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时间:2018-04-23
《阿海水电站坝前堆积体稳定性研究》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、176中国农村水利水电·2015年第5期文章编号:1007-2284(2015)05-0176-04阿海水电站坝前堆积体稳定性研究鲁占荣1,侯明勋1,吴振君2(1.上海交通大学船舶海洋与建筑工程学院,上海200240;2.中国科学院武汉岩土力学研究所,武汉430071)摘要:采用极限平衡法对阿海水电站坝前堆积体边坡的稳定性问题进行了系统的研究。针对应用严格Janbu法迭代求解安全系数时存在收敛性不佳的问题,采用B-样条插值函数对条间力矩进行了拟合,从而保证了条间力矩一阶导数连续可导,改善了严格Janbu法安全系数计算的收敛性。坝前堆积体稳定性计算结果表明,在自然工况
2、下,边坡是稳定的;在水电站正常蓄水工况下,其抗滑稳定安全系数在0.865~1.167之间,说明堆积体边坡存在局部失稳风险。对坝前堆积体进行削坡减载处置后,其稳定安全系数可以满足运行期边坡稳定安全控制标准。此外,通过参数敏感性分析指出,安全系数对堆积体冲积层饱和状态的内摩擦角较为敏感。关键词:堆积体;边坡稳定性;极限平衡法;严格Janbu法中图分类号:TV642.3文献标识码:ATheStabilityAnalysisoftheDepositBodyinFrontofA'HaiHydropowerStation1,HOUMing-xun1,WUZhen-jun2LUZ
3、han-rong(1.SchoolofNavalArchitecture,Ocean&CivilEngineering,ShanghaiJiaoTongUniversity,Shanghai200240,China;2.InstituteofRockandSoilMechanicsChineseAcademyofSciences,Wuhan430071,China)Abstract:FortheslopestabilityproblemofthedepositbodyinfrontofA'HaiHydropowerStation,thelimitequilibriu
4、mmethodsareusedtoobtainthefactorsofsafetyofslopestabilityagainstsliding,anditsstabilityisalsoanalyzed.RigorousJanbumethodispoorinitsconvergenceintheprocessofiterativelycalculatingfactorsofsafety.Inthispaper,theB-splineinterpolationfunctionisusedtofittheinter-slicemoment,whichmakessuret
5、hattheinter-slicemomentfunctioniscontinuousinthefirst-orderderivative.Thusthenon-convergenceproblemsofsafetyfactorcalculatedbytherigorousJanbumethodaregreatlyimproved.Theobtainedresultsshowthatthedepositbodyisstableundernaturalconditions.Undernormalhydropowerreservoirconditions,thefact
6、orofsafetyforslopestabilityofthedepositbodyagainstslidingisfrom0.865to1.167.Therefore,theadviceofslopecuttingisproposed.Aftertheex-cavationdisposal,stabilitysafetyfactorsofthedepositbodymeetthecontrolstandardsinoperationperiodofA'HaiHydropowerStation.Inaddition,theparametersensitivitya
7、nalysisshowsthatthesafetyfactorismoresensitivetotheinternalfrictionangleofsaturatedalluvium.Keywords:depositbody;slopestability;limitequilibriummethods;rigorousJanbumethod35°~45°,两岸冲沟发育,坝址河谷为“V”型。坝址区地震基本0引言烈度为Ⅷ度,工程区域地质构造背景复杂,分布在库区的边阿海水电站位于云南省丽江市玉龙县(右岸)与宁蒗县(左(滑)坡体、堆积体对库岸稳定性影响较大,开展库区岸坡
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