Research on Temperal-spatial Characteristics of Microseismic Activity in Hard Rock Tunnel at Baihetan Hydropower Station

DOI

10.2991/isaeece-17.2017.21How to use a DOI?

Keywords

underground cavern; microseismic monitoring; underground water; excavation rate; structural plane

Abstract

The underground cavern group of Baihetan hydropower station is characteristic with complex geological condition, large buried depth and high stress, the local failures of surrounding rock mass which often occurred frequently during the construction process. To study the mechanisms of failures result from the unloading effect of excavation, in situ microseismic monitoring system was established on the No.1 construction branch tunnel of spillway tunnel located on the left bank of Baihetan Hydropower Station, the relation between microseismic activity, geological condition and failures of surrounding rock is studied. The results show that:1) the region with abundant underground water was hard to gather stress and energy quickly in short time. 2) a low excavation rate weakened the risk of the failure of the surrounding rock of hard rock tunnel because of the unload effect of excavation. 3) the microseismic events were more active on north side of the tunnel and assembled on the north spandrel with opening structure plane.4) the risk of rockburst in the microseismic monitoring tunnel during the excavation is low. The research results provide reference for the optimization of the excavation and support and are meaningful for reducing the risk of the rock failures during the excavation.

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Huaji Liu
AU  - Bingrui Chen
AU  - Yaxun Xiao
PY  - 2017/03
DA  - 2017/03
TI  - Research on Temperal-spatial Characteristics of Microseismic Activity in Hard Rock Tunnel at Baihetan Hydropower Station
BT  - Proceedings of the 2017 2nd International Symposium on Advances in Electrical, Electronics and Computer Engineering (ISAEECE 2017)
PB  - Atlantis Press
SP  - 110
EP  - 116
SN  - 2352-5401
UR  - https://doi.org/10.2991/isaeece-17.2017.21
DO  - 10.2991/isaeece-17.2017.21
ID  - Liu2017/03
ER  -