【作者】 李新平； 张成良； 陈先仿； 李友华； 郭运华； 代翼飞；

【Author】 LI Xin-ping, ZHANG Cheng-liang, CHEN Xian-fang, LIYou-hua, GUOYun-hua, DAI Yi-fei (Institute of Architecture and Civil Engineering, Wuhan University of Technology, Wuhan 430070, China; China Gezhouba Group Corporation, Yichang 443002, China)

【机构】 武汉理工大学土木工程与建筑学院； 中国葛洲坝集团公司；

【摘要】 溪洛渡水电站右岸平行开挖3条大断面近距离的导流洞,形成了多个工作面平行和交叉作业,致使爆破开挖干扰大,安全问题突出。通过对复杂地下导流洞群爆破振动现场试验,研究了导流洞群爆破地震波在开挖主洞和邻近导流洞的传播规律。研究结果显示在爆破作业条件相同的情况下,在其中一条导流洞进行爆破开挖时,其洞内爆破质点振动速度传播规律与与之相邻导流洞的振动速度传播规律存在较大差别,相邻导流洞内的爆破质点振动速度传播具有放大效应,且距爆破点近的内侧壁比外侧壁的放大效应在爆源近场弱,远场强。这为复杂地下洞室群爆破施工的围岩稳定性和施工、支护的设计和安全性提供指导。更多还原

【Abstract】 During the construction of Xiluodu hydroelectric station, three parallel training tunnels with great height and span shape are excavated in the right bank, and those tunnels are close with each other. It is inevitable for many work faces to operate at the same time. Thus, the important problem of safety is presented by blasting interference and complicated constructing conditions. Based on maintaining stabilization of rock mass and reducing the cost of support, in-situ experiments of blasting vibration are carried out in the groups of tunnels. According to test data, the rules of transmission of blasting vibration wave are studied in the excavating own and adjacent tunnel. The results show that there are some differences in the rules of transmission of blasting vibration between own and adjacent tunnels when excavating own tunnel, in which the vibrating velocities of particles in the adjacent tunnel hold magnifying effect. Moreover, the velocity magnifying effects between inside and outside walls of the adjacent tunnel are different, and the velocity magnifying effect of inside wall is weaker in the near zone and stronger in far zone compared with the outside wall. The studying results offer the guidance to the construction and design of complicated groups of tunnels and will be useful for the similar projects.更多还原