STUDY ON ROCKBURST PREDICTION AND STABILITY EVALUATION FOR LARGE CAVERN GROUP UNDER HIGH GEOSTRESS CONDITIONS
Rockburst hazard has become a headache problem for safe excavation of the large caverns groups under high geostress conditions. In this paper, based on elasto-brittle-plastic constitutive model, a novel rockburst index, namely Local Energy Release Rate (LFRR), , is proposed. By using the new index, the intension of rockburst, the position and extent of brittle failure zone can be predicted quantitatively during rockmass excavations under high geostress conditions. Furthermore, a new comprehensive stability evaluative index including LERR rockburst index, damage degree index, rockfall risk index, failure status index, displacement index, is proposed for the stability comprehensive evaluation of surrounding rock masses under high geostress conditions. Analytic hierarchy process method based on experience of expert group is applied to achieve the comprehensive index. Finally, the comprehensive index is applied in stability analysis and nsk prediction for the excavating and supporting process of the large underground cavern groups of Shuangjiangkou Hydropower Station. The research results havebeen accepted as the important guidance for rational design and safe construction of the project.
GUO-SHAO SU XING-YI FU LIU-BIN YAN XIA-TING FENG QUAN JIANG
School of Civil and Architecture Engineering, Guangxi University Naning, 530004, P.R.China State Key laboratory of Geomechanics and Engineering, Institute of Rock and Soli Mechanics, Chinese
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
1205-1210
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）