摘要
在已建立的应变型岩爆五因素综合判据基础上,通过现场地质调查、统计分析和运用关系矩阵法,对所涉多个因素和指标进行归类合并,形成包括最大切向应力σθ,岩石抗拉强度Rt和岩体完整性指数K v等3个主要独立参数的经验拟合表达式rb t vP(θ/R)K=σ,用来表征岩爆趋势和强度(简称岩爆势Pr b)。对岩爆强度的无、弱、中和强等4个级别,提出3个分级界限值(1.7,3.3和9.7)。概算深度H=1 000和2 000 m(侧压系数λ=1.0)时Pr b结果分别为3.3和6.5,相当于弱岩爆上限值和中岩爆中间值。工程实例检验应用进一步表明该岩爆势指标的科学合理性。
On the basis of the 5-factors comprehensive method for rockburst classification, the authors put forward an empirical criterion for expressing rockburst potential and intensity. The field investigation and statistic analyses are carried out with help of interaction matrix approach. The proposed criterion is called rockburst potential Prb =（σθ/Rt）Kv, wheretrais maximum value of shear stress in sides walls; Rtis tensile strength; Kvis the intactness index of rock mass. Corresponding to the 4 grades as intense, moderate, weak and no rockburst, the 3 boundary values are presented as 1.7, 3.3 and 9.7. General calculation for depths ofH = 1 000 and 2 000 m（lateral coefficient 2, = 1.0）, the Prb values are 3.3 and 6.5, corresponding to upper limit of weak rockburst, and median of moderate rockburst, respectively. Case studies for application show the feasibility and reliability of the index Prb.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2013年第8期1520-1527,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB732001)
国家自然科学基金资助项目(40972198)
关键词
岩石力学
岩爆
地应力
岩爆分级
岩爆势
界限值
rock mechanics
rockburst
in-situstress
rockburstclassification
rockburstpotential
boundary values
