隧道掌子面积水对瑞利波勘探影响研究  

Influence of seeper surrounding tunnel excavating face on Rayleigh wave exploration

作　　者：刘毅[1] 陈伯辉[1] 沈斐敏[1] 

机构地区：[1]福州大学环境与资源学院,福建福州350108

出　　处：《福建工程学院学报》2012年第1期21-24,共4页Journal of Fujian University of Technology

基　　金：福建省科技计划资助项目(2007Y0023)

摘　　要：在使用瑞利波对隧道进行地质超前预报时,经常会遇到掌子面积水的情况。文章从分析瑞利波的波动方程入手,将掌子面积水假定为自由面上覆盖一层非弹性覆盖层,以此为基础推导出积水对瑞利波传播的影响方程,认为掌子面积水情况下,受到垂直应力的作用瑞利波发生频散,同时岩体质子的振动也会由于外界水体的存在而受到黏滞力的影响,瑞利波周期变大、频率变小。但是经过深入研究和结合工程实例,发现这种影响仅仅停留在积水层表面,对整个工程地质超前预报没有明显影响。Seeper surrounding tunnel excavating face often occurs when Rayleigh wave is adopted in roadbed detection. Taking the basic theoretical equation, we assume seeper surrounding tunnel ex- cavating face as a layer of inelastic overburdened cover on the free-surface, and derive an equation of the seeper＇s influence on the propagation of Rayleigh wave. It is found that under the seeper, the Rayleigh wave is influenced by the vertical stress and may disperse. At the same time, the vibration of the rock is also influenced by the viscous drag force. As a result, the Rayleigh wave＇s cycle ex- tends with lower frequency. Through the analysis of the basic theoretical equation and engineering examples, it is indicated that the phenomenon only occurs on the surface of seeper, and has little effect on the pre-deteeting of tunnel.

关 键 词：瞬态瑞利波 超前预报 隧道 积水 

分 类 号：TU195.1[建筑科学—建筑理论]