摘要
以典型硬岩—N～J水电站TBM引水隧洞砂岩为研究对象,建立基于能量耗散的硬脆性岩石损伤模型,并基于能量原理进行岩爆风险评判,主要结论如下:①从能量的观点和工程应用的角度出发,定量跟踪分析了岩爆孕育过程中的能量积聚情况,综合脆性指数和能量判据,提出基于能量原理的修正岩爆判别指标Prb.②应力强度比指标、能量指标和修正能量指标在掌子面在监测断面前后1倍洞径范围均剧烈变化,有发生强烈～极强岩爆的可能;与最大主应力垂直方向上,修正岩爆能量指标与原能量判据类似,相应的岩爆爆坑位置与另外两个判据差别不大,但岩爆范围预判更为准确;与最大主应力平行方向上,原应力判据判别为无岩爆,原能量判据则判别为中等岩爆,而修正判据判别为弱岩爆,与原应力、能量判据相比更符合现场实际情况.
Abstract
A modified energy criterion of the rock burst is proposed,by accounting for the brittleness index and the rock burst energy criteria comprehensively.The energy accumulation in the rock burst incubation process was tracked and analyzed quanti-tatively,and the intensity and the position of the rock burst in the excavation process of the underground engineering under the high stress were predicted reasonably based on the numerical simulations.The evolution of the rock burst incubation was ex-plored.The rationality and effectiveness of the modified energy criterion were verified by comparing the original prediction in-dex applied to the typical rock burst case.
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