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1、水利水電技術(shù)第48卷2017年第2期裂陳和土體軟化效應(yīng)雙重影響下膨脹±也彼的穩(wěn)定任分衍楊小明1,張理平1,吳琚華2,朱海琴3,張鴻3,曠聿函4(1.江西公路開發(fā)總公司,江西南昌330038;2.南昌航空大學(xué)土木建筑學(xué)院,江西南昌330063;3.南昌工程學(xué)院土木與建筑工程學(xué)院,江西南昌330099;4.江西工業(yè)貿(mào)易職業(yè)技術(shù)學(xué)院,江西南昌330038)摘要:天然膨脹土經(jīng)歷長期干濕循環(huán),反復(fù)脹縮使其具有多裂隙性和超固結(jié)性。在膨脹土邊坡穩(wěn)定分析中,應(yīng)考慮上述性質(zhì)的共同作用對邊坡穩(wěn)定性的影響。采用FLAC3U中的雙線性應(yīng)變硬化/軟化遍布節(jié)理模型,對不同裂隙面位置
2、和土體軟化效應(yīng)共同影響下的膨脹土邊坡進(jìn)行了穩(wěn)定性分析。結(jié)果表明:裂隙面的存在會顯著降低膨脹土邊坡的穩(wěn)定性。隨著裂隙面與水平正向夾角的減小,邊坡安全系數(shù)呈現(xiàn)出“增一減一增一減一增”的波形關(guān)系,峰值安全系數(shù)出現(xiàn)在200和115。,谷值安全系數(shù)出現(xiàn)在80。和160。??紤]在裂隙面位置和土體軟化效應(yīng)的雙重影響下,邊坡穩(wěn)定性會進(jìn)一步降低,其中土體軟化效應(yīng)對邊坡穩(wěn)定性的影響要小于裂隙面的影響。反傾向小傾角的裂隙面一定程度上可提高邊坡的整體穩(wěn)定性,其與裂隙面的強(qiáng)度參數(shù)及土體的軟化效應(yīng)密切相關(guān)。關(guān)鍵詞:膨脹土;裂隙;軟化;穩(wěn)定性;FLAC3Ddoi:10.13928/j
3、.cnki.wra}le.2017.02.023中圖分類號:Tu443文獻(xiàn)標(biāo)識碼:A文章編號:1000.0860(2017)02.0138.05Analysisonstabm夠ofexpa璐iVe∞nslopeunderdlIalimpactf
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5、an野i,chin8;2.CouegeofCivilEn舀neeringandArchitecture,NanchangHall出ongUniversity,Nanchang330063,Jian野i,China;3.SchoolofCivilEn舀neeringa11dArchitecture,NanchangInstituteofTechnology,Nanchang330099,Jian函,China;4.Jiang)【iVacationalTechIlicalCoUegeofIndus畸&Trade,NaJlchang330038,Jian黔i,
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