粉细砂地层大直径泥水盾构掘进控制分析  

Research on the Control of Driving Parameters of Large-Diameter Slurry Shield Through the Fine Sand Stratum

作　　者：舒计城 SHU Jicheng(China Railway 14th Bureau Corporation Mega Shield Construction Engineering Co.Ltd.,Nanjing Jiangsu 211800,China)

机构地区：[1]中铁十四局集团大盾构工程有限公司,江苏南京211800

出　　处：《铁道建筑技术》2024年第12期182-185,198,共5页Railway Construction Technology

基　　金：国家重点研发计划项目(2022YFC3802300)。

摘　　要：由于粉细砂地层具有承载力低、渗透系数大、自稳能力差等特点,因此大直径盾构掘进施工参数设置至关重要。结合武汉交通轨道12号线科普公园至丹水池区间越江隧道工程,探讨盾构机在粉细砂地层掘进时参数控制措施。结果表明:(1)依据现场监测数据,盾构推力和贯入度与掘进速度呈正相关,切口压力与掘进速度呈负相关;(2)对盾构施工过程进行数值分析,并将沉降模拟值与实测值进行对比,以验证模型的有效性;(3)盾构掘进过程中,距离开挖面30 m范围内土体会产生沉降,且距离开挖面越近,沉降速率越大,最大沉降速率出现在距开挖面0~15 m范围;(4)模拟不同支护压力下地层沉降,在粉细砂地层中,通过增加支护压力可有效减少地表沉降量,增强开挖土体的稳定性。Since the silty fine sand formation has the characteristics of low bearing capacity,large permeability coefficient,and poor self-stabilization ability,the setting of construction parameters for large-diameter shield tunneling is crucial.This article explores the parameter control of shield tunneling machines during excavation in fine sand formations,based on the river-crossing tunnel project between Wuhan Metro Line 12 Science Park and Danshuichi.The results showed that:(1)based on on-site monitoring data,it was found that the thrust and penetration of shield tunneling were positively correlated with excavation speed,while the incision pressure was negatively correlated with excavation speed;(2)numerical analysis was used to analyze the shield tunneling construction process,and the settlement simulation values were compared with the measured values to verify the effectiveness of the model;(3)during shield tunneling,the soil within a range of 30 meters away from the excavation face will experience settlement,the closer it is to the excavation surface,the greater the settlement rate,and the maximum settlement rate occurs at a distance of 0-15 m from the excavation surface;(4)the settlement of strata under different support pressures was simulated in the fine sand layer,increasing the support pressure can effectively reduce surface settlement and enhance the stability of excavated soil.

关 键 词：大直径盾构 粉细砂层 数值分析 掘进参数 地层沉降 

分 类 号：U455.3[建筑科学—桥梁与隧道工程]