软土地段群桩基础地基系数的比例系数试验研究  

Experimental Study on Proportional Coefficient of Foundation Coefficient of Pile Group Foundation in Soft Soil Area

作　　者：虞中明 钟昌卫[2] 孙凯 宋旭明[3] YU Zhongming;ZHONG Changwei;SUN Kai;SONG Xuming(Construction Headquarters of Nanjing Railway Hub Project of China Railway Shanghai Bureau Group Co.Ltd,Nanjing 210024,China;China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中国铁路上海局集团有限公司南京铁路枢纽工程建设指挥部,南京210024 [2]中铁第四勘察设计院集团有限公司,武汉430063 [3]中南大学土木工程学院,长沙410075

出　　处：《铁道建筑》2022年第5期143-147,共5页Railway Engineering

摘　　要：为了获得软土地段群桩基础地基系数的比例系数m值,通过现场试验获取深厚软土场地承台顶位移、桩身弯矩随水平力的变化规律,并建立空间有限元模型进行分析对比。结果表明:群桩基础m随地面处位移增加呈幂函数衰减趋势,对应于地面位移6 mm,可给出群桩m值的推测值在2615~4633 kPa/m^(2),较TB 10093—2017《铁路桥涵地基和基础设计规范》取值稍小。In order to obtain the proportional coefficient m of foundation coefficient of pile group foundation in soft soil area,the field test was carried out to obtain the variation behaviors of pile top displacement and pile bending moment with horizontal force in deep soft soil area,and the spatial finite element model was established for analysis and comparison.The results show that m of pile group foundation decreases with the increase of ground displacement as a power function,corresponding to the ground displacement of 6 mm.The inferred value of m of pile group foundation can be given in the range of 2615~4633 kPa/m2,which is slightly smaller that of the TB 10093—2017 Code for Design on Subsoil and Foundation of Railway Bridge and Culvert.

关 键 词：铁路路基 地基系数的比例系数 试验研究 软土 群桩 

分 类 号：TU471.8[建筑科学—结构工程]