岩质高边坡卸荷带形成及其工程性状研究
黄润秋① 林 峰① 陈德基② 王军怀②
(①成都理工学院工程地质研究所 成都 610059)(②长江水利委员会综合勘测局 武汉 430010)
Ξ
摘 要 首先针对边坡开挖或河谷下切的卸荷过程,讨论了边坡应力场的分布,提出了边坡二次应力的“驼峰应力分布”规律。在此基础上,分析了伴随边坡二次应力场的形成,岩质高边坡卸荷带的形成机理。进一步,结合三峡船闸高边坡的开挖和监测实践,讨论了卸荷带的工程地质意义及其力学性状表现。最后,利用本文的基本观点,对三峡船闸高边坡卸荷带进行了合理的数值模拟研究。关键词 高边坡 卸荷带 工程性状
中图分类号:TU642121TU41314 文献标识码:A
FORMATIONMECHANISMOFUNLOADINGFRACTUREZONEOFHIGHSLOPESANDITSENGINEERINGBEHAVIORS
HUANGRunqiu① LINFeng① CHENDeji② WANGJunhuai②
(①ChengduUniversityofTechnology,Chengdu 610059)
(②IntergratedSurveyBureauofChangjiangWaterConservancyCommittee,Wuhan 430010)
Abstract Theunloadingfracturezoneofhighrockslopeisverysignificantinrockslopeengineering.Inthispaper,firstly,thebasicregularitiesofsecondarystressdistributionresultedfromslopeexcavationandriverdur2ingcuttingarestudied,andthenageneralmodelforformationmechanismofunloadingfracturezoneissuggest2ed.Itrevealsthattheunloadingfracturecanbediscriminatedintotwobasictypes,i.e.tensilefracturingandshearrelaxing.Moreover,theengineeringbehaviorsoftheunloadingfracturezoneanditsmechanicalsignifi2cancearediscussed.Onthisbasis,weproposeanumericalsimulationapproachtotheunloadingfracturezoneinslopeexcavation.Finally,asatypicalexample,thedistributionofunloadingfracturezoneofhighslopeatThree-Gorgesshiplockisfiguredoutanditsprogressivedevelopmentprocessissimulatednumerically.Keywords Highrockslope,Unloadingfracturezone,Engineeringbehaviors.
Ξ收稿日期:2000-10-15;收到修改稿日期:2000-12-20.
基金项目:国家杰出青年科学基金(批准号:49525204)持续资助项目支持1
第一作者简介:黄润秋(1963-),男,教授,博士,博士生导师,从事工程地质,环境地质工作1Email:hrq@cdit.edu.cn
© 1994-2007 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net
228JournalofEngineeringGeology
工程地质学报 2001 9(3)
© 1994-2007 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net
黄润秋等:岩质高边坡卸荷带形成及其工程性状研究229
© 1994-2007 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net
230JournalofEngineeringGeology
工程地质学报 2001 9(3)
© 1994-2007 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net
黄润秋等:岩质高边坡卸荷带形成及其工程性状研究231
© 1994-2007 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net
232JournalofEngineeringGeology
工程地质学报 2001 9(3)
© 1994-2007 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net
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