水泥固化东湖淤泥的工程性质试验研究
|
摘要
利用将水泥、化学固化剂和机械力脱水三种方法相结合的方式对东湖淤泥进行固化处理,通过界限含水率、强度试验(包括CBR和直剪试验)以及渗透试验研究了在使用水泥固化过程中水泥掺量、养护龄期以及压实度对固化土工程性质的影响。结果发现:仅使用化学固化剂和机械脱水固化处理后的淤泥属于高液限粉土,CBR强度低,不能满足路基填料的要求。使用水泥能够有效提高一次改性固化土的CBR强度和直剪黏聚力,养护龄期对CBR强度影响很小,而水泥掺量、养护龄期和压实度对内摩擦角的影响均不大。此外,在水泥掺量从0%增大到8%的过程中,渗透系数呈现出先增大后减小的趋势,在水泥掺量为2%时达到最大值。综合分析,在水泥二次改性过程中,为符合路基填筑要求,水泥掺量宜为8%,压实度宜大于92%。
This paper used a combined treatment of cement,chemical stabilization and mechanical dehydration to stabilize the East Lake sludge.The effects of cement content,curing age and compaction degree on soil engineering properties was investigated by limit moisture test,strength test(including CBR and direct shear test)and permeability test.The results showed that the East Lake sludge stabilized by chemical stabilization and mechanical dehydration was high liquid limit silt with low CBR strength,and could not meet the requirements of subgrade.Cement could effectively improve the CBR strength and cohesion of the secondary modified cement stabilized soil.Curing age contributed little to CBR strength.Cement content,curing age and compaction degree had little effects on internal friction angle.In addition,permeability coefficient increased at first and then decreased in the process of cement content increasing from 0%to 8%.Permeability coefficient reached the maximum when cement content was 2%.According to the comprehensive analysis in the process of sludge modified by cement,the cement content should be 8%,and compaction degree should be more than 92%to meet the requirements of subgrade filling.
This paper used a combined treatment of cement,chemical stabilization and mechanical dehydration to stabilize the East Lake sludge.The effects of cement content,curing age and compaction degree on soil engineering properties was investigated by limit moisture test,strength test(including CBR and direct shear test)and permeability test.The results showed that the East Lake sludge stabilized by chemical stabilization and mechanical dehydration was high liquid limit silt with low CBR strength,and could not meet the requirements of subgrade.Cement could effectively improve the CBR strength and cohesion of the secondary modified cement stabilized soil.Curing age contributed little to CBR strength.Cement content,curing age and compaction degree had little effects on internal friction angle.In addition,permeability coefficient increased at first and then decreased in the process of cement content increasing from 0%to 8%.Permeability coefficient reached the maximum when cement content was 2%.According to the comprehensive analysis in the process of sludge modified by cement,the cement content should be 8%,and compaction degree should be more than 92%to meet the requirements of subgrade filling.
