Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Determination of geotechnical parameters for underground trenchless construction design
https://orcid.org/0000-0002-6173-0969
Abstract The design of various components of underground trenchless constructions requires geotechnical parameters as inputs. Currently, determination of geotechnical parameters for application in the design of trenchless constructions relies heavily on the standard penetration test (SPT) and corresponding N-value. However, N-values are often misinterpreted in practices, resulting extracted geotechnical parameters poorly representing the true soil conditions. Especially among the numerous empirical methods available related to N-value, it is challenging for practitioners to find an appropriate empirical correlation for their projects. This paper summarizes ten geotechnical parameters that are often required for trenchless design, including internal friction angle, modulus of elasticity, shear modulus, undrained shear strength, modulus of soil reaction, constrained soil modulus, preconsolidation stress, overconsolidation ratio, relative density, and porosity. Empirical methods based on SPT for determining the geotechnical parameters required in trenchless design are reviewed with ninety-eight correlations between the geotechnical parameters and N-value. Furthermore, comparisons between the SPT correlations are made to provide insight on determining the geotechnical parameters. Four laboratory examples from literature sources related to the design of horizontal directional drilling (HDD) are studied to demonstrate the usefulness of the systematic determination of geotechnical parameters using SPT correlations. Compared to geotechnical parameters provided by researchers that conducted the laboratory experiments, geotechnical parameters determined using SPT correlations resulted improvement in precision by 17% for the estimation of maximum allowable annular pressure in HDD. With application of a correction factor that is commonly used among practitioners, the maximum allowable annular pressure estimated using SPT correlations are found nearly equal to the measurements of annular pressure at hydraulic fracture, confirming that SPT-based empirical methods reviewed herein are reasonably reliable for trenchless design.
Determination of geotechnical parameters for underground trenchless construction design
https://orcid.org/0000-0002-6173-0969
Abstract The design of various components of underground trenchless constructions requires geotechnical parameters as inputs. Currently, determination of geotechnical parameters for application in the design of trenchless constructions relies heavily on the standard penetration test (SPT) and corresponding N-value. However, N-values are often misinterpreted in practices, resulting extracted geotechnical parameters poorly representing the true soil conditions. Especially among the numerous empirical methods available related to N-value, it is challenging for practitioners to find an appropriate empirical correlation for their projects. This paper summarizes ten geotechnical parameters that are often required for trenchless design, including internal friction angle, modulus of elasticity, shear modulus, undrained shear strength, modulus of soil reaction, constrained soil modulus, preconsolidation stress, overconsolidation ratio, relative density, and porosity. Empirical methods based on SPT for determining the geotechnical parameters required in trenchless design are reviewed with ninety-eight correlations between the geotechnical parameters and N-value. Furthermore, comparisons between the SPT correlations are made to provide insight on determining the geotechnical parameters. Four laboratory examples from literature sources related to the design of horizontal directional drilling (HDD) are studied to demonstrate the usefulness of the systematic determination of geotechnical parameters using SPT correlations. Compared to geotechnical parameters provided by researchers that conducted the laboratory experiments, geotechnical parameters determined using SPT correlations resulted improvement in precision by 17% for the estimation of maximum allowable annular pressure in HDD. With application of a correction factor that is commonly used among practitioners, the maximum allowable annular pressure estimated using SPT correlations are found nearly equal to the measurements of annular pressure at hydraulic fracture, confirming that SPT-based empirical methods reviewed herein are reasonably reliable for trenchless design.
Determination of geotechnical parameters for underground trenchless construction design
https://orcid.org/0000-0002-6173-0969
Abstract The design of various components of underground trenchless constructions requires geotechnical parameters as inputs. Currently, determination of geotechnical parameters for application in the design of trenchless constructions relies heavily on the standard penetration test (SPT) and corresponding N-value. However, N-values are often misinterpreted in practices, resulting extracted geotechnical parameters poorly representing the true soil conditions. Especially among the numerous empirical methods available related to N-value, it is challenging for practitioners to find an appropriate empirical correlation for their projects. This paper summarizes ten geotechnical parameters that are often required for trenchless design, including internal friction angle, modulus of elasticity, shear modulus, undrained shear strength, modulus of soil reaction, constrained soil modulus, preconsolidation stress, overconsolidation ratio, relative density, and porosity. Empirical methods based on SPT for determining the geotechnical parameters required in trenchless design are reviewed with ninety-eight correlations between the geotechnical parameters and N-value. Furthermore, comparisons between the SPT correlations are made to provide insight on determining the geotechnical parameters. Four laboratory examples from literature sources related to the design of horizontal directional drilling (HDD) are studied to demonstrate the usefulness of the systematic determination of geotechnical parameters using SPT correlations. Compared to geotechnical parameters provided by researchers that conducted the laboratory experiments, geotechnical parameters determined using SPT correlations resulted improvement in precision by 17% for the estimation of maximum allowable annular pressure in HDD. With application of a correction factor that is commonly used among practitioners, the maximum allowable annular pressure estimated using SPT correlations are found nearly equal to the measurements of annular pressure at hydraulic fracture, confirming that SPT-based empirical methods reviewed herein are reasonably reliable for trenchless design.
Determination of geotechnical parameters for underground trenchless construction design
Park, Inshik (Autor:in) / Kang, Chao (Autor:in) / Bayat, Alireza (Autor:in)
2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
Determination of geotechnical parameters for underground trenchless construction design
| Springer Verlag | 2023
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