基于孤石的弹性波波速和电磁波衰减特性层析成像技术对比研究  

Comparison study on tomography technique based on elastic wave velocity and electromagnetic wave attenuation properties of spherical weathered granite

作　　者：李红立[1] 潘冬明[1] 张华[2] 胡明顺[1] 

机构地区：[1]中国矿业大学,江苏徐州221008 [2]广州地铁设计研究院有限公司,广州510010

出　　处：《工程勘察》2016年第10期72-78,共7页Geotechnical Investigation & Surveying

摘　　要：在工程建设过程中常遇到花岗岩球状风化体不良地质问题,城市轨道交通建设尤其明显,严重影响着盾构法隧道施工的效率和安全,因此,发展孤石探测技术意义重大,但目前仍是一项技术难题。本文以孤石探测技术为研究目的,提出从孤石的波速特征和对电磁波的衰减特性进行综合探测,文中详细论述了数据处理的正、反演理论,并重点介绍了波速层析和衰减层析两种算法的高度一致性,通过实例分析说明两种探测技术均对孤石探测存在成效,研究成果说明综合利用两种物性条件进行孤石探测可增加探测精度,成果相互补充,相互印证,最后以本研究为基础展望了基于波速和衰减系数的联合反演技术。The light weathered granite named remaining stone locating in fully or strongly weathered granite is the harmful geological problem encountered during construction, especially in subway construction. It severely affects the efficiency and safety in the construction of shield-driven tunnel.Therefore,it is great significance to develop the remaining stone detection technique,and it is a technical problem still yet. The aim of this paper is to study the technique of detect the remaining stone,and the integrative detecting method is put forward based on the characters of the wave velocity and attenuation coefficient. The principles of the forward modeling and the inversion are introduced in detail,and the high consistency of the algorithm between velocity tomography and attenuation tomography are mainly introduced. The practice results show that both the detection techniques are effective for the remaining stone detecting. The study shows that combining the two methods could increase the detection accuracy,and the detecting results complement each other and support each other. Finally,the joint inversion technique is prospected based on the study.

关 键 词：弹性波 电磁波 层析成像 综合探测 孤石 

分 类 号：P631[天文地球—地质矿产勘探]