引文
[1]姬凤玲,朱伟,张春雷.疏浚淤泥的土工材料化处理技术的试验与探讨[J].岩土力学,2004,25(12):1999-2002.(JI Feng-ling,ZHU Wei,ZHANG Chun-lei.Study of treatment technology of dredging sludge with geosynthetizing method[J].Rock and Soil Mechanics,2004,25(12):1999-2002.(in Chinese))
[2]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 Wei-ya.Research on strength and durability of sediments solidified with high volume fly-ash[J].Rock and Soil Mechanics,2012,33(12):3659-3664.(in Chinese))
[3]白玉恒.粉煤灰固化淤泥路用性能及填筑技术研究[D].上海:上海交通大学,2009.(BAI Yu-heng.Study on road performance and filling technology of solidified muddy soil by fly-ash[D].Shanghai:Shanghai Jiao Tong University,2009.(in Chinese))
[4]范公俊.固化淤泥的收缩性质及其控制措施研究[D].南京:河海大学,2007.(FAN Gong-jun.Study on the shrinkage property and shrinkage control of solidified dredged material[D].Nanjing:Hohai University,2007.(in Chinese))
[5]黄英豪,朱伟,张春雷,等.固化淤泥重塑土力学性质及其强度来源[J].岩土力学,2009,30(5):1352-1356.(HUANG Ying-hao,ZHU Wei,ZHANG Chun-lei,et al.Mechanical characteristics and strength source of remolded solidified dredged material[J].Rock and Soil Mechanics,2009,30(5):1352-1356.(in Chinese))
[6]黄英豪,董婵,关云飞,等.击实对固化淤泥物理力学性质的影响[J].岩土工程学报,2012,34(09):1728-1733.(HUANG Ying-hao,DONG Chan,GUAN Yun-fei,et al.Effect of compaction on physical and mechanical properties of solidified dredged materials[J].Chinese Journal of Geotechnical Engineering,2012,34(09):1728-1733.(in Chinese))
[7]黄英豪,朱伟,周宣兆,等.固化淤泥压缩特性的试验研究[J].岩土力学,2012,33(2):2923-2928.(HUANG Ying-hao,ZHU Wei,ZHOU Xuan-zhao,et al.Experimental study of compressibility behavior of solidified dredged material[J].Rock and Soil Mechanics,2012,33(2):2923-2928.(in Chinese))
[8]朱伟,冯志超,张春雷,等.疏浚泥固化处理进行填海工程的现场试验研究[J].中国港湾建设,2005(5):27-30.(ZHU Wei,FENG Zhi-chao,ZHANG Chun-lei,et al.Field experiment of dredged spoil solidified with cement for marine reclamation works[J].China Harbour Engineering,2005(5):32-35.(in Chinese))
[9]刘仁钊.基于不同固化剂作用下淤泥改良前后力学性能变化研究[D].广州:广东工业大学,2013.(LIU Renz-hao.Based on the effect of different curing agents and the change of mechanical properties of sludge improved research[D].Guangzhou:Guangdong University of Technology,2013.(in Chinese))
[10]Bahar R,Benazzoug M,Kenai S.Performance of compacted cement-stabilised soil[J].Cement and Concrete Composites.2004,26(7):811-820.
[11]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.
[12]耿树泽,侯明业,赵娟娟,等.HSC301化淤泥填筑路基性能研究[J].筑路机械与施工机械化.2013(6):49-51.(GENG Shuze,HOU Ming-ye,ZHAO Juan-juan,et al.Study on performance of subgrade built with HSC301solidified silt[J].Road Machinery&Construction Mechanization,2013(6):49-51.(in Chinese))
[13]陈士强,季光明,杨国录等.清淤泥浆脱水固结一体化处理方法[P].中国:CN101746942A,2010.(CHENG Shi-qiang,JI Guang-ming,YANG Guo-lu,et al.Dredging dewatering and consolidation of mud integration processing method[P]China:CN101746942A,2010
[14]JTG D030-2004,公路路基设计规范[S].2004.(JTG D030-2004,Specifications for Design of Highway Subgrades[S].2004.(in Chinese))
[15]陈仲颐,周景星,王洪谨.土力学[M].北京:清华大学出版社,1994.(CHEN Zhong-yi,ZHOU Jing-xing,WANG Hong-jin.Soil Mechanics[M].Beijing:Tsinghua University Press,1994.(in Chinese))
