建基面岩体表层低波速带分布特征及其成因  

The Distribution Characterization and the Genetic of Low Wave Zone on the Surface of Rock Mass of the Dam Foundation

作　　者：王双龙[1] 许模[1] 覃礼貌[2] 蔡斌[3] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]西南交通大学土木工程学院,四川成都610031 [3]中国水电顾问集团成都勘测设计研究院,四川成都610000

出　　处：《人民黄河》2012年第4期123-125,共3页Yellow River

摘　　要：坝基开挖后,表层岩体会产生松弛卸荷现象,引起表层岩体声波波速明显降低,在表层形成低波速带。某水电站坝基左岸表层低波速带空间分布特征分析结果表明:坝基岩体表层低波速带的空间分布呈层状,局部出现异常深度;坝基表层低波速带在空间上的分布状况与表层岩体浅表生时效变形、建基面地质构造等因素有关。After the dam base excavation,the surface rock mass begets relaxation and unloading phenomenon,causing the conspicuously slow down of rock mass sound wave,forming a region with low wave velocity.The analysis about space distribution characters of the left bank of a certain hydropower station dam base shows that low wave speed zone of the surface dam base rock mass are of layered distribution,and some local abnormal depth;space distribution features of the low wave speed zone of the dam base surface are related to factors like the dam foundation surface low velocity zone in the spatial distribution of surface rock and epigenetic time-effect deformation,and foundation surface geological structure of the surface rock mass,etc.

关 键 词：低波速带 应力释放 松弛卸荷 浅表生时效变形 地质构造 

分 类 号：TV223.1[水利工程—水工结构工程]