改良土换填法与石灰桩法加固膨胀土边坡比较
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摘要
为选择合适的膨胀土边坡加固方法,针对改良土换填法与石灰桩法加固膨胀土边坡的效果开展室内试验,并以南京某膨胀土边坡为例,采用FLAC软件建立边坡模型,对加固前后的边坡稳定性进行了分析。结果表明:石灰掺量为3%、5%、7%的改良土加固后边坡稳定性相同,其受换填深度、坡比影响较大;石灰桩法加固后边坡稳定系数与桩体强度和置换率成良好的线性关系,推导建立的加固边坡安全系数公式的计算值和程序求解值吻合较好。综合考虑各种影响因素,对两种边坡加固方法进行了比较,认为石灰桩法加固膨胀土边坡具有工序简单、工期短、对原生环境影响小的优点。
In order to analyze the reinforcement effect of improved soil replacement method and lime pile method to expansive soil slope, improved soil laboratory test was carried out. Taking the expansive soil slope in a region of Nanjing as an example, using FLAC the model of slope was established and the slope stability before and after the consolidation were analyzed. The results show that the slope stability of improved soil with 3%, 5% and 7% dosage are the same, which are greatly affected by the replacement depth and slope ratio. Safety factor of slope reinforced by lime pile has a good linear relationship with pile body strength and replacement rate and the safety factor formula is established. Safety factor deriving from the calculation formula and the value solved by the program are in good agreement. Compared with the improved soil replacement method, it is found that the lime pile method has the advantages of simple process, short construction period and little influence to the primary environment when it is used to deal with the expansive soil slope.
In order to analyze the reinforcement effect of improved soil replacement method and lime pile method to expansive soil slope, improved soil laboratory test was carried out. Taking the expansive soil slope in a region of Nanjing as an example, using FLAC the model of slope was established and the slope stability before and after the consolidation were analyzed. The results show that the slope stability of improved soil with 3%, 5% and 7% dosage are the same, which are greatly affected by the replacement depth and slope ratio. Safety factor of slope reinforced by lime pile has a good linear relationship with pile body strength and replacement rate and the safety factor formula is established. Safety factor deriving from the calculation formula and the value solved by the program are in good agreement. Compared with the improved soil replacement method, it is found that the lime pile method has the advantages of simple process, short construction period and little influence to the primary environment when it is used to deal with the expansive soil slope.
引文
[1] 廖世文.膨胀土与铁路工程[M].北京:中国铁道出版社,1984:273-285.
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[5] 陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009:42-67.
[6] 水利部水利水电规划设计总院.堤防工程设计规范:GB 50286—2013 [S].北京:中国计划出版社,2014:25-27.
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[2] 王保田,张福海.膨胀土的改良技术与工程应用[M].北京:科学出版社,2008:151-210.
[3] 牛志荣.地基处理技术及工程应用[M].北京:中国建材工业出版社,2004:232-237.
[4] 殷宗泽,徐彬.反映裂隙影响的膨胀土边坡稳定性分析[J].岩土力学,2011,33(3):454-459.
[5] 陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009:42-67.
[6] 水利部水利水电规划设计总院.堤防工程设计规范:GB 50286—2013 [S].北京:中国计划出版社,2014:25-27.
[7] BENGT B Broms,唐念慈.用石灰及水泥土柱稳定边坡和深开挖[J].岩土工程学报,1986,8(6):18-25.
[8] 卢廷浩.土力学[M].南京:河海大学出版社,2002:144-160.