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时间:2019-05-11
《循环荷载作用下层状节理岩体锚固效果的物理模拟研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第23卷第10期岩石力学与工程学报23(10):1724~17292004年5月ChineseJournalofRockMechanicsandEngineeringMay,2004循环荷载作用下层状节理岩体锚固*效果的物理模拟研究康天合郑铜镖李焕群(太原理工大学采矿工艺研究所太原030024)摘要运用物理模拟方法,研究了在循环荷载作用下层状节理岩体非锚固与锚固模型的弹性模量E随岩体分层厚度h和块度a(岩块体积的立方根)的变化规律。试验的16个模型是层状和层状节理岩体非锚固与锚固模型各4个。得出的结论是:层状与层状节理岩体非锚固模型的E随h或a呈指数规律变化。层状与层状节
2、理岩体,在第1加载循环时E随h或a呈对数规律变化;在循环加载时E随h或a呈线性规律变化。在非锚固条件下,岩体发生由表及里的层裂破坏,而锚固使层裂破坏得到了有效控制,模型破裂后仍具有良好的整体承载性能。岩体的h和a越小,锚固效果越好。高应力条件下对层状与层状节理岩体的锚固必须强调各锚固件的强度和锚杆的预紧力。关键词岩石力学,层状节理岩体,锚-梁-网锚固,弹性模量,锚固效果,物理模拟分类号TU458文献标识码A文章编号1000-6915(2004)10-1724-06PHYSICALSIMULATIONONBOLTEDEFFECTOFLAYEREDANDJOINTEDROCK
3、MASSESUNDERCYCLICLOADKangTianhe,ZhengTongbiao,LiHuanqun(MiningInstitute,TaiyuanUniversityofTechnology,Taiyuan030024China)AbstractUsingphysicalsimulationmethod,thevarietylawsofelasticmodulusEwiththerock-layerthicknesshandthefragmentationdegreea,thecuberootofrockblockvolume,ofthelayeredandj
4、ointedrockmassesundercyclicloadwithandwithoutboltsupportarestudiedindetail.Thefournon-boltedmodelsandfourboltedmodelsoflayeredrockmasses,andfournon-boltedmodelsandfourboltedmodelsoflayeredandjointedrockmassesareadoptedfortesting.Thethicknessesoflayeredrockmassesare540,270,135and67.5mm,res
5、pectively.Thecorrespondingjointintervalsare540,450,385.7and337.5mm,respectively,inthelayeredandjointedrockmasses.Thefragmentationdegreesofthelayeredandjointedrockmassesare540,380,272and197mm,respectively.Itisshownfromthetestthat(1)thevarietylawofEwithhoraofnon-boltedmodelsinlayeredandjoin
6、tedrockmassesisofexponentialregularity,(2)thevarietylawofEwithhoraofboltedmodelsinlayeredandjointedrockmassesisoflogarithmregularityunderthefirstloading,andlinearoneundercyclicloadings,(3)undernon-boltedcondition,thelayeredfailuretakesplaceinlayeredandjointedrockmassesand(4)underboltedcon
7、dition,thelayeredfailureiseffectivelycontrolled,sothatthebrokenmodelsarestillofgoodloading-bearingcapacity.Keywordsrockmechanics,layeredandjointedrockmasses,bolt-beam-netanchor,elasticmodulus,boltedeffect,physicalsimulation2003年10月26日收到初稿,2003年12月29日收到修改稿。*教育部高等学校骨干
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