钉形粉喷桩加固海相软土地基的现场试验研究

doi:10.3969/j.issn.0258-2724.2012.02.006

基金项目:

国家自然科学基金资助项目(50879011)

江苏省交通科技项目(08Y33)

高等学校省级优秀人才基金资助项目（2012SQRL037)

详细信息

作者简介:
谢胜华(1977－),男,讲师,博士研究生,研究方向为高速公路软弱地基处理,电话: 18994082967, E-mail: xieshua@sina.com

计量
- 文章访问数:1548
- HTML全文浏览量:102
- PDF下载量:390
- 被引次数:0
出版历程
- 收稿日期:2011-12-14
- 修回日期:2011-12-15
- 刊出日期:2012-04-25

Field Tests of Soft Marine Clay Foundation Reinforced by T-shaped Bidirectional Dry Jet Mixing Piles

摘要

摘要:针对常规粉喷桩处理海相软土地基中存在的搅拌不均匀、桩身强度低等问题,提出了钉形双向搅拌粉喷桩的施工工艺.以连云港至临沂高速公路软基处理项目为例,进行了现场单桩施工扰动、单桩静载试验,并对试验过程中的孔隙水压力、土压力等参数进行监测.结果表明:钉形粉喷桩由于上部桩径扩大且进行复搅，使变径深度处的超静孔隙水压力最大,且超过土体的上覆有效应力,单桩施工影响在5~10倍桩体半径范围内；由于增大了上部桩径,承载力比相同直径的双向搅拌粉喷桩和常规(单向)粉喷桩的单桩极限承载力分别提高了36%和76%.因此，钉形粉喷桩具有对施工扰动小、单桩承载力高等优越性.
- 钉形双向搅拌粉喷桩/
- 施工工艺/
- 超静孔隙水压力/
- 静载试验/
- 承载特性
Abstract:In order to overcome disadvantages of the marine soft soil foundation treated by the conventional dry jet mixing(DJM) piles, such as mixing non-uniformity of soil cement and low strength of pile body, a technique of using T-shaped bidirectional DJM piles was proposed to reinforce the soft marine clay foundation in Lianyungang area of China. Single pile tests were conducted in a field site of the Lianyungang-Linyi Expressway (Jiangsu Section). Disturbance effects of DJM during installation and static load test after the construction of the T-shaped bidirectional DJM were analyzed. The dissipation process of the excess pore water pressure after installation, load, and settlement parameters were monitored during the static load test. The results indicate that the excess pore water pressure exceeded the effective overburden stress of the soil during installation, probably due to the larger diameter of upper head of the T-shaped DJM pile and the repeated mixing process. However, excess pore water pressure dissipated quickly just after installation. Single pile installation had an influence scope of 510 times the pile radius. The single pile static load test results indicate that, compared to bidirectional and conventional DJM piles with the same diameter, the ultimate bearing capacity of the T-shaped bidirectional DJM pile increased 36% and 76%, respectively. Therefore, T-shaped bidirectional DJM is characterized by high pile strength and high single pile bearing capacity.
- T-shaped bidirectional dry jet mixing pile/
- construction procedure/
- excess pore pressure/
- static loading test/
- bearing capacity

HTML全文

参考文献 (7)

　 [1]　《地基处理手册》编写委员会. 地基处理手册[M. 3版. 北京:中国建筑工业出版社,2008: 465-467. 　　　　　[2]　刘松玉,钱国超,章定文. 粉喷桩复合地基理论与工程应用[M. 北京:中国建筑工业出版社,2006: 4. 　　　　　[3]　刘松玉,朱志铎,席培胜,等. 钉形搅拌桩与常规搅拌桩加固软土地基的对比研究[J. 岩土工程学报,2009, 31(7): 1059-1068.

　　　　　LIU Songyu, ZHU Zhiduo, XI Peisheng, et al. Comparison between T-shaped deep mixing method and traditional deep mixing method for soft ground improvement[J. Journal of Geotechnical Engineering Investigation, 2009, 31(7): 1059-1068. 　　　　　[4]　朱志铎,刘松玉,席培胜,等. 钉形水泥土双向搅拌桩加固软土地基的效果分析[J. 岩土力学,2009,30(7): 2063-2067.

