振杆密实法加固液化地基施工扰动与影响因素试验  

Experiment of Construction Disturbance and Factors Influencing Vibratory Probe Compaction Effect on Liquefaction Site Treatment

作　　者：程远[1,2] 刘松玉[3] 朱合华[1] 杜广印[3] 刘学增[1] 王莎 

机构地区：[1]同济大学土木工程学院,上海200092 [2]苏州市轨道交通集团有限公司,江苏苏州215004 [3]东南大学江苏省城市地下工程与环境安全重点实验室,江苏南京210096 [4]陕西省高速公路建设集团公司,陕西西安710054

出　　处：《中国公路学报》2016年第9期38-44,52,共8页China Journal of Highway and Transport

基　　金：江苏省自然科学基金项目(BK20150279);苏州市姑苏区科技创新创业领军人才项目(姑苏人才办[2015]17号);江苏省省级高层次创新创业博士计划项目(苏人才办[2014]27号);国家自然科学基金项目(41372308)

摘　　要：采用十字形振杆密实技术进行了加固粉土地基现场试验,研究了振杆施工导致的超静孔压变化,并与采用瑞典振动翼方法的地表振动影响范围与加固效果进行比较。分析了振点间距、激振力、振杆形式等主要因素对振杆密实加固效果的影响。结果表明：反插和留振工艺对加固效果影响不大;单孔加固径向半径为1.2~2.7m;十字杆安全施工距离大于2m,优于瑞典翼;小振点间距的密实叠加效应明显;激振力适当增加可提高加固土体均匀性;十字杆上设计开口可增加与土接触、提高振幅,利于能量传递。Field tests on silty foundation reinforcement were conducted to research variation of excess pore pressure during vibration construction process by using crisscross section vibration probe compaction method. And ground influence range by vibration and reinforcement effectiveness by the method were compared with those by Swedish vibro-wing.The main factors influencing compaction effect such as space between vibration points,exciting force and style of vibratory probe were analyzed.The results show that re-driving technique and load time have little impact on compaction effect.Radial radius of foundation reinforcement for single vibration point is 1.2-2.7m.Safety distance of construction by crisscross section vibratory probe is more than 2m,which is prior to that of vibro-wing.The effect of compaction overlying at small space between vibration points is obvious.Soil uniformity can be improved by appropriately increasing exciting force.Crisscross section vibratory probe is designed with cutouts,which increasescontact with soils and amplitude improvement is beneficial for energy transfer.

关 键 词：道路工程 液化地基 振杆密实法 十字形振动杆 施工扰动 影响因素 

分 类 号：U416.1[交通运输工程—道路与铁道工程]