复合固化高液限黏土的筑堤性能试验
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摘要
以黑龙江省松花江干流堤防采用高液限黏土作为筑堤材料为工程背景,在高液限黏土中按一定比例综合掺加细砂、水泥、石灰和粉煤灰等材料,通过直剪试验和渗透试验研究了3种配比固化土用于堤防填筑的改良效果.结果表明:固化土的黏聚力、内摩擦角和抗剪强度均明显优于素土;固化土的渗透系数均随压实度的增大而减小,但不同压实度范围内的固化土表现出不同的抗渗性能;养护龄期达到7 d后,增加养护龄期对减小渗透系数没有明显作用.
The modified high liquid limit clay was used as levee filling materials in Songhua River main stream of Heilongjiang Province. Fine sand, cement, lime and fly ash were subjected to the clay with different ratios. Then the modified clay was studied to determine the engineering performance using direct shear test and penetration test. The results show that the cohesion, internal friction angle and shear strength of modified clay are obviously superior to that of the original clay. The permeability coefficient of the modified clay decreases with an increase of compaction degree, whereas the modified clay has different impermeability for various ranges of compaction degrees. After 7 d curing age, the permeability of modified clay keeps unchanged basically with curing age.
The modified high liquid limit clay was used as levee filling materials in Songhua River main stream of Heilongjiang Province. Fine sand, cement, lime and fly ash were subjected to the clay with different ratios. Then the modified clay was studied to determine the engineering performance using direct shear test and penetration test. The results show that the cohesion, internal friction angle and shear strength of modified clay are obviously superior to that of the original clay. The permeability coefficient of the modified clay decreases with an increase of compaction degree, whereas the modified clay has different impermeability for various ranges of compaction degrees. After 7 d curing age, the permeability of modified clay keeps unchanged basically with curing age.
引文
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[3]Kaniraj S R,Havanagi V G.Compressive strength of cement stabilized fly ash-soil mixtures[J].Cement and Concrete Research,1999,29(5):673-677.
[4]Eriktius D T.Shear strength of peaty soil-cement mixes[C]//3rdInternational Conference on Soft Soil Engineering,2001:551-556.
[5]Kolias S,Kasselouri-Rigopoulou V,Karahalios A.Stabilisation of clayey soils with high calcium fly ash and cement[J].Cement and Concrete Composites,2005,27(2):301-313.
[6]杨有海,梁波,丁立.粉煤灰与石灰、水泥拌合料的强度特性试验研究[J].岩土工程学报,2001,23(2):227-230.Yang Youhai,Liang Bo,Ding Li.Experimental study on the strength behaviors of fly ash-lime or fly ash-cement[J].Chinese Journal of Geotechnical Engineering,2001,23(2):227-230.
[7]朱崇辉,王增红.水泥土渗透系数变化规律试验研究[J].长江科学院院报,2013,30(7):59-63.Zhu Chonghui,Wang Zenghong.Experimental study on the change law of permeability coefficient of cement soil[J].Journal of Yangtze River Scientific Research Institute,2013,30(7):59-63.
[8]郭婷婷,张伯平,田志高,等.黄土二灰土工程特性研究[J].岩土工程学报,2004,26(5):719-721.Guo Tingting,Zhang Boping,Tian Zhigao,et al.Study on engineering characteristic of lime-flash loess[J].Chinese Journal of Geotechnical Engineering,2004,26(5):719-721.
[9]张俊峰,戴小松,邹维列,等.水泥改性固化脱水淤泥路用性能试验[J].浙江大学学报(工学版),2015,49(11):2165-2171.Zhang Junfeng,Dai Xiaosong,Zou Weilie,et al.Experiments on pavement performance of solidified sediment modified with cement[J].Journal of Zhejiang University(Engineering Science),2015,49(11):2165-2171.
[10]杨俊,黎新春,童磊.风化砂改良高液限红黏土强度特性试验研究[J].南京理工大学学报(自然科学版),2015,39(2):181-186.Yang Jun,Li Xinchun,Tong Lei.Test on strength property of weathered sand improved high liquid limit red clay[J].Journal of Nanjing University of Science and Technology,2015,39(2):181-186.
[11]林彤,刘祖德.粉煤灰与生石灰加固软土的室内试验研究[J].岩土力学,2003,24(6):1049-1052.Lin Tong,Liu Zude.Study on indoor tests of fly ash and quick lime improving soft soils[J].Rock and Soil Mechanics,2003,24(6):1049-1052.
[12]王东星,徐卫亚.大掺量粉煤灰淤泥固化土的强度与耐久性研究[J].岩土力学,2012,33(12):3659-3664.Wang Dongxing,Xu Weiya.Research on strength and durability of sediments solidified with high volume fly ash[J].Rock and Soil Mechanics,2012,33(12):3659-3664.
[13]李广信,张丙印,于玉贞.土力学[M].北京:清华大学出版社,2013:56.Li Guangxin,Zhang Bingyin,Yu Yuzhen.Soil Mechanics[M].Beijing:Tsinghua University Press,2013:56.
[14]郭鸿,骆亚生,杨永俊.掺黄土粉煤灰的渗透特性[J].西北农林科技大学学报(自然科学版),2009,37(9):219-223.Guo Hong,Luo Yasheng,Yang Yongjun.Permeability characteristic of fly ash added by loess[J].Journal of Northwest A&F University(Natural Science Edition),2009,37(9):219-22.