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时间:2019-05-15
《泥石流常用排导槽水力条件的比较》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第25卷增1岩石力学与工程学报Vol.25Supp.12006年2月ChineseJournalofRockMechanicsandEngineeringFeb.,2006泥石流常用排导槽水力条件的比较游勇,柳金峰,欧国强(中国科学院成都山地灾害与环境研究所,四川成都610041)摘要:目前泥石流防治工程中广泛采用的横断面型式主要有直墙V型断面、梯型断面、矩型断面、圆型断面。将泥石流排导槽的断面型态系数定义为湿周与水力半径之比,在此基础上推导出直墙V型、梯型、矩型、圆型排导槽水力最佳时相应的断面型态系数,对相同槽型排导槽水力断面的研究表明:直墙V型槽横坡系数
2、在0~3时,随横坡系数增大,水力条件更优;横坡系数大于3后,随横坡系数的增大,水力条件越差;横坡系数等于3时,水力条件最佳。梯型槽边坡系数在0~0.577时,随边坡系数增大,水力条件越优;边坡系数大于0.577后,随边坡系数的增大,水力条件越差,边坡系数等于0.577时,水力条件最佳。对直墙V型、梯型、矩型、圆型槽的水力最佳断面进行了分析比较,结果表明:圆型断面排导槽水力条件比其他3种都优;当边坡系数大于0,小于等于1.333时,梯型槽较矩型断面优越;当边坡系数大于1.333时,梯型槽没有矩型槽优越。当横坡系数大于0,小于0.75时,直墙V型槽没有矩型优越;
3、当横坡系数大于0.75时,直墙V型槽比矩型优越;在横坡系数、边坡系数值相同的情况下,且在0与1之间时,梯型槽比直墙V型槽优越;当大于1时,梯型槽没有直墙V型槽优越;当两者均为1时,水力条件相同。关键词:岩土工程;泥石流;排导槽;断面型态参数;水力最佳断面中图分类号:TU43文献标识码:A文章编号:1000–6915(2006)增1–2820–06COMPARISONOFHYDRAULICCONDITIONSAMONGUSUALDEBRISFLOWDRAINAGECANALYOUYong,LIUJinfeng,OUGuoqiang(InstituteofMou
4、ntainHazardsandEnvironment,ChineseAcademyofSciences,Chengdu,Sichuan610041,China)Abstract:Thetriangular,trapezoid,rectangularandcirculartransectsareappliedasdebrisflowdrainagecanalwidelyatpresent.Thesectionfactorcoefficientisdefinedastheratioofwetperimeterandhydraulicradius,andthese
5、ctionfactorcoefficientsoffourkindsofdebrisflowdrainagecanals(triangle,trapezoid,rectangleandrotundity)arededuced.Whenthebedslopecoefficientoftriangulardrainagecanalisgreaterthan0andlessthan3,withthebedslopecoefficientincreasing,thehydraulicconditionismoreadvantageous.Andwhilethebed
6、slopecoefficientisgreaterthan3,thehydraulicconditionbecomedisadvantageous.Thehydraulicconditionofdebrisflowdrainagecanalisbestasthebedslopecoefficientisequalto3.Whenthebedslopecoefficientoftrapezoiddrainagecanalisgreaterthan0andlessthan0.577,withthebedslopecoefficientincreasing,the
7、hydraulicconditionismoreadvantageous.Whilethebedslopecoefficientisgreaterthan0.577,thehydraulicconditionbecomedisadvantageous,andthehydraulicconditionofdebrisflowdrainagecanalisbestasthebedslopecoefficientisequalto0.577.Thehydraulicconditionofcircularsectionisbestamongfourkindsofdr
8、ainagecanals.whenthebedslo
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