多通道负压排水动力夯实技术试验
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摘要
应用多通道组合低位负压动力夯实法对南通滨海园区通州湾科教城场地进行加固地基研究,分析水位、表面沉降、土体深层水平位移、孔隙水压力、真空度的变化过程和特性,对处理后地基土的物理性质、强度和承载力进行了检测和评价。结果表明,持续降雨下场地内水位可快速降至3 m以下,非密封条件下抽真空在7 m深度内形成负压,强夯引起的超静孔压可在2~3 d内快速消散;夯实以沉降压缩为主,侧向位移小,土体物理力学性质明显改善,有效影响深度达到6.5 m,地基承载力特征值达到80 k Pa;多通道负压排水动力夯实技术能够增强降排水和超静孔压连续快速消散能力,对地下水丰富、降雨充沛区域的适应性强。
The multi-channel combined with low negative pressure dynamic compaction method was used to reinforce the ground in the Tongzhou Bay Science and Entrepreneurship Town in the coastal zone of Nantong. The change process and characteristics of ground water level,surface settlement,horizontal displacement of deep soil,pore water pressure,and vacuum degree were analyzed. The main physical properties,soil strength,and bearing capacity of the treated foundation were tested and evaluated. The results show that,the underground water level in the field can quickly drop to less than 3 m under the condition of continuous rainfall,a negative pressure condition was formed within a depth of 7 m using the vacuum method under the non-seal condition,and super static pore pressure caused by dynamic compaction can rapidly dissipate in 2 to 3 days. Influence of dynamic compaction was mainly based on settlement compression,the lateral displacement was small,and the physical and mechanical properties of soil were improved significantly,with the effective depth reaching 6.5 m and the characteristic value of bearing capacity of foundation reaching 80 kPa. The new technology can enhance the ability of water drainage and the rapid dissipation of super static pore pressure. It is worth popularizing and applying in areas of abundant groundwater and rainfall.
The multi-channel combined with low negative pressure dynamic compaction method was used to reinforce the ground in the Tongzhou Bay Science and Entrepreneurship Town in the coastal zone of Nantong. The change process and characteristics of ground water level,surface settlement,horizontal displacement of deep soil,pore water pressure,and vacuum degree were analyzed. The main physical properties,soil strength,and bearing capacity of the treated foundation were tested and evaluated. The results show that,the underground water level in the field can quickly drop to less than 3 m under the condition of continuous rainfall,a negative pressure condition was formed within a depth of 7 m using the vacuum method under the non-seal condition,and super static pore pressure caused by dynamic compaction can rapidly dissipate in 2 to 3 days. Influence of dynamic compaction was mainly based on settlement compression,the lateral displacement was small,and the physical and mechanical properties of soil were improved significantly,with the effective depth reaching 6.5 m and the characteristic value of bearing capacity of foundation reaching 80 kPa. The new technology can enhance the ability of water drainage and the rapid dissipation of super static pore pressure. It is worth popularizing and applying in areas of abundant groundwater and rainfall.
引文
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[16]周健,曹宇,贾敏才,等.强夯-降水联合加固饱和软黏土地基试验研究[J].岩土力学,2003,24(3):376-380.(ZHOU Jian,CAO Yu,JIA Mincai,et al.In-situ test study on soft soils improvement by the DCM combined with dewatering[J].Rock and Soil Mechanics,2003,24(3):376-380.(in Chinese))
[17]周健,崔积弘,贾敏才,等.吹填细砂软弱地基处理试验研究[J].岩土力学,2008,29(4):859-864.(ZHOU Jian,CUI Jihong,JIA Mincai,et al.In-situ test study on ground treatment of hydraulic fine soils[J].Rock and Soil Mechanics,2008,29(4):859-864.(in Chinese))
[18]彭中浩,陈永辉,陈庚,等.真空降水联合强夯法加固粉土路基的研究[J].河北工程大学学报(自然科学版),2015,32(2):47-51.(PENG Zhonghao,CHEN Yonghui,CHEN Geng,et al.Experimental research on dynamic consolidation method combined with vacuum well point dewatering to reinforce silt subgrade[J].Journal of Hebei University of Engineering(Natural Science Edition),2015,32(2):47-51.(in Chinese))
[2]娄炎.真空排水预压法加固软土技术[M].北京:人民交通出版社,2013.
[3]殷宗泽.土工原理[M].北京:中国水利水电出版社,2007.
[4]徐至均,张亦农.强夯和强夯置换法[M].北京:机械工业出版社,2004.
[5]中华人民共和国建设部.建筑地基处理技术规范:JGJ79—2012[S].北京:中国建筑工业出版社,2012.
