Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Numerical Simulation-Based Performance Assessment of Pile Group Placed over Buried Utility Tunnel
https://orcid.org/http://orcid.org/0000-0002-2547-8786
With expanding urban and infrastructure development, when everything is going underground in the form of buried conduit and utility tunnel, a possibility exists when the foundation of a structure is placed near the existing buried conduit or utility tunnel. The ultimate load carrying capacity of such foundation sub-system is influenced and requires a revised estimation of ultimate load carrying capacity with due consideration of presence of such buried conduit or utility tunnel. This is a complex soil–structure–buried pipe interaction problem. Furthermore, problem gets complicated while taking into account the uncertainty involved in the estimation of geotechnical parameters, due to inherent soil variability, testing error and model transformation. Conventionally, a factor of safety in the range of 2.5–3.0 is applied on the ultimate load capacity. The choice of factor of safety is qualitative in nature and depends on the experience, knowledge and confidence level of the designer. On the other hand, probabilistic approach counts on the mathematical modeling and procedure to treat input geotechnical parameters and corresponding output response as random variables and bring rationality in the analysis and decision-making on the choice of factor of safety. The present study demonstrates the same by considering a problem statement where a pile group is placed above the existing buried conduit or utility tunnel. To establish an explicit functional relationship between input geotechnical parameters and output response, i.e., factor of safety, concept of response surface method (RSM) is used in conjunction with the 3D finite element-based numerical code ABAQUS FEA. Reliability analysis of the pile group foundation placed above the buried conduit or utility tunnel is performed using first-order second moment (FOSM) approach as well as point estimate method (PEM), and results are reported in terms of an index known as reliability index β. From the results of the analysis, it is demonstrated that in a given extent of uncertainty in the geotechnical parameter, a factor of safety of 3.8, which is considered to be sufficient in the pile foundation design, will ensure only “above average” performance. For “excellent” or “very good” performance, a higher value of factor of safety will be required.
Numerical Simulation-Based Performance Assessment of Pile Group Placed over Buried Utility Tunnel
https://orcid.org/http://orcid.org/0000-0002-2547-8786
With expanding urban and infrastructure development, when everything is going underground in the form of buried conduit and utility tunnel, a possibility exists when the foundation of a structure is placed near the existing buried conduit or utility tunnel. The ultimate load carrying capacity of such foundation sub-system is influenced and requires a revised estimation of ultimate load carrying capacity with due consideration of presence of such buried conduit or utility tunnel. This is a complex soil–structure–buried pipe interaction problem. Furthermore, problem gets complicated while taking into account the uncertainty involved in the estimation of geotechnical parameters, due to inherent soil variability, testing error and model transformation. Conventionally, a factor of safety in the range of 2.5–3.0 is applied on the ultimate load capacity. The choice of factor of safety is qualitative in nature and depends on the experience, knowledge and confidence level of the designer. On the other hand, probabilistic approach counts on the mathematical modeling and procedure to treat input geotechnical parameters and corresponding output response as random variables and bring rationality in the analysis and decision-making on the choice of factor of safety. The present study demonstrates the same by considering a problem statement where a pile group is placed above the existing buried conduit or utility tunnel. To establish an explicit functional relationship between input geotechnical parameters and output response, i.e., factor of safety, concept of response surface method (RSM) is used in conjunction with the 3D finite element-based numerical code ABAQUS FEA. Reliability analysis of the pile group foundation placed above the buried conduit or utility tunnel is performed using first-order second moment (FOSM) approach as well as point estimate method (PEM), and results are reported in terms of an index known as reliability index β. From the results of the analysis, it is demonstrated that in a given extent of uncertainty in the geotechnical parameter, a factor of safety of 3.8, which is considered to be sufficient in the pile foundation design, will ensure only “above average” performance. For “excellent” or “very good” performance, a higher value of factor of safety will be required.
Numerical Simulation-Based Performance Assessment of Pile Group Placed over Buried Utility Tunnel
https://orcid.org/http://orcid.org/0000-0002-2547-8786
With expanding urban and infrastructure development, when everything is going underground in the form of buried conduit and utility tunnel, a possibility exists when the foundation of a structure is placed near the existing buried conduit or utility tunnel. The ultimate load carrying capacity of such foundation sub-system is influenced and requires a revised estimation of ultimate load carrying capacity with due consideration of presence of such buried conduit or utility tunnel. This is a complex soil–structure–buried pipe interaction problem. Furthermore, problem gets complicated while taking into account the uncertainty involved in the estimation of geotechnical parameters, due to inherent soil variability, testing error and model transformation. Conventionally, a factor of safety in the range of 2.5–3.0 is applied on the ultimate load capacity. The choice of factor of safety is qualitative in nature and depends on the experience, knowledge and confidence level of the designer. On the other hand, probabilistic approach counts on the mathematical modeling and procedure to treat input geotechnical parameters and corresponding output response as random variables and bring rationality in the analysis and decision-making on the choice of factor of safety. The present study demonstrates the same by considering a problem statement where a pile group is placed above the existing buried conduit or utility tunnel. To establish an explicit functional relationship between input geotechnical parameters and output response, i.e., factor of safety, concept of response surface method (RSM) is used in conjunction with the 3D finite element-based numerical code ABAQUS FEA. Reliability analysis of the pile group foundation placed above the buried conduit or utility tunnel is performed using first-order second moment (FOSM) approach as well as point estimate method (PEM), and results are reported in terms of an index known as reliability index β. From the results of the analysis, it is demonstrated that in a given extent of uncertainty in the geotechnical parameter, a factor of safety of 3.8, which is considered to be sufficient in the pile foundation design, will ensure only “above average” performance. For “excellent” or “very good” performance, a higher value of factor of safety will be required.
Numerical Simulation-Based Performance Assessment of Pile Group Placed over Buried Utility Tunnel
Iran J Sci Technol Trans Civ Eng
Srivastava, Amit (Autor:in) / Kothari, Shashank (Autor:in) / Jawaid, Sajjaf (Autor:in)
01.08.2024
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Numerical Simulation-Based Performance Assessment of Pile Group Placed over Buried Utility Tunnel
| Springer Verlag | 2024
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