不同开挖方式下岩石高边坡损伤演化过程比较  

COMPARISON OF DAMAGE EVOLUTION PROCESS OF HIGH ROCK SLOPE EXCAVATED BY DIFFERENT METHODS

作　　者：胡英国[1,2] 卢文波[1,2] 陈明[1,2] 严鹏[1,2] 周创兵[1,2] 

机构地区：[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

出　　处：《岩石力学与工程学报》2013年第6期1176-1184,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家杰出青年科学基金项目(51125037);国家重点基础研究发展计划(973)项目(2011CB013501);中央高校基本科研业务费专项资金资助项目(2012206020205)

摘　　要：不同岩石高边坡开挖方式对保留岩体的损伤范围有重要影响。基于LS-DYNA二次开发的累积损伤仿真技术,对光面爆破和预裂爆破2种不同爆破方式下的开挖损伤全过程进行数值仿真。计算结果表明,光面爆破开挖方式下爆破损伤具有明显的累积特征,其中,主爆孔产生的累积损伤最严重,光面爆破次之,缓冲爆破最小。预裂开挖方案中,保留岩体几乎仅受到预裂孔的损伤作用,但预裂孔本身的损伤大于光爆孔。对比2种开挖方式下最终保留岩体的损伤分布特征:光面爆破开挖方式下,保留岩体中沿轮廓面分布较小范围的高程度损伤区以及中下部分布较大范围中等程度损伤区;预裂开挖方式下,保留岩体仅存在范围相对较大的沿轮廓面分布的高程度损伤区。It is important to study the damage evolution of high rock slope excavated by different methods,for the purpose of controlling possible damage of remaining rocks.Based on the secondary development of LS-DYNA,the overall process damage simulations of rock slope excavated by the smooth blasting and presplit blasting techniques are carried out in consideration of accumulated damage simulation technology.For the smooth blasting excavation method,the accumulated damage effect of product holes is the largest,followed by the smooth holes and the buffer holes.In the presplit blasting excavation,only the damage in remaining rock mass is induced,but it is bigger than that of smooth blasting.Comparing the damage distributions in remaining rock mass,there are two different kinds of damage zones in the remaining rock mass when using smooth blasting method.One is the zone induced by the smooth blasting itself but the degree of damage is high;and the other one is induced by accumulated effect of blasting in excavation zone,and the degree of damage is low.In the presplit blasting excavation,however,there is a bit higher degree of damage in remaining rock mass around the slope surface.

关 键 词：岩石力学 高边坡开挖 光面爆破 预裂爆破 累积损伤 

分 类 号：TU45[建筑科学—岩土工程]