EDZ Assessment for Underground Cavern by Acoustic Wave Metgod
Xu Guangli
Dong Jiaxing
Li Zhipeng
Song Shengwu
Zhang Shishu
Wang Jinsheng
Abstract：Excavation Damaged Zone (EDZ)assessment is important for the design,execution and operation of modern underground engineering.However,it is very difficult to determine EDZ because of the complexity of lithology,geostress,excavation method,cav-ern size and shape,etc..Based on its definition,EDZ is subdivided into excavation highly damaged zone (EHDZ),excavation slightly damaged zone (ESDZ)and basically undamaged zone in this paper.Acoustic wave velocity method is suggested to determine EDZ.The acoustic wave curves are classified into typeⅠ,typeⅡand typeⅢ.EHDZ and ESDZ can be qualitatively determined by characteristic points of acoustic wave curves.A damage factor D calculated by the acoustic wave velocities is adapted to quantitatively assess EDZ.It is found that the comprehensive method and index provide us a good assessment of EDZ for underground caverns.
Keywords：underground cavernExcavation Damaged Zoneacoustic wave methoddamage factorgeology engineering
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1599-1606 )