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1、第32卷第2期土木建筑与环境工程Vol.32No.22010年04月JournalofCivil,Architectural&EnvironmentalEngineeringApr.2010深埋隧道空间结构体系可靠度分析李志华,孙秀丽,华渊(江南大学环境与土木工程学院,江苏无锡214122)摘要:现行规范对隧道同类围岩中某一点的塌方高度进行了统计,但未能考虑同类围岩长度范围内塌方高度的空间变异性,为此提出了围岩塌方高度空间等效方差增大函数σh(L)。同时运用cWeibull—Бοлοгин脆性破坏统计理论,求得隧道空间结构所用混凝土的等效抗压强度f
2、e;从而将同类围岩长度范围内的深埋隧道空间结构体系可靠度问题简化为平面问题。以金州隧道Ⅲ类围岩深埋段隧道空间结构为研究对象,分析了节理间距特征值、围岩塌方高度均方差上限,隧道长度等因素对其体系可靠度的影响。计算结果表明,节理间距特征值越大,可靠度指标越高;随着围岩塌方高度均方差上限及隧道长度的增长,可靠度指标逐渐减小,具有趋于稳定的趋势。关键词:深埋隧道;空间结构;体系可靠度;塌方;等效方差增大函数中图分类号:U451文献标志码:A文章编号:167424764(2010)0220040206ReliabilityAnalysisofSpaceStr
3、ucturalSysteminDeep2buriedTunnelLIZhi2hua,SUNXiu2li,HUAYuan(EnvironmentalandCivilEngineeringSchool,JiangnanUniversity,Wuxi214122,Jiangsu,P.R.China)Abstract:Heightofsimilarrockmasslandslidesinonetunnelsectionwasprocessedwiththestatisticalmethodintheexistingdesigncodes.However,t
4、hespatialvariabilitywithinthesimilarrockmasslengthwasnottakenintoaccount.Inordertoovercometheshortcomings,anequivalentdeviationincreasingfunctionofthespacerockmasslandslidesheightσh(L)wasputforward.AndtheWeibull2Бοлοгинstatisticaltheoryforbrittlematerialsfailurewasemployedtofi
5、ndtheequivalentcompressivestrengthoftunnelsecondaryliningwithdifferentconcretevolumes.Asaresult,theproblemofspacestructuralsystemreliabilityforthedeep2buriedtunnelcouldbesimplifiedasaplaneproblem.TakingtheclassⅢdeep2buriedrockmassinJinzhoutunnelasanexample,thecharacteristicval
6、uesofjointspacing,varianceupperlimitofrockmasslandslidesheightandthelengthofthetunneltoaffectthesystemreliabilitywereanalyzed.Anditwasshownthatthesystemreliabilityindexincreasedwiththeincreaseofcharacteristicvalues.Thesystemreliabilityindexdecreasedgraduallywiththeincreaseofva
7、rianceupperlimitofrockmasslandslidesheightandthelengthofthetunnel.However,thereliabilityindexwouldbetowardsastablevalueattheend.Keywords:deep2buriedtunnel;spacestructures;systemreliability;landslides;equivalentdeviationincreasingfunction隧道结构所处的地层条件复杂,二次衬砌材料方法比用安全系数法更加科学合理。中国《工
8、程结力学性能、几何尺寸、围岩力学参数及荷载等都是不构可靠度设计统一标准(GB50153-92)》第1.0.11确定的。评价