　　　　　ZHU Zhiduo, LIU Songyu, XI Peisheng, et al. Analysis of effect of T-shaped bidirectional soil-cement deep mixing columns reinforcing soil foundation[J. Rock and Soil Mechanics, 2009, 30(7): 2063-2067. 　　　　　[5]　易耀林,刘松玉,朱志铎. 钉形搅拌桩复合地基承载力特性[J. 建筑结构学报,2010,31(9): 119-125.

　　　　　YI Yaolin, LIU Songyu, ZHU Zhiduo. Bearing capacity of T-shaped soil-cement deep mixed column composite foundation[J. Journal of Building Structures, 2010, 31(9): 119-125. 　　　　　[6]　谢胜华,刘松玉,杜广印,等. 新型粉喷桩加固高含水量软弱地基技术应用[C∥第11届全国地基处理会议论文集. 海口:万国出版社,2010: 434-440. 　　　　　[7]　谢胜华,刘松玉,杜广印,等. 双向搅拌粉喷桩技术开发与应用研究[J. 工程勘察,2011,39(8): 7-11,37.

　　　　　XIE Shenghua, LIU Songyu, DU Guangyin, et al. Technical development on bidirectional dry jet mixing columns and its engineering application[J. Geotechnical Investigation ＆ Surveying, 2011, 39(8): 7-11, 37. 　　　　　[8]　章定文,刘松玉,于新豹. 连云港海相软土工程特性及处治方法探讨[J. 工程地质学报,2003,11(3): 250-257.

　　　　　ZHANG Dingwen, LIU Shongyu, YU Xinbao. Discussion on the engineering characteristics of marine soft soil and method for its treatment in Lianyungang[J. Journal of Engineering Geology, 2003, 11(3): 250-257. 　　　　　[9]　LIU S Y, SHAO G H, DU Y J, et al, Depositional and geotechnical properties of marine clays in Lianyungang, China[J. Engineering Geology, 2011, 121: 66-74. 　　　　　[10]　中国建筑科学研究院. JGJ 1062003 建筑基桩检测技术规范[S. 北京:中国建筑工业出版社,2003. 　　　　[11]　LIN Kaiqiu, WONG I H. Use of deep cement mixture to reduce settlements at bridge appoaches[J. Journal of Geotechnical and Geoenvironmental Engineering, 1999, 125(4): 309-320. 　　　　[12]　BROMS B B. Problems and solutions to construction in soft clay[C∥Proceedings. of the Sixth Asian Regional Conference. Singapore: [s. n., 2001: 3-28. 　　　　[13]　ERIKSSON H, GUNTHER J, RUIN M. MDM combines the advantages of try and wet mixing deep mixing[C∥Proc. Int. Conf. on Deep Mixing Best Practice and Recent Advances. Stockholm：[s. n., 2005: 509-520. 　　　　[14]　中国建筑科学研究院. JGJ 792002 建筑地基处理技术规范[S. 北京:中国建筑工业出版社,2002. 　　　　[15]　龚晓南. 复合地基理论及工程应用[M. 2版.北京:中国建筑工业出版社,2007： 230-233.. 　　　　[16]　罗强,张敏静,张良,等. 路堤荷载作用下高强度桩复合地基土中的应力[J. 江南娱乐网页版入口官网下载安装学报,2010,45(5): 780-786.

　　　　LUO Qiang, ZHANG Minjing, ZHANG Liang, et al. Additional stresses in high strength pile composite foundation under embankment load[J. Journal of Southwest Jiaotong University, 2010, 45(5): 780-786. 　　　　[17]　张良,罗强,刘潇潇,等. 基于现场试验的桩网复合地基垫层效应分析[J. 江南娱乐网页版入口官网下载安装学报,2010,45(5): 787-793.

施引文献

附加材料 (0)

访问统计

点击查看大图

计量

文章访问数:1548
HTML全文浏览量:102
PDF下载量:390
被引次数:0