新近吹填淤泥地基新型大面积砂被工作垫层工艺技术研发
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摘要
新近吹填淤泥地基经浅表层快速加固技术处理后可作为后续地基处理施工机械的工作平台。然而,该技术工期虽短但施工成本并不低。鉴于此,提出了新型大面积砂被工作垫层的新思路,并对该类垫层地基的承载机制进行了定性分析,依托实际工程开展了现场对比试验研究。研究结果表明:(1)新型大面积砂被工作垫层是一种大型的空间立体式透水性结构,与下卧浮(流)泥地基可构成一个整体的承力体系,具有较高的承载力,其工作机理主要体现为:似壳体效应(包括应力扩散效应与表层封闭效应)、侧向封闭效应(侧限作用)、排水固结作用和竖向加筋作用(仅指浮泥地基);(2)新型大面积砂被工作垫层(试验方案5)整体性好,封闭效应更优,能有效降低施工过程中周边淤泥地基的隆起程度,可作为新近吹填淤泥地基一次性真空预压处理的工作平台。
The newly hydraulic reclamation mud foundation can be treated as a working platform for the construction machinery of subsequent foundation treatment after rapid reinforcement of shallow surface.However,the construction period was short but the construction cost was not low.Therefore,a new idea of newly large area sand-quilt-cushion was put forward,and the bearing mechanism of this kind of cushion foundation was qualitatively analyzed.Based on the actual project,the field comparative test research was carried out.The research results show that:(1) The new type of large area sand-quilt-cushion is a large spatial and 3 D permeable structure; combined with underlying floating(flow) mud foundation,it can form a whole bearing system with high bearing capacity.Its working mechanism is mainly reflected in the shell effect(including the stress diffusion effect and the surface closure effect),the lateral confinement effect,the drainage consolidation effect and the vertical reinforcement effect(only floating mud foundation).(2) The new type of large area sand-quit-cushion(the scheme5) has good integrity and better sealing effect,which can effectively reduce the extent of uplift surrounding foundation during construction process.Therefore,it can be used as a one-time vacuum preloading platform for the newly hydraulic reclamation mud foundation.
The newly hydraulic reclamation mud foundation can be treated as a working platform for the construction machinery of subsequent foundation treatment after rapid reinforcement of shallow surface.However,the construction period was short but the construction cost was not low.Therefore,a new idea of newly large area sand-quilt-cushion was put forward,and the bearing mechanism of this kind of cushion foundation was qualitatively analyzed.Based on the actual project,the field comparative test research was carried out.The research results show that:(1) The new type of large area sand-quilt-cushion is a large spatial and 3 D permeable structure; combined with underlying floating(flow) mud foundation,it can form a whole bearing system with high bearing capacity.Its working mechanism is mainly reflected in the shell effect(including the stress diffusion effect and the surface closure effect),the lateral confinement effect,the drainage consolidation effect and the vertical reinforcement effect(only floating mud foundation).(2) The new type of large area sand-quit-cushion(the scheme5) has good integrity and better sealing effect,which can effectively reduce the extent of uplift surrounding foundation during construction process.Therefore,it can be used as a one-time vacuum preloading platform for the newly hydraulic reclamation mud foundation.
引文
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[11]胡利文,李英杰,林涌潮.大榭港区围海造陆工程软体排施工技术[J].水利水电科技进展,2007,27(3):60-63.HU Liwen,LI Yingjie,LIN Yongchao.Construction technique of soft mattress used in land reclamation at Daxie Port[J].Advances in Science and Technology of Water Resources,2007,27(3):60-63.
[12]曹根祥,丁捍东.长江口深水航道治理工程护底软体排施工成套工艺及设备研发[J].水运工程,2006(12):68-73.CAO Genxiang,DING Handong.Construction technique of soft mattress for bottom protection and development of equipment[J].Port&Waterway Engineering,2006(12):68-73.
