中南大学学报（自然科学版）2024，Vol.55Issue(4)：1447-1462,16.DOI:10.11817/j.issn.1672-7207.2024.04.017
饱和土地区不同直径盾构穿越既有隧道的理论研究
Theoretical research on shield tunnels with different diameters crossing through existing tunnels in saturated soil area
摘要
Abstract
With the diversified development of spatial sections of urban subway tunnel,existing tunnels inevitably face the huge risk of shield tunnel crossing with different diameters.Based on the initial value solution of semi-infinite saturated soil,considering the diameter and type of shield machine,the corrected calculation methods for the additional thrust on the shield excavation face,the friction of shield shell,the grouting pressure of the shield tail and other construction factors were given.The calculation formula of the vertical deformation of the existing tunnel caused by shield tunnel crossing with different diameters in saturated soft soil area was deduced.The results show that compared with previous calculation methods in the literature,the proposed calculation method is more advantageous in predicting the deformation of the existing tunnel caused by the crossing of the large-diameter shield in saturated soil.When the shield tunnel obliquely passes through the existing tunnel,the longitudinal settlement tank will be skewed,and the deformation of the existing tunnel tends to be stable after the shield leaves the tunnel axis by 4.5 times the length of shield machine.The difference in the stability principle of the excavation face of different types of shield machines is the key factor affecting the calculation results.The additional thrust on the shield excavation face considering the mud weight distribution is more sensitive to the change of the shield diameter than that in the consideration of squeezing effect.关键词
盾构隧道/饱和土/盾构穿越/大直径/开挖面Key words
shield tunnel/saturated soil/shield crossing/large diameters/excavation face分类
交通工程引用本文复制引用
丁智,张默爆,张霄,魏新江,申文明,周俊宏..饱和土地区不同直径盾构穿越既有隧道的理论研究[J].中南大学学报（自然科学版）,2024,55(4):1447-1462,16.基金项目
浙江省"尖兵""领雁"研发攻关计划项目(2023C03182) （2023C03182）
国家自然科学基金资助项目(52178400,52278418) （52178400,52278418）
浙江省自然科学基金重点资助项目(LHZ20E080001) （LHZ20E080001）
浙江省重点研发计划项目(2020C01102)(Project(2023C03182)supported by Key Research and Development Program of Zhejiang Province （2020C01102）
Projects(52178400,52278418)supported by the National Natural Science Foundation of China （52178400,52278418）
Project(LHZ20E080001)supported by the Key Project of Zhejiang Provincial Natural Science Foundation （LHZ20E080001）
Project(2020C01102)supported by the Zhejiang Provincial Key Research and Development Program) （2020C01102）
