Test Study of Rockburst Proneness on Galongla Tunnel of Zhamo Highway in Tibet, China
详细信息
- 责任者：Jin Xiaoguang (School of Civil Engineering ; Chongqing 400045 ; China) ; Wang Yan
- 刊名：Journal of Mountain Research
- 出版年：2013
- 卷期：31(1)
- 页码：p.114-119
- 图表：6 illus., 1 table, 11 refs.
- issnNo：ISSN1008-2786
- isbnNo：CN51-1516/P
摘要
Rockburst proneness is one of main geologic disasters in the mountain construction of hard rock tunnel with high geostress,rockburst proneness analysis is the main method of studying and predicting rockburst.Galongla Tunnel of Zhamo Highway(from Zhamu to Motuo) in Tibet,which buried deeply with high geostress and whose main lithology is granite,has the high possibility of rockburst.Based on the Tibet Zhamo Road Galongla Tunnel Engineering,drilling the core specimens from Galongla tunnel,rock uniaxial compress experiments,rock uniaxial compress loading and unloading experiments and Kaiser effect acoustic emission experiments were done,carrying out the studying of rockburst proneness.The test results shows that the impact performance indicators WCF(the ratio between energy accumulating before peak load and energy dissipation after it) are more than 3.0 all,most elastic deformation energy index WET(the proportion of the area under the unloading curve to the area between the loading and unloading curve in the pre-peak of the complete stress-strain curve) are more than 2.5,the rock has strong rockbust proneness.Characteristics of AE accumulation of hit number-time curve belongs to class III,AE counts increase suddenly when the stress is near the peak,the rock has a sudden and heavily destroy quickly,whose rockburst proneness are strong.The tunnel construction practice shows that there are rockburst happened in research section,but because of enough groundwater,it is designated as weak rockburst.The study of rockburst proneness provides information for safe construction and optimizing design of Galongla Tunnel,and provides reference to other similar projects in high geo-stress areas.