Calculation Method of Deformation Load of Deep-Buried Tunnel under Influence of Excavation Method

WANG Mingnian; WANG Zhilong; GUI Dengbin; ZHANG Xiao; ZHAO Siguang; TONG Jianjun; LIU Dagang

doi:10.3969/j.issn.0258-2724.20191124

Volume 56 Issue 5

Oct. 2021

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Journal of Southwest Jiaotong University > 2021 > 56(5): 1116-1124.

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WANG Mingnian, WANG Zhilong, GUI Dengbin, ZHANG Xiao, ZHAO Siguang, TONG Jianjun, LIU Dagang. Calculation Method of Deformation Load of Deep-Buried Tunnel under Influence of Excavation Method[J]. Journal of Southwest Jiaotong University, 2021, 56(5): 1116-1124. doi: 10.3969/j.issn.0258-2724.20191124

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Calculation Method of Deformation Load of Deep-Buried Tunnel under Influence of Excavation Method

doi: 10.3969/j.issn.0258-2724.20191124

Received Date: 26 Nov 2019
Rev Recd Date: 23 Sep 2020

Available Online: 23 Sep 2020

Publish Date: 15 Oct 2021

Abstract

Abstract

In order to study the influence of the excavation method on the deformation load of the surrounding rock, the law of its influence on the deformation load was clarified through theoretical analysis, literature research and field test methods. Considering the influence of surrounding rock grade, tunnel span and excavation method, a quantitative calculation formula for deformation load was established according to the corresponding change law based on the multiple nonlinear regression method. Through the analysis of the deformation load data of 205 monitoring sections in 54 tunnels (108 monitoring sections of large-scale excavation mechanized construction and 97 conventional partial excavation construction monitoring sections). The results show that the surrounding rock after tunnel excavation is stable and the deformation load of surrounding rock is small by adopting large-scale mechanized large-section excavation method. The deformation load of surrounding rock is large when the conventional mechanized subsection excavation method is adopted. In the calculation formula of deformation load of surrounding rock, the value of excavation method influence coefficient k_c ranges from 1.00 to 1.15, the higher the grade of surrounding rock, the greater the k_c value, that is, the worse the surrounding rock, the more obvious the influence of excavation methods on the deformation load of surrounding rock.
- excavation method,
- deep buried tunnel,
- deformation load,
- field measurement

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