摘要
地铁车站附属工程高程爬升段受施工工期、地面空间不足、既有接驳等条件制约需采用仰挖法施工。通过数据统计分析仰挖施工沉降规律及影响因素,并通过实际案例进行仰挖与俯挖实测分析和数值分析对比研究探索沉降规律。研究表明:①拱部为砂性土时,87.3%的测点沉降量在3~60 mm之间,拱部为黏性土时,59.2%的测点沉降量在3~30 mm,拱部为卵石层时,测点分布离散;②关于沉降槽宽度,黏性土≈砂性土>卵石,黏性土与砂性土沉降槽宽度约为出入口或通道宽度的3倍,卵石沉降槽宽度与出入口或通道宽度相近;③仰挖施工最大沉降量比俯挖施工多大约75%,仰挖施工最大沉降发生于爬坡段约1/2处,而俯挖施工最大沉降更接近于埋深最小处。研究结论可用于初步判断仰挖施工沉降量范围、沉降控制最不利部位。
The down-top excavation method is used for the elevation climbing section of the metro station ancillary project owing to the restricted construction duration,lack of ground space,existing connection,and other conditions.Through the statistical analysis of the down-top excavation construction settlement rule and influencing factors,the settlement law was explored by comparing the measured and numerical analyses of the down-top and dig-down excavation cases.The results show that:1)When the arch is sandy soil,87.3%of the measurement point settlement amount is between 3 and 60 mm,and when the arch is clay soil,59.2%of the measurement point settlement is between 3 and 30 mm.Moreover,when the arch is a pebble layer,the measurement point distribution is dispersed.2)The arch underlines the relationship between the amount of sedimentation and buried depth when clay and sandy soil are used.The relationship is linearly proportional when the arch is a pebble.3)The maximum settlement of the down-top excavation construction is approximately 75%of the dig-down construction,and it occurs in approximately 1/2 of the climbing section.Moreover,the maximum settlement of the dig-down construction is closer to the lowest depth.The conclusions of this study can be used to make a preliminary assessment on the range of subsidence and the most unfavorable part of settlement control.
作者
叶新丰
陈博
郭鑫
梁海英
俞响
YE Xinfeng;CHEN Bo;GUO Xin;LIANG Haiying;YU Xiang(Beijing MTR Construction Administration Corporation,Beijing 100037;Key Laboratory of Fully Automatic Operation and Safety Monitoring for Urban Rail Transit,Beijing 100068;China Railway Fifth Survey and Design Institute Group Co.,Ltd.,Beijing 102600;Beijing Rail and Transit Design and Research Institute Co.,Ltd.,Beijing 100068)
出处
《都市快轨交通》
北大核心
2023年第2期167-173,共7页
Urban Rapid Rail Transit
基金
企业双创基金(SCJJ2021005)。
关键词
轨道交通
隧道
仰挖施工
俯挖施工
地表沉降
数值分析
rail transit
tunnel
down-top excavation
dig-down construction
surface subsidence
numerical simulation
作者简介
第一作者:叶新丰,男,硕士,高级工程师,从事轨道交通施工风险控制的研究,yexf2000@163.com。
