Peck Formula Modification of and Engineering Application in Small Radius Curve Shield Tunneling Construction
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 4
Abstract
Objective In the urban rail transit line planning, curved tunnels, and even small radius curved tunnels are often chosen due to influencing factors such as building foundations, underground pipelines, and weak soil layers. Compared to straight tunnels, the shield tunneling construction in small radius curved tunnels increases uncontrolled land subsidence risk. Therefore, it is necessary to study land subsidence control in shield tunneling construction on small radius curved tunnels. Method By calculating the over-excavation gap during curved tunnel shield tunneling construction, the over-excavation quantity for each ring within the curved section is derived. Furthermore, the relationship between tunnel radius and formation loss rate is obtained by introducing formation loss rate. Based on the applicability statistical analysis of existing Peck formula, a modified Peck formula suitable for shield tunneling construction in small radius curved tunnels is derived considering the base formation loss rate, total formation loss rate, additional formation loss rate due to over-excavation, and the calculation of settlement volume slices. Using an engineering of a metro line in Taiyuan as research background, the results of the modified Peck formula calculation are compared with the on-site monitoring data to validate its applicability. Result & Conclusion The verification results from the case study demonstrate that the modified Peck formula is applicable for shield tunneling construction on small radius curved tunnels.
Authors and Affiliations
Linghang YANG
Keywords
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- EP ID EP734154
- DOI 10.16037/j.1007-869x.2024.04.008
- Views 38
- Downloads 0
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