[16]白寿光.某市政道路改良土水泥掺量研究[J].山西建筑.2007,33(10):303-304.(BAI Shou-guang.Research into cement admixture quantity of improved soil in a certain municipal road[J].Shanxi Architecture,2007,33(10):303-304.(in Chinese))
[2]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 Wei-ya.Research on strength and durability of sediments solidified with high volume fly-ash[J].Rock and Soil Mechanics,2012,33(12):3659-3664.(in Chinese))
[3]白玉恒.粉煤灰固化淤泥路用性能及填筑技术研究[D].上海:上海交通大学,2009.(BAI Yu-heng.Study on road performance and filling technology of solidified muddy soil by fly-ash[D].Shanghai:Shanghai Jiao Tong University,2009.(in Chinese))
[4]范公俊.固化淤泥的收缩性质及其控制措施研究[D].南京:河海大学,2007.(FAN Gong-jun.Study on the shrinkage property and shrinkage control of solidified dredged material[D].Nanjing:Hohai University,2007.(in Chinese))
[5]黄英豪,朱伟,张春雷,等.固化淤泥重塑土力学性质及其强度来源[J].岩土力学,2009,30(5):1352-1356.(HUANG Ying-hao,ZHU Wei,ZHANG Chun-lei,et al.Mechanical characteristics and strength source of remolded solidified dredged material[J].Rock and Soil Mechanics,2009,30(5):1352-1356.(in Chinese))
[6]黄英豪,董婵,关云飞,等.击实对固化淤泥物理力学性质的影响[J].岩土工程学报,2012,34(09):1728-1733.(HUANG Ying-hao,DONG Chan,GUAN Yun-fei,et al.Effect of compaction on physical and mechanical properties of solidified dredged materials[J].Chinese Journal of Geotechnical Engineering,2012,34(09):1728-1733.(in Chinese))
[7]黄英豪,朱伟,周宣兆,等.固化淤泥压缩特性的试验研究[J].岩土力学,2012,33(2):2923-2928.(HUANG Ying-hao,ZHU Wei,ZHOU Xuan-zhao,et al.Experimental study of compressibility behavior of solidified dredged material[J].Rock and Soil Mechanics,2012,33(2):2923-2928.(in Chinese))
[8]朱伟,冯志超,张春雷,等.疏浚泥固化处理进行填海工程的现场试验研究[J].中国港湾建设,2005(5):27-30.(ZHU Wei,FENG Zhi-chao,ZHANG Chun-lei,et al.Field experiment of dredged spoil solidified with cement for marine reclamation works[J].China Harbour Engineering,2005(5):32-35.(in Chinese))
[9]刘仁钊.基于不同固化剂作用下淤泥改良前后力学性能变化研究[D].广州:广东工业大学,2013.(LIU Renz-hao.Based on the effect of different curing agents and the change of mechanical properties of sludge improved research[D].Guangzhou:Guangdong University of Technology,2013.(in Chinese))
[10]Bahar R,Benazzoug M,Kenai S.Performance of compacted cement-stabilised soil[J].Cement and Concrete Composites.2004,26(7):811-820.
[11]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.
[12]耿树泽,侯明业,赵娟娟,等.HSC301化淤泥填筑路基性能研究[J].筑路机械与施工机械化.2013(6):49-51.(GENG Shuze,HOU Ming-ye,ZHAO Juan-juan,et al.Study on performance of subgrade built with HSC301solidified silt[J].Road Machinery&Construction Mechanization,2013(6):49-51.(in Chinese))
[13]陈士强,季光明,杨国录等.清淤泥浆脱水固结一体化处理方法[P].中国:CN101746942A,2010.(CHENG Shi-qiang,JI Guang-ming,YANG Guo-lu,et al.Dredging dewatering and consolidation of mud integration processing method[P]China:CN101746942A,2010
[14]JTG D030-2004,公路路基设计规范[S].2004.(JTG D030-2004,Specifications for Design of Highway Subgrades[S].2004.(in Chinese))
[15]陈仲颐,周景星,王洪谨.土力学[M].北京:清华大学出版社,1994.(CHEN Zhong-yi,ZHOU Jing-xing,WANG Hong-jin.Soil Mechanics[M].Beijing:Tsinghua University Press,1994.(in Chinese))
[16]白寿光.某市政道路改良土水泥掺量研究[J].山西建筑.2007,33(10):303-304.(BAI Shou-guang.Research into cement admixture quantity of improved soil in a certain municipal road[J].Shanxi Architecture,2007,33(10):303-304.(in Chinese))