滨海相软土中搅拌桩强度特征分析
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摘要
连临高速江苏段路基地层为滨海相软土,该软土层具有含水量、含盐量高及压缩性大的特点,路基采用水泥土搅拌桩进行加固。针对这一问题,对滨海相软土中水泥土搅拌桩的强度特征进行了研究。室内试验结果表明,该路基中水泥土强度随水泥掺量的增加而增大。在饱水状态下,28 d内水泥土强度有所增大,28 d后几乎不变,但水泥土强度随含水量的增大而减小,由于下部土层中含水量和含盐量高,导致桩身水泥土波速和强度具有上部大、下部小的特点,试验结果与现场钻探取样试验结果一致。
The strata of Lianlin highway foundation are made up by marine soft soils and characterized by high moisture,salt content and compression.The roadbed is strengthened by the mixed cement pile.This paper analyzes the strength characteristics of mixed cement pile in the marine soft soil.The indoor experiment results indicates that the strength of the cement-soil increases with the increment of the cement content.In the water-saturated state,the strength of the cement-soil increases within 28 days,but increases little after 28 days.The water content influ-ences the intensity of grouted soil negatively.The wave velocity and the strength of the cement-soil from borehole are high in the upper and low in the lower of the pile.
The strata of Lianlin highway foundation are made up by marine soft soils and characterized by high moisture,salt content and compression.The roadbed is strengthened by the mixed cement pile.This paper analyzes the strength characteristics of mixed cement pile in the marine soft soil.The indoor experiment results indicates that the strength of the cement-soil increases with the increment of the cement content.In the water-saturated state,the strength of the cement-soil increases within 28 days,but increases little after 28 days.The water content influ-ences the intensity of grouted soil negatively.The wave velocity and the strength of the cement-soil from borehole are high in the upper and low in the lower of the pile.
引文
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[2]刘正峰.地基与基础工程新技术[M].北京:海潮出版社,2000.
[3]潘殿琦,陈勇.深层搅拌桩强度的影响因素与改善措施[J].岩石力学与工程学报,2004,23(11):19541958.
[4]张卫国.盐渍土地区工程质量常见病例分析[J].科技情报开发与经济,2004,14(1):131132.
[5]白晓红,赵永强,韩鹏举,等.污染环境对水泥土力学特性影响的试验研究[J].岩土工程学报,2007,29(8):12601263.
[6]董晓强,白晓红,赵永强,等.硫酸污染下水泥土的电阻率变化研究[J].岩土力学,2007,28(7):1453–1458.
[7]宁宝宽,陈四利,刘斌.水泥土的环境侵蚀效应与破裂过程分析[J].岩石力学与工程学报,2005,24(10):1778–1782.
[8]郭迅,黄玉龙,殷建华.Bender Elements在测试土样剪切波速中的应用[J].地震工程与工程振动,2000,20(2):9296.
[9]姬美秀,陈云敏,黄博.弯曲元试验高精度测试土样剪切波速方法[J].岩土工程学报,2003,25(6):732736.
[10]周健,赵飞阳,白彦峰,等.弹性波速与水泥土强度关系的试验研究[J].岩土工程界,2009,12(10):7173.
[11]唐彤芝,袁宏义.水泥土搅拌法处理高含水量软基的关键问题分析[J].岩石力学与工程学报,2004,23(增1):46534657.
[12]马可,阎长虹,郭军辉,等.盐类对水泥土强度影响的试验研究[J].中国水运,2009,9(11):199200.
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