[13]季振祥,余振刚,叶修煜.洋山港深水软体排施工技术[J].水运工程,2008(11):161-164.JI Zhenxiang,YU Zhengang,YE Xiuyu.Construction technique of deepwater flexible mattress in Yangshan Port[J].Port&Waterway Engineering,2008(11):161-164.
[14]钱华伟,荣万岭,冯朋.浅谈外海大潮差地区水下大型软体排铺设工艺的改进[J].港工技术,2011,48(2):37-39.QIAN Huawei,RONG Wanling,FENG Peng.Improvement on laying technology of underwater large-scale soft mattress within open sea macro-tidal range area[J].Port Engineering Technology,2011,48(2):37-39.
[15]郝传毅,陈国靖.硬壳层软土地基的工程特性[J].中国公路学报,1993,6(2):68-74.HAO Chuanyi,CHEN Guojing.Engineering features of soft subgrade with relatively hard clay shell[J].China Journal of Highway and Transport,1993,6(2):68-74.
[16]匡志平,胡坚慰.人造硬壳层软土地基处理法的试验研究和理论分析[J].防灾减灾工程学报,2007,27(2):147-151.KUANG Zhiping,HU Jianwei.Theoretical analysis and experimental investigation of artificial hard crust reinforcement[J].Journal of Disaster Prevention and Mitigation Engineering,2007,27(2):147-151.
[17]王晓谋.考虑硬壳层作用的软土地基临塑荷载计算[J].岩土工程学报,2002,24(6):720-723.WANG Xiaomou.Calculation of proportional limit load for soft clay foundation involving the effect of dry crust[J].Chinese Journal of Geotechnical Engineering,2002,24(6):720-723.
[18]问延煦,周健,贾敏才.考虑封闭作用和应力扩散的软土地基临塑荷载[J].岩土力学,2007,28(8):1715-1718.WEN Yanxu,ZHOU Jian,JIA Mincai.Critical edge pressure of soft clay foundation considering closure effect and stress dispersion of crust[J].Rock and Soil Mechanics,2007,28(8):1715-1718.
[19]问延煦,周健.封闭作用对双层地基临塑荷载的影响[J].岩土工程学报,2008,30(5):685-689.WEN Yanxu,ZHOU Jian.Critical edge pressure analysis of two-layered ground considering closure effect[J].Chinese Journal of Geotechnical Engineering,2008,30(5):685-689.
[20]中交天津港湾工程研究院.港口工程地基规范:JTS 147-1—2010[S].北京:人民交通出版社,2010.Tianjin Port Engineering Institute Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.Code for Soil Foundations of Port Engineering:JTS147-1—2010[S].Beijing:China Communications Press,2010.
[21]中交第二航务工程勘察设计院.港口工程地质勘察规范:JTJ240—97[S].北京:人民交通出版社,1997.CCCC Second Harbor Consultants Co.,Ltd..Geologic Investigation Code for Port Engineering:JT J240—97[S].Beijing:China Communications Press,1997.
[22]《工程地质手册》编委会.工程地质手册:第四版[M].北京:中国建筑工业出版社,2006.Editorial board of Engineering Geology Handbook.Engineering Geology Handbook:4th ed[M].Beijing:China Construction Industry Press,2006.
[23]唐芬,何光春,谢远光.加筋地基极限承载力的极限平衡分析[J].重庆交通学院学报,2003,22(4):57-60.TANG Fen,HE Cuangchun,XIE Yuanguang.Analysis of bearing capacity about reinforced-earth foundation based on balance theory of no return[J].Journal of Chongqing Jiaotong University,2003,22(4):57-60.
[24]余卓华.沿海软土地基孔隙水压力消散与地基变形及强度问题试验研究─—以湛江电厂灰堤为例[J].重庆交通学院学报,1995,14(4):105-109.YU Zhuohua.Experimental study on the dissipation of pore water pressure and the foundation deformation and strength in poor ground in seashore area──taking Zhanjiang electric factory as an example[J].Journal of Chongqing Jiaotong University,1995,14(4):105-109.
