Study on the low velocity zone in surface layer of dam foundation and its engineering significations

摘要：

There usually distributes a zone with lower acoustic wave velocity in surface layer of dam foundation after excavation. According to requirements which the dam foundation have to meet, the definition of low velocity zone is put forward. Then the relationships of the depth of low velocity zone with the lithology, the degree of weathering, the rock mass quality of dam foundation are analyzed in detail. A compositive map of low velocity zone in surface layer of dam is drawn up. And then the typical characteristics and the engineering significations of low velocity zone in the different parts of dam foundation are discussed detailed. Based on the analysis results the scope and depth of surface layer of dam foundation which need to be treated is suggested.

关键词： dam foundation surface layer low velocity zone acoustic wave

作者: LI Pan-feng YANG Jian-hong NIE De-xin

作者单位: HydroChina Chengdu engineering cooperation Chengdu,610072 Chengdu University of Technology Chengdu,6 HydroChina Chengdu engineering cooperation Chengdu,610072 Chengdu University of Technology Chengdu,610059

会议类型: 国际会议

会议名称: International Symposium and The 7th Asian Regional Conference of IAEG(国际工程地质与环境协会年会暨第七届亚洲工程地质会议)

会议地点: 成都

会议语种:英文

页码: 548-551

在线出版日期: 2009-09-09（万方平台首次上网日期，不代表论文的发表时间）