OBSERVATION AND ANALYSIS OF SPLITTING FAILURE ZONES IN BRITTLE SURROUNDING ROCK UNDER HIGH GEOSTRESS
The Pubugou underground powerhouse is approximately 400 m below the ground surface. During excavation, a number of vertical splitting cracks appeared in the high wall of the busbar chamber. There are similar phenomena in Longtan, Ertan, Laxiwa as well as other underground powerhouses. In order to investigate the numbers and distributions of these cracks, Borehole Television (BTV) observations, C-1 electrical resistivity tester and the developed self-made borehole probe were earned out in the four boreholes at regular intervals throughout testing, the distribution rules of the vertical splitting cracks and the disintegrated zones of surrounding rock masses can be obtained. The results indicate that the special geometrical position of the busbar chamber in the underground cavern group, the complicated geological conditions and the excavation method result in this phenomenon. Meanwhile, it can be observed that the deformation of the high wall consists of opening displacement and continuous displacement.
QIAN-BING ZHANG WEI-SHEN ZHU LIN-FENG SUN
Geotechnical & Structural Engineering Research Center.Shandong University Jinan, 250061,P.R.China Geotechnical & Structural Engineering Research Center.Shandong University Jinan, 250061.P.R.China Fuzhou Investigation and Surveying Institute Fuzhou, 350000, P.R.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
101-106
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）