跨座式单轨群桩基础沉降特性研究  

Study on Settlement Characteristics of Straddle Monorail Pile Group Foundation

作　　者：康承磊 谢淼 韦楷 李林飞 任兴伟 Kang Chenglei;Xie Miao;Wei Kai;Li Linfei;Ren Xingwei(Southwest Survey and Design Group Co.,Ltd.,China Railway Siyuan Group,Kunming 650200,P.R.China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,P.R.China)

机构地区：[1]中铁四院集团西南勘察设计有限公司,昆明650200 [2]中国地质大学(武汉)工程学院,武汉430074

出　　处：《地下空间与工程学报》2021年第2期405-412,共8页Chinese Journal of Underground Space and Engineering

摘　　要：跨座式单轨交通具有造价低、爬坡能力强、车辆运行噪音低、占地少等诸多优点,也正在得到更多国家、地区的推广应用。目前跨座式单轨交通正线线路普遍采用高架桥梁的形式,虽然这样的形式有利于控制沉降和稳定结构,但是当跨座式单轨交通形式在软土地区修建时,其结构形式带来的建设成本就会变得十分巨大。本文依据拟建柳州轨道交通中高架段梁桥设计结合现有重庆轨道交通高架段结构形式,通过Adina数值模拟软件建立模型使其上部结构坐落于群桩基础上,分析其在列车运行产生动荷载作用下地基的沉降特性。在考虑了群桩基础桩长、桩基土强度、上部列车单双线等因素下,发现在运行动荷载作用下桩周土体的竖向位移随着深度的增加逐渐减小,并且随着桩长的变化,其引发的沉降相对也越小,基础也相对越稳定。在研究地基土体弹性模量变化的影响时,发现土体力学性质改良会使得群桩基础表现越来越好,在双线运行时群桩基础需要重新设计考虑荷载分布形式。The straddle type monorail transportation has many advantages such as low cost,strong climbing ability,low noise of vehicle operation and small land occupation,and is also being promoted and applied by more countries and regions. Although the viaduct-beam laying form commonly used in straddle-type traffic lines has a tendency to control settlement and stability,the cost of constructing similar traffic lines in soft soil areas will become enormous. According to the design of the proposed elevated section of Liuzhou rail transit and the existing structure of the elevated section of Chongqing rail transit,the model is built by Adina to make it sit on the pile group foundation,and the settlement characteristics under the dynamic load generated by train operation are analyzed. Considering the factors such as pile length,single and double line,and pile foundation strength,it is found that under the dynamic load of single-line train,the vertical displacement of the soil around the pile decreases with the increase of depth,and changes with the length of the pile. The settlement caused by it is relatively small,and the foundation is relatively stable. When studying the influence of the change of the elastic modulus of the foundation soil,it is found that the improvement of the mechanical properties of the soil will make the pile group foundation perform better and better. In the double-line operation,the pile group foundation needs to be redesigned to consider the load distribution form.

关 键 词：跨座式单轨 群桩基础 沉降特性 

分 类 号：U232[交通运输工程—道路与铁道工程] TU473.1[建筑科学—结构工程]