爆炸应力波在洞室围岩中的分布及洞库稳定性研究  

Distribution of an Explosive Stress Wave in Surrounding Rock and the Relevant Stability of an Underground Cavern

作　　者：沈俊[1] 张向阳[1] 陈安敏[1] 徐景茂[1] 孔福利[1] 

机构地区：[1]总参工程兵科研三所,洛阳471023

出　　处：《现代隧道技术》2014年第5期55-60,共6页Modern Tunnelling Technology

摘　　要：文章采用模型试验和数值计算相结合的方法,对爆破应力波在下部已有洞库围岩内的传播及洞室的安全稳定性进行了研究,得到了爆炸波在洞室围岩体内的分布规律及拱顶的位移曲线。结果表明:压力峰值随着距爆点距离的增大而逐渐减小,通过爆心竖直测量线上的垂直压力峰值大于通过洞室形心水平线上对应位置处的压力峰值,水平测量线上测点的垂直压力峰值基本上大于水平压力峰值;正拱顶部位爆炸压力峰值小于衬砌材料的抗压强度,且拱顶没有产生不可恢复的永久位移,洞室是安全稳定的;交通隧道爆破施工时,应重点监测其下方洞室正拱顶及拱脚与侧墙顶部交接部位衬砌的动态反应。Combined with model testing and numerical calculations,the propagation of an explosive stress wave in the surrounding rock of a proposed tunnel and the stability of an existing underground cavern were researched,and the relevant wave distribution law and displacement curve of the vault were obtained.The results show that：（1） the pressure peak decreases with an increase of distance from the explosion point;（2） the vertical pressure peak on the vertical measuring line through the explosion center is greater than the horizontal pressure peak in the same position through the centroid of the cavern,and the vertical pressure peak on the horizontal measuring line is greater than that of the horizontal pressure peak;（3） the pressure peak on the vault is less than the compressive strength of the lining,and moreover,the cavern is safe and stable without the unrecoverable displacement of the vault; and（4） attention should be focused on the dynamic response of the lining at the intersection of the cavern vault,arch foot,and sidewall crown during the blasting of a transportation tunnel.

关 键 词：已建洞室 爆破动载 模型试验 数值计算 稳定性 

分 类 号：TU452[建筑科学—岩土工程]