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Effect of transient coupled hydro-mechanical response on the longitudinal displacement profile of deep tunnels in saturated ground
Prassetyo S.H.a, Gutierrez M.b
a Mining Engineering Program, Institut Teknologi Bandung, Bandung, 40132, Indonesia
b Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, 80401, United States
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2018 Elsevier LtdAn advancing tunnel in deep saturated ground induces coupled interactions between transient fluid flow and deformation that affect the hydro-mechanical (H-M) response of the ground surrounding the excavation. The use of the convergence-confinement method (CCM) to simplify this three-dimensional (3-D) coupled problem into a 2-D plane strain model must then account for this transient coupling effect. Similarly, the induced radial displacement of the tunnel, commonly represented as the longitudinal displacement profile (LDP), will also be influenced by this time-dependent coupled interaction. This study investigates the effect of the transient H-M interaction on the practical implementation of the CCM and the LDP of an advancing tunnel in deep saturated ground. The tunnel is represented by a 2-D axisymmetric coupled H-M model that is built into the computer program Fast Lagrangian Analysis of Continua (FLAC) and is subjected to an isotropic in situ stress field. First, the study analyzes the induced pore pressure and deformation behavior during the excavation and standstill periods. Second, to account for the transient coupling effect, this study proposes: (1) nonlinear unloading factors for estimating excavation-induced pore pressure changes in CCM and (2) new LDP equations for predicting transient radial displacements along the axis of the tunnel. The resulting relationships from the two propositions are normalized, and thus, they should be applicable to other tunnel depths as well.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Convergence-confinement method,Coupling effect,Hydro-mechanical interactions,Longitudinal displacements,Nonlinear unloading factor[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Convergence-confinement method,Deep advancing tunnel,Hydro-mechanical interaction,Longitudinal displacement profile,Nonlinear unloading factor,Transient coupling effect[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]The authors gratefully acknowledge support from the United States Department of Transportation (U.S. DOT) through the University Transportation Center for Underground Transportation Infrastructure (UTC-UTI) at Colorado School of Mines for partially funding this research under Grant No. 69A3551747118. The opinions expressed in this paper are those of the authors and not of the U.S. DOT.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1016/j.tust.2018.02.003[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]