岩石高边坡开挖爆破动力损伤的数值仿真

 实现高边坡爆破开挖损伤区的数值仿真对研究保留岩体的损伤控制有重要意义。基于采用经典爆破损伤模型表达拉伸损伤的方法，引入对压缩损伤的考虑，同时，修正岩体宏观弹性参数的确定方法，建立自定义拉压损伤定量计算模型，详细推导其建立的数学过程，并采用LS-DYNA用户自定义接口将其成功导入LS-DYNA。采用该模型对溪洛渡高边坡640 m高程马道下边坡保留岩体的爆破开挖损伤效应进行数值仿真，通过岩体声波测试得到的实测损伤区，验证模型的有效性。选取目前应用较为广泛的爆破损伤模型进行对比计算，计算结果表明：拉压损伤模型的计算值与损伤区实测结果有较好的一致性，且与常用的爆破损伤模型相比，拉压损伤模型的精确性略有提高。

NUMERICAL SIMULATION FOR EXCAVATION BLASTING DYNAMIC DAMAGE OF ROCK HIGH SLOPE

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.