阜新—朝阳高速公路段湿陷性黄土路基处理方法及效果
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摘要
对辽西黄土进行强夯法、灰土挤密桩法和冲击碾压法加固路基的试验研究,旨在确定辽西湿陷性黄土路基处理的技术方案和技术参数。以现场测试和室内试验相结合的方法,对试验路段的不同处理方法处理前后的黄土物理力学性质进行了对比。结果表明:(1)夯击能为800~1600 kN.m、夯击数不小于8击,对处理深度4~6 m的黄土较为有效;(2)灰土挤密桩法可以消除桩深范围内及桩端下一定范围内的黄土湿陷性,较适合于深厚湿陷性黄土的处理;(3)冲击碾压法适合处理黄土厚度较小和表层黄土的处理,碾压遍数以40遍为最佳,其处理深度在1 m左右。这些成果为该地区湿陷性路基处理提供了参考。
In order to determine the technical program and technical parameters for stabilizing collapsible loess of subgrade treatment in west of Liaoning,some experimental research of stabilizing subgrade,such as,dynamic compaction,impact-rolling and lime soil pile,has been carried out.Combining in-situ test with laboratory experiment,the physical and mechanical properties in experimental areas are compared before and after treatment,and some conclusions are drawn out such as:(1) It is effective to treat 4 m to 6 m in depth under 800 kN·m to 1 600 kN·m in compaction energy without with not less than 8 tamper times;(2) Lime soil pile is suitable to improve subgrade with thick loess,which can dispel the loess collapisibility either in the range of pile length or in a certain extent from pile end;(3) The method of impact-rolling is useful to treat loess with the less thickness of the layer and topsoil with about 1m in depth,and impact rolling is optimal in 40 times.The result mentioned above provided a technical references for collapsible loess sudgrade treatment in this area.
In order to determine the technical program and technical parameters for stabilizing collapsible loess of subgrade treatment in west of Liaoning,some experimental research of stabilizing subgrade,such as,dynamic compaction,impact-rolling and lime soil pile,has been carried out.Combining in-situ test with laboratory experiment,the physical and mechanical properties in experimental areas are compared before and after treatment,and some conclusions are drawn out such as:(1) It is effective to treat 4 m to 6 m in depth under 800 kN·m to 1 600 kN·m in compaction energy without with not less than 8 tamper times;(2) Lime soil pile is suitable to improve subgrade with thick loess,which can dispel the loess collapisibility either in the range of pile length or in a certain extent from pile end;(3) The method of impact-rolling is useful to treat loess with the less thickness of the layer and topsoil with about 1m in depth,and impact rolling is optimal in 40 times.The result mentioned above provided a technical references for collapsible loess sudgrade treatment in this area.
引文
[1]钱鸿绪,罗宇生.湿陷性黄土地基[M].北京:中国建筑工业出版社,1985.QIAN Hong-xu,LUO Yu-sheng.Collapisible loesssubsoil[M].Beijing:China Architecture&BuildingPress,1985.
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[4]苗天德,刘忠玉,任九牛.湿陷性黄土的变形机理与本构关系[J].岩土工程学报,1999,21(4):383-387.MIAO Tian-de,LI U Zhong-yu,REN Jiu-niu.Defor-mationn mechanismand constitutive relation of collap-sible loess[J].Journal of Geotechnical Engineering,1999,21(4):383-387.
[5]罗宇生.湿陷性黄土地基评价[J].岩土工程学报,1998,20(4):87-91.LUO Yu-sheng.Evaluation for collapsible loessground[J].Journal of Geotechnical Engineering,1998,20(4):87-91.
[6]谢定义.试论我国黄土力学研究中的若干新趋向[J].岩土工程学报,2001,23(1):3-12.XIE Ding-yi.On some new tendency in research ofChinese loess mechnics[J].Journal of GeotechnicalEngineering,2001,23(1):3-12
[7]张炜,张苏民.我国黄土工程性质研究的发展[J].岩土工程学报,1995,17(6):81-88.ZHANG Wei,ZHANG Su-min.Development of engi-neering properties research for Chinese loess[J].Jour-nal of Geotechnical Engineering,1995,17(6):81-88.