[2]鲍树峰,董志良,莫海鸿,等.新近吹填淤泥地基真空固结排水系统现场研发[J].岩石力学与工程学报,2014,33(增刊2):4218-4226.BAO Shufeng,DONG Zhiliang,MO Haihong,et al.Field research on drainage system of vacuum preloading technology for fresh hydraulic reclamation silt[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(Sup2):4218-4226.
[3]鲍树峰,莫海鸿,董志良,等.新近吹填淤泥地基负压传递特性及分布模式研究[J].岩土力学,2014,35(12):3569-3576.BAO Shufeng,MO Haihong,DONG Zhiliang,et al.Research on transfer properties and distribution model of negative pressure in fresh hydraulic reclamation muck foundation[J].Rock and Soil Mechanics,2014,35(12):3569-3576.
[4]董志良,张功新,莫海鸿,等.超软弱土浅表层快速加固方法及成套技术:200810026168.4[P].2008-07-23.DONG Zhiliang,ZHANG Gongxin,MO Haihong,et al.The Improvement Method and Technology of Ultra-Soft Soil:200810026168[P].2008-07-23.
[5]董志良,张功新,郑新亮,等.一种超软弱土浅表层快速加固系统:200720050339.8[P].2008-02-20.DONG Zhiliang,ZHANG Gongxin,ZHENG Xinliang,et al.An Improvement System of Shallow Ultra-Soft Soil:200720050339.8[P].2008-02-20.
[6]张功新,陈平山.浅表层超软弱土快速加固技术研究[R].广州:中交四航工程研究院有限公司,2009:1-9.ZHANG Gongxin,CHEN Pingshan.Research of Improvement Technology of Shallow Ultra-Soft Soil[R].Guangzhou:CCCC Fourth Harbor Engineering Institute Co.,Ltd,2009:1-9.
[7]董志良,张功新,周琦,等.天津滨海新区吹填造陆超软土浅层加固技术研发及应用[J].岩石力学与工程学报,2011,30(5):1073-1080.DONG Zhiliang,ZHANG Gongxin,ZHOU Qi,et al.Research and application of improvement technology of shallow ultra-soft soil formed by hydraulic reclamation in Tianjin Binhai new area[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(5):1073-1080.
[8]董志良,周琦,张功新,等.天津滨海新区浅层超软土加固技术现场对比试验[J].岩土力学,2012,33(5):1306-1312.DONG Zhiliang,ZHOU Qi,ZHANG Gongxin,et al.Field comparison test of reinforcement technology of shallow ultra-soft soil in Tianjin Binhai new area[J].Rock and Soil Mechanics,2012,33(5):1306-1312.
[9]许四发.长江口深水航道治理二期工程SIIB标段软基处理之砂被铺设工艺研究[J].水运工程,2004(9):48-52.XU Sifa.Laying technology of sand bag mattress for SIIB bid section soft foundation treatment of Yangtze estuary deep water channel regulation phase II project[J].Port&Waterway Engineering,2004(9):48-52.
[10]林涌潮,黄锦雄,李英杰.复杂工况条件下砂被、通长袋和软体排施工方法的改进[J].水运工程,2005(9):113-117.LIN Yongchao,HUANG Jinxiong,LI Yingjie.Improvement of construction method of sand bags and soft mattresses under complicated working conditions[J].Port&Waterway Engineering,2005(9):113-117.
[11]胡利文,李英杰,林涌潮.大榭港区围海造陆工程软体排施工技术[J].水利水电科技进展,2007,27(3):60-63.HU Liwen,LI Yingjie,LIN Yongchao.Construction technique of soft mattress used in land reclamation at Daxie Port[J].Advances in Science and Technology of Water Resources,2007,27(3):60-63.
[12]曹根祥,丁捍东.长江口深水航道治理工程护底软体排施工成套工艺及设备研发[J].水运工程,2006(12):68-73.CAO Genxiang,DING Handong.Construction technique of soft mattress for bottom protection and development of equipment[J].Port&Waterway Engineering,2006(12):68-73.
