物探与化探2016，Vol.40Issue(1)：214-219,6.DOI:10.11720/wtyht.2016.1.38
拟VSP与克希霍夫偏移法在隧道超前预报中的应用
The application of Pseudo VSP method and Kirchhoff migration to the tunnel advanced geological prediction
摘要
Abstract
The technology of advanced geological prediction can detect the geological structure of the tunnel face and predict the ad-verse geological conditions so as to ensure the efficiency and safety of the construction. This paper introduces the theory of Pseudo VSP and Kirchhoff migration imaging respectively, and argues that Pseudo VSP, which takes advantage of the intersection of reflection and P-wave arrival time to predict the position of reflection interface ahead, is suitable for the situation that the sources or the receivers are designed on a straight line; however, Kirchhoff migration method can be used in any observation system. This paper is based on the principle of Kirchhoff migration imaging and Pseudo VSP. Taking the Yakou tunnel as an example, the authors compared the imaging results between the two methods through a series of pretreatments,such as time-shift correcting, filtering, wave field separating, and ra-don transform. The results show that Pseudo VSP can predict the position of construction accurately, but it cannot predict the structural strike. Kirchhoff migration imaging which gets the information of migration velocity by velocity scan method is on the basis of reflected wave energy to determine the reflection interface, and the intersection of reflection interface and tunnel is the position of construction. Combination of Pseudo VSP and Kirchhoff migration imaging can predict the structural strike and position more precisely.关键词
超前预报/波场分离/拉东变换/拟VSP方法/克希霍夫偏移Key words
advanced geological prediction/wavefield separation/radon transform/Pseudo VSP/Kirchhoff migration imaging分类
天文与地球科学引用本文复制引用
查欣洁,王伟,高星..拟VSP与克希霍夫偏移法在隧道超前预报中的应用[J].物探与化探,2016,40(1):214-219,6.基金项目
国家自然科学基金项目(41374061、41574036、41130419) （41374061、41574036、41130419）
