fundamental principles of 4D-LSM in tunnel surrounding rock blasting were introduced, including system equations, non-reflective boundary conditions and rock fracturing model based on multi-body failure criterion. Aiming at the blasting of tunnel surrounding rock, 4D-LSM was used to establish the surrounding rock vibration analysis model, single hole blasting model and surrounding rock damage model under blasting. On the basis of different tunnel blasting design schemes, these models were processed through geometric simplification and boundary condition simplification to realize the quantitative analysis of the peak load velocity of the key points of the tunnel blasting surrounding rock for the given blasting scheme. Aiming at the problem of single-hole free-surface blasting, the simulation effects of DLSM and 4D-LSM were compared, and the advantages of 4D-LSM in dealing with large dynamic deformation and failure of rocks were demonstrated. The numerical modelling of surrounding rock damage zone depth under different blasting design parameters was realized by 4D-LSM. The safety classification and ranking of different blasting schemes were realized through the prediction and analysis of particle vibration velocity and damage zone depth predicted by 4D-LSM. The optimization of the tunnel rock blasting design could be realized by quantitative sensitivity analysis and ranking of blasting safety based on numerical simulation by using 4D-LSM.
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Received: 15 July 2021
Published: 20 September 2021
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