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1、JournalofEngineeringGeology工程地質(zhì)學(xué)報(bào)1004-9665/2015/23(5)082708DOI:10.13544/j.cnki.jeg.2015.05.003降雨條件下體積含水率對(duì)堆積體邊坡滲流特性的影響?yīng)逞芯竣佗冖蹚垥?shū)華張海龍趙中華(①三峽大學(xué)科技學(xué)院宜昌443002)(②雅礱江流域水電開(kāi)發(fā)有限公司成都610051)(③湖北清江水電開(kāi)發(fā)有限公司宜昌443002)摘要錦屏水電站對(duì)外交通專(zhuān)用公路K48+722~800段滑坡受降雨影響明顯,其深層穩(wěn)定性關(guān)系到工程安全。本文依
2、據(jù)實(shí)驗(yàn)數(shù)據(jù),采用FredlundXing方法擬合出滑坡體材料的土水特征曲線(xiàn),以體積含水率反應(yīng)土體初始濕潤(rùn)狀態(tài),研究了降雨條件下邊坡壓力水頭的演化規(guī)律,體積含水率對(duì)壓力水頭以及邊坡穩(wěn)定性的影響。結(jié)果表明,降雨初期,坡體表面以及滑面處壓力水頭先增大,并向坡體內(nèi)部逐漸擴(kuò)展。雨停一段時(shí)間后,坡體表面以及前緣區(qū)壓力水頭逐漸消散,滑面后緣局部地區(qū)壓力水頭會(huì)有所升高,壓力水頭隨著體積含水率的增大而增大。體積含水率較小時(shí),在一定的時(shí)間內(nèi),邊坡的穩(wěn)定性系數(shù)先保持穩(wěn)定,后緩慢降低;當(dāng)體積含水率較大時(shí),雨停一定時(shí)間后邊坡的
3、穩(wěn)定性系數(shù)會(huì)出現(xiàn)上升的趨勢(shì)。關(guān)鍵詞體積含水率FredlundXing方法壓力水頭邊坡穩(wěn)定性錦屏水電站中圖分類(lèi)號(hào):U4151文獻(xiàn)標(biāo)識(shí)碼:AINFLUENCEOFVOLUMETRICWATERCONTENTONSEEPAGECHARACTERISTICSOFSLOPEDEPOSITUNDERRAINFALLCONDITIONS①②③ZHANGShuhuaZHANGHailongZHAOZhonghua(①CollegeofScienceandTechnologyofChinaThreeGorgesUni
4、versity,Yichang443002)(②YalongRiverHydropowerDevelopmentCompany,Chengdu610051)(③HubeiQingjiangHydropowerDevelopmentCo.,Ltd.Yichang443002)AbstractThehighwayslopeofK48+722~800inJinpinghydropowerstationisgreatlyaffectedbyrainfall.Thedeepstabilityofthisslope
5、isrelatedtothesafetyofthestationproject.Onthebasisoftheexperimentaldata,thispaperusesFredlundXingmethodtofittheSWCCsoftheslopesoils.Thevolumetricwatercontentisusedtorepresenttheinitialmoiststationofthesoil.Thentheevolutionrulesofpressurehead,theinfluenc
6、eofvolumetricwatercontentonpressureheadandslopestabilityunderrainfallconditionsareresearchednumerically.Theresultsshowthat,thepressureheadattheslopesurfaceandslipincreasesgraduallyatearlyrains.Thentheareawithincreasingpressureheadcanexpendtowardtheinside
7、ofslopebody.Foraperiodoftimeafterrainfall,thepressure收稿日期:2014-06-20;收到修改稿日期:2015-04-21.基金項(xiàng)目:國(guó)家自然科學(xué)基金(41372297)資助.第一作者簡(jiǎn)介:張書(shū)華(1984-),女,碩士,講師,主要從事土建類(lèi)專(zhuān)業(yè)教學(xué)及研究工作.Email:181475677@qq.com828JournalofEngineeringGeology工程地質(zhì)學(xué)報(bào)2015headoftheslopesurfaceandinferiorre
8、giondissipates,whilethepressureheadofpartialtrailingareaofslipincreases.Thepressureheadwouldincreasewiththevolumetricwatercontent.Andwhenthevolumetricwatercontentislittle,thestabilitycoefficientofslopecankeepunchangingfora