MJS工法加固古海塘木桩桩基现场试验研究
摘要:依托钱塘江临江防洪潮古海塘保护研究课题,将MJS高压喷射工法应用于明清古海塘木桩桩基加固。为了研究MJS工法加固后木桩桩基的工作特性,试验现场开展了施工期塘身变形监测以及加固效果测试。变形监测内容为塘身沉降和水平位移,加固效果测试包含静力触探试验和单桩静载荷试验。变形监测结果表明桩尖MJS加固施工期间塘身沉降变形量较小,而塘身水平位移量较明显。加固效果测试结果表明,MJS工法桩半径可达1.5 m以上,加固范围内土层力学指标提高明显;加固后木桩的荷载沉降曲线明显变缓且其单桩极限承载力提高60%以上。
Abstract:The high-pressure jet method, MJS, was applied in the reinforcement of the timber pile foundation located at Ming-Qing ancient seawall based on the research subject on protecting ancient seawall of Qiantang River from flood. In order to investigate the performance properties of timber pile foundation reinforced by MJS method, the monitoring on the deformation of seawall and tests on the treatment effect were carried out on the field. The deformation monitoring includes the settlement and horizontal displacement of seawall, while the tests on the treatment effect consist of the cone penetration test and single-pile static load test. The deformation monitoring shows that the settlement of seawall reinforced by the MJS is small, however, the horizontal displacement is obvious. The tests indicate that the diversity of the radius of pile constructed by MJS method is more than 1.5m; the mechanical strength of soil is obviously improved; the slope of the load-settlement curve of the reinforced timber pile is slowed down, while the bearing capacity of singe timber pile is increased by more than 60%.
中文标题：
MJS工法加固古海塘木桩桩基现场试验研究
Field Test Study on MJS Method Reinforcing Timber Pile Foundation Located at Ancient Seawall
作者：
王拥文1,包增军2,张开伟1
Wang Yongwen1,Bao Zengjun2,Zhang Kaiwei1
作者简介:王拥文,1976年生,男,工程师,主要从事岩土工程监测工作。E-mail:wyw_qisj@163.com
通讯地址：
1. 浙江省钱塘江管理局勘测设计院, 浙江杭州 310016; 2. 浙江省钱塘江管理局, 浙江杭州 310016
1.ReconnaissanceandDesignInstitute,Qian-tangRiverAdministrationofHangzhou310016,Zhejiang,China; 2.Qian-tangRiverAdministrationofZhejiang,Hangzhou310016,Zhejiang,China
中图分类号:TU473.1;TU413
doi:10.3969/j.issn.1007-2993.2013.04.003
出版物：岩土工程技术
收稿日期:2013-04-16
关键词:木桩桩基,MJS工法,现场监测,现场试验,单桩极限承载力
Key words:timber pile foundation,MJS method,field monitoring,field test,ultimate bearing capacity of single pile
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基金项目：
基金项目: 水利部公益性行业基金项目(201001071)
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