[8]石玉成,李兰,刘红玫.黄土的震陷性与其微结构特征的关系研究[J].西北地震学报,2002,24(2):129-134.SHI Yu-cheng,LI Lan,LI U Hong-mei.A study onrelationship between vibrated collapsibility and its mi-crostructure character[J].Northwestern SeismologicalJournal,2002,24(2):129-134.
[9]沈珠江,胡再强.黄土的二元介质模型[J].水利学报,2003(7):1-6.SHEN Zhu-jiang,HU Zai-qiang.Two-element mediamodel of loess[J].Journal of Hydraulic Engineering,2003(7):1-6.
[10]雷胜友,唐文栋,王晓谋,等.原状黄土损伤破坏过程的CT扫描分析(Ⅱ)[J].铁道科学与工程学报,2005,2(1):53-56.LEI Sheng-you,TANG Wen-dong,WANG Xiao-mou,et al.CT scan analysis for damage failureprpcess of undisturbed loess(Ⅱ)[J].Journal of Rail-way Science and Engineering,2005,2(1):53-56.
[11]卢全中,彭建兵.黄土体工程地质的研究体系及若干问题探讨[J].吉林大学学报(地球科学版),2006,36(3):404-409.LU Quan-zhong,PENG Jian-bing.Research on sys-tematic frame and some problems of engineeringgeology of loess mass[J].Journal of Jilin University(Earth Science Edition),2006,36(3):404-409.
[12]王生新,韩文峰,谌文武.冲击压实法加固湿陷性黄土路基的应用研究[J].岩石力学与工程学报,2003,22(增刊):2848-2852.WANG Sheng-xin,HAN Wen-feng,ZHAN Wen-wu.Application of i mpact-rolling method used to sta-bilze collapsible loess ground[J].Journal of RockMechanics and Engineering,2003,22(Sup.):2848-2852.
[13]张伯平,席丁民,张玉香.关中西部黄土地基强夯处理工程效果研究[J].西北农业大学学报,2000,28(5):95-99.ZHANG Bo-ping,XI Ding-min,ZHANG Yu-xiang.Astudy on compaction treat ment effect for loess sug-rade in west of Guanzhong[J].Sci-Tech University ofAgriculture and Forestry(Natural Science Edition),2000,28(5):95-99.
[14]陕西省计划委员会.GB 50025-2004湿陷性黄土地区建筑规范[S].北京:中国建筑工业出版社,2004.Shaanxi Province Planned Committee.GB 50025-2004 Code for building construction in collapsible lo-ess regions[S].Beijing:China Architecture&Building Press,2004.
[15]中国建筑科学研究院.JGJ 79-2002建筑地基处理技术规范[S].北京:中国建筑工业出版社,2002.Chinese Architecture Science Academe.JGJ79-2002Technical code for ground treat ment of buildings[S].Beijing:China Architecture&Building Press,2002.
[2]陈正汉,刘祖典.黄土的湿陷变形机理[J].岩土工程学报,1986,8(2):1-12.CHEN Zheng-han,LI U Zu-dian.Collapsible diforma-tion mechanism of loess[J].Journal of GeotechnicalEngineering,1986,8(2):1-12.
[3]王永焱,林在贯.中国黄土的结构特性及物理力学性质[M].北京:科学出版社,1990.WANG Yong-yan,LIN Zai-guan.Structure and phy-sical and mechnical properties of Chinese loess[M].Beijing:Science Press,1990.
