Paper Title:
Damage Evolution of Rock and Acoustic Emission Study about Deep Diversion Tunnel in the Excavation Process
  Abstract

In order to reveal the scale, location and damage mechanism of depth underground tunnel this was excavated. Experimental study in the project scenes where more than 2500 meters underground, makes use of the acoustic emission technology, and monitor the whole process of the Jin ping 2# experiment hole excavated, researches combining the acoustic emission and the surrounding rock damage evolution process. The results indicate that: The acoustic emission event and the energy parameter can reflect rock internal stress field change, according to above can determine the stable degree of rock mass; The emergence, development of rock burst and unstable rock produce mostly occurred in the place where surrounding rock stress was smaller or have been discharged when great depth underground tunnel was excavated, and its direction was along the direction of roadway excavation, from the part where rock stress was smaller develop to tunnel in wall; And main damage or cracking is developed in 7m range: 3m locations the most severe after free face. Relaxation and damage range of surrounding rock are 2m, 2~5m, and 5~12 m far from tunnel wall, Rock mass abscission is caused by the increasing of rock damage vibration amplitude, and the rock mass falls off is also an energy release’s process.

  Info
Periodical
Chapter
Chapter 1: Material Engineering and its Application
Edited by
Helen Zhang and David Jin
Pages
243-246
DOI
10.4028/www.scientific.net/AMR.366.243
Citation
Z. Q. Kang, Y. Yu, H. M. Wen, "Damage Evolution of Rock and Acoustic Emission Study about Deep Diversion Tunnel in the Excavation Process", Advanced Materials Research, Vol. 366, pp. 243-246, 2012
Online since
October 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Jae Young Nam, S.H. Choi, Jae Boong Choi, Young Jin Kim
Abstract:Even though an excavation is not under the direct control of the utility operators, it is the main cause of third-party damage on the...
123
Authors: Shan Chai, Li Jun Li, Xian Yue Gang, Zhen Hua
Abstract:The method of measuring infrasound wave in the process of low carbon steel damage is presented. The test program is designed, which applies...
698
Authors: Yong Jie Yang, De Chao Wang, Kai Wang, Nan Nan Zhao
Abstract:Analysis of rock acoustic emission characteristics in complete stress-strain process under uniaxial compression shows that the evolution...
2239
Authors: Qi Wang, Yin Sheng Chen, Kai Song
Abstract:The appearance and growth of the microcracks in the structure is an important factor that influences the structure safety and its service...
432
Authors: Gang Wu, De Yong Wang
Chapter 1: Civil Engineering
Abstract:The mechanical properties and acoustic emission evolution process of limestone under the action of high temperature load were investigated by...
23