NUMERICAL SIMULATION FOR EXCAVATION BLASTING DYNAMIC DAMAGE OF ROCK HIGH SLOPE
HU Yingguo1，2，LU Wenbo1，2，JIN Xuhao1，2，CHEN Ming1，2，YAN Peng1，2
(1. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，Hubei 430072，China；2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering，Ministry of Education，Wuhan University，
Wuhan，Hubei 430072，China)
Abstract：It is important to realize the numerical simulation of the excavation blasting damage zone of high slope for the damage control of remaining rock. Based on the expression method of tensile damage by classical blasting damage models，the expression method of compression damage were introduced；and a modified method to determine the elastic physical parameters was put forward. Then，a new tensile-compression damage model was constructed. The established mathematical process of the model was derived in detail. The new model was programmed and linked to the computer code LS-DYNA through the user subroutine interface to realize calculation and test of the model. The damage effect in remaining rock of blasting excavation for Xiluodu down high slope of berm at elevation 640 m was simulated by the tensile-compression damage model. By the measurement of damage zone with acoustic detection，the effectiveness of the model was tested. At the same time，several common blasting damage models were used to make comparing calculation. The results show that the calculated values of the tensile-compression damage model agree well with the measurement of damage zone，and the proposed model?s accuracy is more precise than common blasting damage models.
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2012, Vol. 31 
