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1、第34卷第11期巖土工程學(xué)報(bào)Vo1.34No.112O12年l1月ChineseJournalofGeotechnicalEngineeringNov.2012山體滑坡泥石流的地震力算法與防治毛昶熙,段祥寶(南京水利科學(xué)研究院水工水力學(xué)研究所,江蘇南京210029)摘要:近來山體滑坡泥石流地質(zhì)災(zāi)害頻繁,而且與地震和降雨密切相關(guān)。因此提出常規(guī)地震力計(jì)算的一個(gè)改進(jìn)算法,即在考慮地震加速度慣性力的同時(shí)再補(bǔ)充一項(xiàng)地震波持續(xù)振動(dòng)產(chǎn)生的超靜滲透力,它將減輕土體的有效重,更加容易滑坡。對(duì)于風(fēng)化帶亂石土層山坡,以平行坡面的直線滑動(dòng)面為例,分別推導(dǎo)了下雨浸水飽和與非飽和情況下
2、的淺層滑坡計(jì)算公式。經(jīng)過比較不同坡LL,地震加速度和超靜滲透力的計(jì)算結(jié)果,常規(guī)計(jì)算不考慮超靜滲透力時(shí),抗滑安全系數(shù)會(huì)有高達(dá)25%的誤差;當(dāng)山坡下雨浸水飽和時(shí),安全系數(shù)再減半,更易滑坡,在降雨逕流下必然形成泥石流。提出了幾項(xiàng)防治措施,并介紹防治成功的工程實(shí)例。關(guān)鍵詞:山體滑坡;泥石流;地震;超靜滲透力;下雨飽和;滑坡公式;防治措施中圖分類號(hào):TU432文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000—4548(2012)11—2148—04作者簡(jiǎn)介:毛昶熙(1918一),男,河南安陽人,本科,教授級(jí)高級(jí)工程師,長(zhǎng)期從事地下水滲流控制研究。E.mail:xbduan@nhri.
3、ca。MethodforseismicforceofdebrisflowsinducedbylandslidesandtheirpreventionMA0Chang.xi.DUANXiang.bao(HydraulicEngineeringDepartment,NanjingHydraulicResearchInstitute,Nanjing210029,China)Abstract:Recentlythegeologicdisastersoflandslideswithdebrisflowsfrequentlyoccurandcloselyrelateto
4、earthquakesandrainstorms.ThuSitisdesiredtoproposeamodifiedcalculationmethodforseismicforce.Thatis,besidestheoriginalconsiderationoftheinertiaforceofearthquakeacceleration,anothertermoftheexcessseepageforceduetothesuccessivevibrationofearthquakewavesshouldbeaddedforitcanreducetheefe
5、ctiveweightofsoilmassandmakeslopeeasilyslide.Anexampleofaninfinitelandslidewithaparallelstraightlineplaneontheweatheredmountainslopeiscalculated.Tl1eformulasforshallowslideunderrainysaturatedandunsaturatedconditionsarederivedrespectively.Bycomparingthecalculatedresultsunderdifferen
6、tslopegradientearthquakeaccelerationsandexcessseepageforces,thecalculatedsafetyfactorhasanerrorof25%iftheexcessseepageforceisnotconsidered,anditdecreasesfurtheronehalfduringsloperainysaturation.Theslidingsoilmasswillinducedebrisflowsunderrainstormrun.offSomemeasurestopreventlandsli
7、deswithsuccessfulillustrationinengineeringpracticeareproposed.Keywords:landslide;debrisflow;earthquake;excessseepageforce;rainysaturation;formulas;measure0引言滑坡體內(nèi)就是滲流的動(dòng)力(滲透力),已有多篇論文介近兩年,四川汶川大地震、青海玉樹大地震、甘紹【l],而且還有很多工程實(shí)例對(duì)土石壩上游水位急降肅舟曲特大山洪暴雨等多處不斷發(fā)生山體滑坡泥石流時(shí),壩坡穩(wěn)定性進(jìn)行過論證分析,如果不計(jì)算滲透力,地質(zhì)災(zāi)害,造成巨
8、大生命和財(cái)產(chǎn)損失。于此想提出有用規(guī)范中的條分法算出的