[4]苗天德,刘忠玉,任九牛.湿陷性黄土的变形机理与本构关系[J].岩土工程学报,1999,21(4):383-387.MIAO Tian-de,LI U Zhong-yu,REN Jiu-niu.Defor-mationn mechanismand constitutive relation of collap-sible loess[J].Journal of Geotechnical Engineering,1999,21(4):383-387.
[5]罗宇生.湿陷性黄土地基评价[J].岩土工程学报,1998,20(4):87-91.LUO Yu-sheng.Evaluation for collapsible loessground[J].Journal of Geotechnical Engineering,1998,20(4):87-91.
[6]谢定义.试论我国黄土力学研究中的若干新趋向[J].岩土工程学报,2001,23(1):3-12.XIE Ding-yi.On some new tendency in research ofChinese loess mechnics[J].Journal of GeotechnicalEngineering,2001,23(1):3-12
[7]张炜,张苏民.我国黄土工程性质研究的发展[J].岩土工程学报,1995,17(6):81-88.ZHANG Wei,ZHANG Su-min.Development of engi-neering properties research for Chinese loess[J].Jour-nal of Geotechnical Engineering,1995,17(6):81-88.
[8]石玉成,李兰,刘红玫.黄土的震陷性与其微结构特征的关系研究[J].西北地震学报,2002,24(2):129-134.SHI Yu-cheng,LI Lan,LI U Hong-mei.A study onrelationship between vibrated collapsibility and its mi-crostructure character[J].Northwestern SeismologicalJournal,2002,24(2):129-134.
[9]沈珠江,胡再强.黄土的二元介质模型[J].水利学报,2003(7):1-6.SHEN Zhu-jiang,HU Zai-qiang.Two-element mediamodel of loess[J].Journal of Hydraulic Engineering,2003(7):1-6.
[10]雷胜友,唐文栋,王晓谋,等.原状黄土损伤破坏过程的CT扫描分析(Ⅱ)[J].铁道科学与工程学报,2005,2(1):53-56.LEI Sheng-you,TANG Wen-dong,WANG Xiao-mou,et al.CT scan analysis for damage failureprpcess of undisturbed loess(Ⅱ)[J].Journal of Rail-way Science and Engineering,2005,2(1):53-56.
[11]卢全中,彭建兵.黄土体工程地质的研究体系及若干问题探讨[J].吉林大学学报(地球科学版),2006,36(3):404-409.LU Quan-zhong,PENG Jian-bing.Research on sys-tematic frame and some problems of engineeringgeology of loess mass[J].Journal of Jilin University(Earth Science Edition),2006,36(3):404-409.
[12]王生新,韩文峰,谌文武.冲击压实法加固湿陷性黄土路基的应用研究[J].岩石力学与工程学报,2003,22(增刊):2848-2852.WANG Sheng-xin,HAN Wen-feng,ZHAN Wen-wu.Application of i mpact-rolling method used to sta-bilze collapsible loess ground[J].Journal of RockMechanics and Engineering,2003,22(Sup.):2848-2852.
[13]张伯平,席丁民,张玉香.关中西部黄土地基强夯处理工程效果研究[J].西北农业大学学报,2000,28(5):95-99.ZHANG Bo-ping,XI Ding-min,ZHANG Yu-xiang.Astudy on compaction treat ment effect for loess sug-rade in west of Guanzhong[J].Sci-Tech University ofAgriculture and Forestry(Natural Science Edition),2000,28(5):95-99.
[14]陕西省计划委员会.GB 50025-2004湿陷性黄土地区建筑规范[S].北京:中国建筑工业出版社,2004.Shaanxi Province Planned Committee.GB 50025-2004 Code for building construction in collapsible lo-ess regions[S].Beijing:China Architecture&Building Press,2004.
[15]中国建筑科学研究院.JGJ 79-2002建筑地基处理技术规范[S].北京:中国建筑工业出版社,2002.Chinese Architecture Science Academe.JGJ79-2002Technical code for ground treat ment of buildings[S].Beijing:China Architecture&Building Press,2002.
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