[13]季振祥,余振刚,叶修煜.洋山港深水软体排施工技术[J].水运工程,2008(11):161-164.JI Zhenxiang,YU Zhengang,YE Xiuyu.Construction technique of deepwater flexible mattress in Yangshan Port[J].Port&Waterway Engineering,2008(11):161-164.
[14]钱华伟,荣万岭,冯朋.浅谈外海大潮差地区水下大型软体排铺设工艺的改进[J].港工技术,2011,48(2):37-39.QIAN Huawei,RONG Wanling,FENG Peng.Improvement on laying technology of underwater large-scale soft mattress within open sea macro-tidal range area[J].Port Engineering Technology,2011,48(2):37-39.
[15]郝传毅,陈国靖.硬壳层软土地基的工程特性[J].中国公路学报,1993,6(2):68-74.HAO Chuanyi,CHEN Guojing.Engineering features of soft subgrade with relatively hard clay shell[J].China Journal of Highway and Transport,1993,6(2):68-74.
[16]匡志平,胡坚慰.人造硬壳层软土地基处理法的试验研究和理论分析[J].防灾减灾工程学报,2007,27(2):147-151.KUANG Zhiping,HU Jianwei.Theoretical analysis and experimental investigation of artificial hard crust reinforcement[J].Journal of Disaster Prevention and Mitigation Engineering,2007,27(2):147-151.
[17]王晓谋.考虑硬壳层作用的软土地基临塑荷载计算[J].岩土工程学报,2002,24(6):720-723.WANG Xiaomou.Calculation of proportional limit load for soft clay foundation involving the effect of dry crust[J].Chinese Journal of Geotechnical Engineering,2002,24(6):720-723.
[18]问延煦,周健,贾敏才.考虑封闭作用和应力扩散的软土地基临塑荷载[J].岩土力学,2007,28(8):1715-1718.WEN Yanxu,ZHOU Jian,JIA Mincai.Critical edge pressure of soft clay foundation considering closure effect and stress dispersion of crust[J].Rock and Soil Mechanics,2007,28(8):1715-1718.
[19]问延煦,周健.封闭作用对双层地基临塑荷载的影响[J].岩土工程学报,2008,30(5):685-689.WEN Yanxu,ZHOU Jian.Critical edge pressure analysis of two-layered ground considering closure effect[J].Chinese Journal of Geotechnical Engineering,2008,30(5):685-689.
[20]中交天津港湾工程研究院.港口工程地基规范:JTS 147-1—2010[S].北京:人民交通出版社,2010.Tianjin Port Engineering Institute Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.Code for Soil Foundations of Port Engineering:JTS147-1—2010[S].Beijing:China Communications Press,2010.
[21]中交第二航务工程勘察设计院.港口工程地质勘察规范:JTJ240—97[S].北京:人民交通出版社,1997.CCCC Second Harbor Consultants Co.,Ltd..Geologic Investigation Code for Port Engineering:JT J240—97[S].Beijing:China Communications Press,1997.
[22]《工程地质手册》编委会.工程地质手册:第四版[M].北京:中国建筑工业出版社,2006.Editorial board of Engineering Geology Handbook.Engineering Geology Handbook:4th ed[M].Beijing:China Construction Industry Press,2006.
[23]唐芬,何光春,谢远光.加筋地基极限承载力的极限平衡分析[J].重庆交通学院学报,2003,22(4):57-60.TANG Fen,HE Cuangchun,XIE Yuanguang.Analysis of bearing capacity about reinforced-earth foundation based on balance theory of no return[J].Journal of Chongqing Jiaotong University,2003,22(4):57-60.
[24]余卓华.沿海软土地基孔隙水压力消散与地基变形及强度问题试验研究─—以湛江电厂灰堤为例[J].重庆交通学院学报,1995,14(4):105-109.YU Zhuohua.Experimental study on the dissipation of pore water pressure and the foundation deformation and strength in poor ground in seashore area──taking Zhanjiang electric factory as an example[J].Journal of Chongqing Jiaotong University,1995,14(4):105-109.