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岩石高边坡开挖爆破动力损伤的数值仿真

ISSN号：1000-6915
期刊名称：岩石力学与工程学报
时间：2012.11.15
页码：2204-2213
分类：TU45[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072, [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072
相关基金：国家杰出青年基金项目（51125037）; 国家重点基础发展计划（973）项目（2011CB076354）; 中央高校基本科研业务费专项资金资助项目（2012206020205）
相关项目：岩体开挖瞬态卸荷的作用机制及动力效应

关键词：岩石力学, 损伤区, 拉压损伤模型, 声波检测, 对比计算, rock mechanics, damage zone, tensile-compression damage model, acoustic detection, comparative calculation

中文摘要：

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。

英文摘要：

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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