板裂体组合条件下岩爆倾向性分析_周辉

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1、第35卷增刊2岩土力学Vol.35Supp.22014年10月RockandSoilMechanicsOct.2014文章编号：1000－7598(2014)增2－0001－07板裂体组合条件下岩爆倾向性分析周辉，胡善超，卢景景，张传庆（中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室，武汉430071）摘要：针对已有突变理论仅对单块板裂岩体进行分析的局限性，提出将板裂化岩体作为整体进行研究，考虑了劈裂岩体间的水平应力，改进了突变理论模型在岩爆分析中的应用，并分别计算对比了单块岩板及板裂岩板组合在准静力及动力扰动两种条件下的岩爆倾向性。研究结果表明，准静

2、力条件下单块岩板突变特征值变化趋势平缓，而组合岩体由于等效抗弯刚度较大，急剧增大；准静力条件下岩板组合的岩爆深度明显大于单块岩板时，岩爆深度达到0.76m；随岩板厚度增加，突变特征值逐渐增大，不再满足岩爆的充分条件，施加竖向扰动应力即可重新满足突变条件，所需外界扰动应力由几兆帕增大至几十兆帕。关键词：岩爆；单块岩板；组合岩板；突变；准静力；动力扰动中图分类号：TU751文献标识码：AAnalysisofrockburstpronenessunderconditionofcombiningspallingZHOUHui,HUShan-chao,LUJing-

3、jing,ZHANGChuan-qing(StateKeyLaboratoryofGeomechanicsandGeotechnicalEngineering,InstituteofRockandSoilMechanics,ChineseAcademyofSciences,Wuhan430071,China)Abstract:Inlightofthelimitationofanalyzingthesinglespallingrockplatebytheexistingcatastrophetheory,studyingthespallingrockplatesa

4、sawholeisputforward;thecatastrophetheoryappliedtotherockburstanalysisisimproved,consideringthehorizontalstressbetweenthesplittingrockplates.Basedonthis,therockburstpronenessofsinglerockplateandcombinedspallingrockplatesarecalculatedandcomparedrespectivelyundertheconditionsofquasi-sta

5、ticanddynamicdisturbance.Theresultsshowthat:undertheconditionofquasi-static,theeigenvalueΔofsinglerockplatechangesgentlywhiletheeigenvalueΔofcombinedspallingrockplatesincreasesrapidlybecauseofthelargeequivalentflexuralrigidity;therockburstdepthofcombinedrockplatesisobviouslylargertha

6、nthatofsinglerockplate;andthedepthreaches0.76m.Asthethicknessofrockplateincreases,eigenvalueΔgrowsupgraduallyandthesufficientconditionofrockburstinnolongerfulfilled.However,thecatastropheconditioncanbefulfilledagainifexternalverticaldisturbingstressisappliedontherockplatesandtheexter

7、nalstressneededincreasesfromseveralMPatotensofMPa.Keywords:rockburst;singlerockplate;combinedrockplates;catastrophe;quasi-static;dynamicdisturbance朱维申等[3]针对高地应力下工程实际，认为洞室开1引言挖使洞壁岩体产生劈裂破坏，易产生岩爆等剧烈变岩爆是对岩石工程具有重大威胁的动力灾害，形破坏。大量的岩爆案例也表明，围岩板裂化及其可以造成人员伤亡和重大经济损失。近年来许多专特征与岩爆强度和发生时间之间具有显著的相关关系[

8、4－6]家学者对岩爆分类