智能化振杆密实法加固海陆交互相液化地基试验研究  

FIELD TESTS ON IMPROVEMENT OF SEA-LAND INTERACTION LIQUEFIABLE GROUND THROUGH INTELLIGENT VIBRATORY PROBE COMPACTION METHOD

作　　者：李亚霖 杜广印[1,2] 毛峥嵘 王传乐 高常辉 庄仲旬 杨泳 LI Yalin;DU Guangyin;MAO Zhengrong;WANG Chuanle;GAO Changhui;ZHUANG Zhongxun;YANG Yong(School of Transportation,Southeast University,Nanjing 210096,China;Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety,Southeast University,Nanjing 210096,China;Nanjing Geological Engineering Survey Institute,Nanjing 210041,China;Jiangsu Shengtai Construction Engineering Co.,Ltd.,Lianyungang 222000,China)

机构地区：[1]东南大学交通学院,南京210096 [2]江苏省城市地下工程与环境安全重点实验室,南京210096 [3]南京地质工程勘察院,南京210041 [4]江苏盛泰建设工程有限公司,连云港222000

出　　处：《工程地质学报》2024年第2期690-698,共9页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:42277153,41977241)。

摘　　要：长江三角洲地区广泛分布着海陆交互相液化地基,具有粉土、粉砂、淤泥质粉质黏土互层的工程地质特点。随着我国高速公路建设快速发展,对此类海陆交互相液化地基的处理已迫在眉睫。本文依托洋通高速公路工程项目,采用具有自主知识产权的智能化振杆密实法施工技术对海陆交互相液化地基进行了加固处理,通过室内试验、原位测试和填筑期沉降监测等方法,综合评价了该技术处理海陆相交互相液化地基的加固效果,并与碎石桩法的处理效果进行对比。研究结果表明:智能化振杆密实法处理后,试验场地土体密度、内摩擦角、压缩模量等均得到明显提高,含水量和孔隙比明显降低;处理范围内土层的锥尖阻力、侧摩阻力和标准贯入试验锤击数较处理前提高了80%以上,测试波速则提升了15%,预测工后沉降为10.36 mm,满足了高速公路建设要求。振杆密实法工程费用相比碎石桩法可节约38.0%,且施工过程自动化、可视化程度高,具有显著的经济效益与应用前景。The Yangtze River delta region displays distinctive engineering geological features characterized by sea-land interaction liquefiable ground,comprised of chalk,silt,and soft clay layers.As China's highway infrastructure advances rapidly,there is a pressing need to address the challenges posed by this type of ground.The Yangtong Highway project successfully utilized the innovative vibratory probe compaction method to enhance the sea-land intersection liquefiable ground.A comprehensive assessment of this method's effectiveness was conducted through a series of tests including indoor experiments,in-situ assessments,and settlement monitoring throughout the filling process,with a comparative analysis against traditional stone columns method.Results from the study revealed a significant enhancement in the density,internal friction angle,and compression modulus of the test area,accompanied by notable reductions in water content and void ratio.Furthermore,key soil properties such as cone resistance,sleeve friction,and SPT blow counts exhibited an increase exceeding 80%post-treatment,while surface wave velocity saw a 15%boost.The projected settlement after completion stood at 10.36 mm,meeting the required standards for highway construction.Notably,the vibratory probe compaction method proved to be 38.0%more cost-effective than the stone columns approach,boasting a streamlined and visualized construction process that is both automated and efficient,showcasing promising economic viability and future application prospects.

关 键 词：海陆交互相液化地基 智能化施工 振杆密实法 碎石桩法 加固效果评价 

分 类 号：U416.11[交通运输工程—道路与铁道工程]