@基于HoekBrown准则的隧洞围岩变形研究
时间:2025-04-20
时间:2025-04-20
第32卷第1期2011年1月
岩
土
力学
、,rol32
Jan.
NO.1201l
RockandSoilMechanics
文章编号l1000--7598(2011)Ol—0063一07
基于Hoek.Brown准则的隧洞围岩变形研究
温森1,杨圣奇2
(1.河南大学土木建筑学院,河南开封475004:2.中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008)
摘要:由于在许多实际条件下,比如节理岩体中,线性的M.C准则不太适用,非线性的Hock-Brown比较适用,因此,可以尝试使用这一非线性屈服准则对洞室变形进行研究。研究隧洞变形时,将围岩分为弹性区、应变软化区、塑性流动区。采用Hoek-Brown准则和非关联流动法则对洞室变形进行了理论推导:软化区域围岩参数随着塑性变形增加而变化,解析法难以求得应力,采用龙格一库塔方法进行数值计算,求解得到塑性软化区和流动区半径,并最终求得洞室变形。通过算例计算表明,在不考虑软化区和流动区时,方法和Carranza-Torres计算结果相差甚小;随着原岩应力的增加,膨胀角对洞室变形的影响增大。
关键词l隧洞:Hoek-Brown准则;应变软化区;塑性流动区;龙格一库塔方法中图分类号:TD
853.34
文献标识码l
A
Studyofdeformationsofsurroundingrockoftunnelbased
Hoek-Browncriterion
WEN
(1.School
ofCivilEnglneering
UndergroundEngineering,China
on
Senl,YANGSheng—qi2
andDc印
andArchitecture,HenanUniversity,Kaifeng,Henan475004,China;2.StateKeyLaboratoryforGeomechanics
UniversityofMiningandTechnology,Xuzhou,Jiangsu221008,China)
Abstract:Inmanypracticalsituations,forinstance,injointedrockmass,linearM-Cyieldcriterionmay
to
not
be
justified
anda
nonlinearHoek-Brownyieldcriterionwouldbemoreappropriate,SOitisnecessarytoattempt
thecriterion.Thesurroundingderivation
on
calculate
deformationoftunnelby
rock
isdividedintothreezones:elasticzone,strainsofteningzoneandplasticflowzone.Theoretical
out
deformationiscarried
zone
are
byHock-Browncriterionandnon—associatedflowrule.Parametersofsurroundingrockin
zone,so
strainsoftening
variable
and
they
depend
Oil
the
plasticdeformationofthis
out
it’S
difficulttoderivetheanalytical
solutionforstressinthiszone.Runge—Kutta
zone
methodisusedtocarry
numericalcalculationandtheradiusesofstrainsoftening
and
plasticflow
zone
arecalculated.Finally,thedeformationsoftunnelarecalculated.Itisdemonstratedbyanexamplethat
zone
theresultscalculatedbythemethodinthispaperandCarranza-Torres’Smethodarealmostthesamewhenstrainsofteningplasticflow
zone
and
are
not
be
considered.Furthermore,itis
stress
demonstrated
bytheother
exampletha …… 此处隐藏:9712字,全部文档内容请下载后查看。喜欢就下载吧 ……
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