向家坝水电站岩锚梁爆破开挖的试验研究  

Experimental Study on Rock Anchor Beam Blasting Excavation at Xiangjiaba Hydropower Station

作　　者：刘晓阳 何涛 饶平[3] 

机构地区：[1]中国水利水电建设工程咨询西北公司,陕西西安710075 [2]长江岩土工程总公司(武汉),湖北武汉430010 [3]中国水利水电第七工程局有限公司,四川成都610081

出　　处：《红水河》2011年第2期39-42,共4页Hongshui River

摘　　要：岩锚梁的开挖是向家坝地下厂房开挖施工过程中最困难也是最重要的一部分。夹层、层面和节理裂隙的存在对岩锚梁岩台的开挖爆破质量提出很高的要求。根据向家坝地下洞室围岩的特点,进行爆破试验设计时,将围岩按Ⅱ、Ⅲ类和Ⅳ、Ⅴ类选取两段,每段再分别细分为3组,每组的钻孔参数相同,装药参数赋予不同值,分别进行爆破试验。试验结果显示,在Ⅳ、Ⅴ类围岩的爆破试验中,第2组试验参数效果最好,而在Ⅱ、Ⅲ类围岩爆破试验中,第1和第2组试验得到的效果均较好。经声波检测,两段试验区的围岩因爆破作用破坏甚微或未破坏,符合规范的要求。两组爆破试验均取得了比较满意的测试结果,为后期的岩锚梁开挖提供了重要的设计参数。The excavation of rock anchor beam is the most difficult and important part of underground powerhouse excavation at Xiangjiaba Hydropower Station.High requirement is put on rock bench with rock anchor beam for there are interlayer,bedding plane and joint fissure.In order to carry out blasting test,two areas of surrounding rock in Class II III as well as Class IV V respectively are selected.Each area is furthered divided into three groups.Each group has the same drilling parameters and different charge parameters.Test results find that the test on the second group of Class IV V surrounding rock and on the first and the second groups of Class II III surrounding rock gets the best effect.Sound wave detection finds that the surrounding rock of the two test areas is hardly or not damaged in blast and meets standards.Blasting test at the two areas gets satisfactory results and provides important design parameters for the following rock anchor beam excavation.

关 键 词：岩锚梁 爆破试验 声波检测 向家坝水电站 

分 类 号：TB41[一般工业技术]