[6]MENARD L,BROISE Y.Theoretical and practical aspects of dynamic consolidation[J].Geotechnique,1975,25(1):3-18.
[7]叶为民,唐益群,杨林德,等.强夯法加固软黏土地基效果研究[J].岩土力学,1998,19(3):7276-7284.(YE Weimin,TANG Yiqun,YANG Linde,et al.Research on effection of improving soft clay with DCM[J].Rock and Soil Mechanics,1998,19(3):7276-7284.(in Chinese))
[8]郑颖人,陆新,李学志,等.强夯加固软黏土地基的理论与工艺研究[J].岩土工程学报,2000,22(1):18-22.(ZHENG Yingren,LU Xin,LI Xuezhi,et al.Research on theory and technology of improving soft clay with DCM[J].Chinese Journal of Geotechnical Engineering,2000,22(1):18-22.(in Chinese))
[9]储旭,陈波,周建芃,等.真空电渗降水及动力挤密脱水加固淤泥技术[J].水利水电科技进展,2008,28(5):78-79.(CHU Xu,CHEN Bo,ZHOU Jianpeng,et al.A novel sediment technique integrating electro-osmotlc drainage and vibro-densification[J].Advances in Science and Technology of Water Resources,2008,28(5):78-79.(in Chinese))
[10]孙召花,高明军,刘志浩,等.导电塑料排水板加固吹填土现场试验[J].河海大学学报(自然科学版),2015,43(3):255-260(SUN Zhaohua,GAO Mingjun,LIU Zhihao,et al.Field test on consolidation of dredger fill using electric vertical drains[J].Journal of Hohai University(Natural Sciences),2015,43(3):255-260.(in Chinese))
[11]范莹莹,朱洪涛,陈思周,等.插板降水强夯置换法在处理砂混黏性土地基中的应用[J].港工技术,2016,53(1):94-98.(FAN Yingying,ZHU Hongtao,CHEN Sizhou,et al.Application of precipitation dynamic consolidation replacemen with plastic drainage plate in the treatment of sand mixed cohesive soil foundation[J].Port Engineering Technology,2016,53(1):94-98.(in Chinese))
[12]唐彤芝,张金良,刘建,等.低位负压立体多通道排水组合夯实装置:中国,ZL201520773090.8[P].2015-09-30.
[13]闫续屏,安明.高水位地基强夯机理及关键施工技术[J].施工技术,2015,44(1):81-83.(YAN Xuping,AN Ming.Construction technology and dynamic compaction mechanism of high water level foundation[J].Construction Technology,2015,44(1):81-83.(in Chinese))
[14]郑晓,刘胜群,卓凡.强夯法设计参数的确定与现场试验研究[J].江西理工大学学报,2007,28(6):46-49.(ZHENG Xiao,LIU Shengqun,ZHUO Fan.Ascertaining the design parameters of intense densification and the study of scene experiment[J].Journal of Jiangxi University of Science and Technology,2007,28(6):46-49.(in Chinese))
[15]朱允伟,韩选江,朱进军,等.真空动力固结法处理新近吹填土地基的加固效果分析[J].工业建筑,2007,37(增刊1):855-858.(ZHU Yunwei,HAN Xuanjiang,ZHU Jinjun,et al.Analysis of the treatment effect of recent dredger fill with vacuum dynamic consolidation[J].Industrial Construction,2007,37(Sup1):855-858.(in Chinese))
[16]周健,曹宇,贾敏才,等.强夯-降水联合加固饱和软黏土地基试验研究[J].岩土力学,2003,24(3):376-380.(ZHOU Jian,CAO Yu,JIA Mincai,et al.In-situ test study on soft soils improvement by the DCM combined with dewatering[J].Rock and Soil Mechanics,2003,24(3):376-380.(in Chinese))
[17]周健,崔积弘,贾敏才,等.吹填细砂软弱地基处理试验研究[J].岩土力学,2008,29(4):859-864.(ZHOU Jian,CUI Jihong,JIA Mincai,et al.In-situ test study on ground treatment of hydraulic fine soils[J].Rock and Soil Mechanics,2008,29(4):859-864.(in Chinese))
[18]彭中浩,陈永辉,陈庚,等.真空降水联合强夯法加固粉土路基的研究[J].河北工程大学学报(自然科学版),2015,32(2):47-51.(PENG Zhonghao,CHEN Yonghui,CHEN Geng,et al.Experimental research on dynamic consolidation method combined with vacuum well point dewatering to reinforce silt subgrade[J].Journal of Hebei University of Engineering(Natural Science Edition),2015,32(2):47-51.(in Chinese))