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时间:2019-03-01
《高渗压条件下压剪岩石裂纹断裂损伤演化机制研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、网络出版时间:2012-06-1910:20网络出版地址:http://www.cnki.net/kcms/detail/42.1199.O3.20120619.1020.042.html第33卷第6期岩土力学Vol.33No.62012年6月RockandSoilMechanicsJun.2012文章编号:1000-7598(2012)06-1801-08高渗压条件下压剪岩石裂纹断裂损伤演化机制研究1,21231刘涛影,曹平,章立峰,赵延林,范祥(1.中南大学资源与安全工程学院,长沙410083;2.华东勘测设计研究院,杭州310006;3.湖南科技大学能源与安全工程学
2、院,湖南湘潭411201)摘要:探讨了高渗透压作用下压剪岩石裂纹的起裂规律及分支裂纹尖端应力强度因子的演变规律,建立了高渗压下裂隙岩体发生拉剪破坏的临界水压力值和初裂强度判据,分析了不同渗压作用下裂纹的扩展情况表明,渗透压的存在加剧了分支裂纹的扩展,高渗透压作用下分支裂纹扩展由稳定扩展变成不稳定扩展,并导致分支裂纹尖端岩桥剪切破坏,同时考虑分支裂纹的相互作用,建立了高渗透压作用下压剪岩石裂纹体岩桥剪切贯通的断裂破坏力学模型,最后依据裂隙岩体的损伤力学效应研究了岩体的初始损伤及损伤演化柔度张量,提出了高渗压下压剪岩石裂纹渐进破坏的损伤演化方程。该理论为定量研究高渗压下裂隙岩
3、体的失稳破坏提供了理论依据。关键词:高渗压;应力强度因子;裂纹扩展;断裂损伤准则;损伤演化方程中图分类号:TU45文献标识码:AStudyoffracturedamageevolutionmechanismofcompression-shearrockcracksunderhighseepagepressure1,21231LIUTao-ying,CAOPing,ZHANGLi-feng,ZHAOYan-lin,FANXiang(1.SchoolofResourcesandSafetyEngineering,CentralSouthUniversity,Changsha4
4、10083,China;2.HydroChinaHuadongEngineeringCorporation,Hangzhou310006,China;2.SchoolofEnergyandSafetyEngineering,HunanUniversityofScienceandTechnology,Xiangtan,Hunan411201,China)Abstract:Initialcrackinglawandevolutionlawofstressintensityfactoratthetipofthebranchcrackofcompression-shearfrac
5、turedrockunderhighseepagepressurearediscussed.Thecriticalwaterpressurevalueandtheinitialcrackingintensitycriterionofthefracturedrockmassunderhighseepagepressureareestablishedwhentension-shearfailureoccurs.Thecrackingcharacteristicsunderdifferentwaterpressuresindicatethattheexistenceofosmo
6、ticpressureaggravatesthegrowthofbranchcrack;andthebranchcrackpropagationunderhighosmoticpressurewillconventfromstableexpansiontounstableexpansionandcausetheshearfailureofthecragbridgeatthebranchcracktip;simultaneouslythebranchcrackinteractionisconsidered,thecragbridgescuttingpenetrationd
7、amagemechanicalmodelofthecompression-shearrockunderthehighseepagepressureisestablished.Finally,theflexibilitytensoroftherockmassinitialdamageanditsdamageevolutionbasedondamagemechanicaleffectoffracturedrockarestudied.Thenadamageevolutionequationoffracturedrockunder
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