The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Ali Namaei - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of the Pullout Resistance of Soil Nails in Tehran Alluvium by Considering the Overburden Pressure Effect
Geotechnical and Geological Engineering, 2019Co-Authors: Reza Ziaie Moayed, Ali NamaeiAbstract:The present study evaluates the pullout and bond resistance of soil nails by considering the Overburden Pressure effect in Tehran alluvium consisted of four units depending on the deposition age. In order to investigate the pullout resistance, a series of 42 in situ pullout tests are performed in unit A, B and C contained coarse grained soils and clayey soils chosen from unit D of Tehran alluvium. Moreover, a one-way analysis of variance has been conducted to evaluate the proportion of soil and Overburden Pressure effect on the pullout resistance. The obtained results were compared with a conventional code (FHWA-NHI-14-007) criterion and it was concluded that the SPT base pullout resistance is more conservative method for evaluating soil nail pullout resistance. The results indicate that the bond resistance of soil nails increases as the Overburden Pressure increases in coarse grained soil, but the Overburden Pressure does not have a significant effect on the bond resistance in clayey soil. It seems that the Overburden Pressure effect is mobilized by inter granular stress transmission. Furthermore, it was found that the soil nail bond resistance is depended on the construction quality. As the quality of construction reduces, the bond strength decreases. The construction quality is highly affected the soil nails nearby the excavation ground surface where the Overburden Pressure does not have a significant influence on the pullout capacity.
Reza Ziaie Moayed - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of the Pullout Resistance of Soil Nails in Tehran Alluvium by Considering the Overburden Pressure Effect
Geotechnical and Geological Engineering, 2019Co-Authors: Reza Ziaie Moayed, Ali NamaeiAbstract:The present study evaluates the pullout and bond resistance of soil nails by considering the Overburden Pressure effect in Tehran alluvium consisted of four units depending on the deposition age. In order to investigate the pullout resistance, a series of 42 in situ pullout tests are performed in unit A, B and C contained coarse grained soils and clayey soils chosen from unit D of Tehran alluvium. Moreover, a one-way analysis of variance has been conducted to evaluate the proportion of soil and Overburden Pressure effect on the pullout resistance. The obtained results were compared with a conventional code (FHWA-NHI-14-007) criterion and it was concluded that the SPT base pullout resistance is more conservative method for evaluating soil nail pullout resistance. The results indicate that the bond resistance of soil nails increases as the Overburden Pressure increases in coarse grained soil, but the Overburden Pressure does not have a significant effect on the bond resistance in clayey soil. It seems that the Overburden Pressure effect is mobilized by inter granular stress transmission. Furthermore, it was found that the soil nail bond resistance is depended on the construction quality. As the quality of construction reduces, the bond strength decreases. The construction quality is highly affected the soil nails nearby the excavation ground surface where the Overburden Pressure does not have a significant influence on the pullout capacity.
S L Chiu - One of the best experts on this subject based on the ideXlab platform.
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influence of Overburden Pressure on soil nail pullout resistance in a compacted fill
Journal of Geotechnical and Geoenvironmental Engineering, 2008Co-Authors: Lijun Su, Terence C F Chan, Y K Shiu, S L ChiuAbstract:Soil nailing has been widely used in many places in the world in the last two decades because of its technical and economical advantages. The nail–soil interface shear strength is an important parameter in soil nail design. This parameter is governed by a number of factors, among which the influence of the Overburden Pressure (or soil depth) is the most controversial. There are differing views concerning the effect of Overburden on the nail–soil interface shear strength. In order to examine the influence of the Overburden Pressure, a series of laboratory pullout tests on soil nails installed in compacted completely decomposed granite fill have been conducted using two pullout boxes. Numerical simulations have also been carried out and the results are compared with the pullout test data. The procedures of the pullout tests and new features of the pullout boxes used are briefly described. Changes of the vertical stress in soil close to the nail throughout the course of soil nail installation and pullout are...
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Influence of Overburden Pressure on Soil — Nail Pullout Resistance in a Compacted Fill
Journal of Geotechnical and Geoenvironmental Engineering, 2008Co-Authors: Terence C F Chan, Y K Shiu, Jian-hua Yin, S L ChiuAbstract:Soil nailing has been widely used in many places in the world in the last two decades because of its technical and economical advantages. The nail–soil interface shear strength is an important parameter in soil nail design. This parameter is governed by a number of factors, among which the influence of the Overburden Pressure (or soil depth) is the most controversial. There are differing views concerning the effect of Overburden on the nail–soil interface shear strength. In order to examine the influence of the Overburden Pressure, a series of laboratory pullout tests on soil nails installed in compacted completely decomposed granite fill have been conducted using two pullout boxes. Numerical simulations have also been carried out and the results are compared with the pullout test data. The procedures of the pullout tests and new features of the pullout boxes used are briefly described. Changes of the vertical stress in soil close to the nail throughout the course of soil nail installation and pullout are...
Lijun Su - One of the best experts on this subject based on the ideXlab platform.
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influences of Overburden Pressure and soil dilation on soil nail pull out resistance
Computers and Geotechnics, 2010Co-Authors: Lijun Su, Wanhuan ZhouAbstract:Abstract Soil nailing is the most popular technique for stabilizing newly formed and existing sub-standard slopes in Hong Kong because of its economic and technical advantages. The nail–soil interface shear resistance is an important parameter in design of soil nailed structures. A three-dimensional finite element model was established and used for simulating soil nail pull-out tests. The finite element model was verified by comparing simulated results with measured data. The agreement between the experimental and simulated results in terms of both average pull-out shear stress and stress variation was very good. Using this finite element model, a parametric study was carried out to study the influences of the Overburden Pressure and soil dilation angle on the soil nail pull-out resistance. The simulated peak pull-out resistance was not directly related to the Overburden Pressure, which was coincident with the observations in laboratory pull-out tests. The simulated pull-out resistance increased significantly with the increase in dilation angle of the shearing zone. This analysis indicated that the constrained dilatancy of the nail–soil interface and the soil surrounding the nail contributed a lot to the development of peak pull-out resistance.
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influence of Overburden Pressure on soil nail pullout resistance in a compacted fill
Journal of Geotechnical and Geoenvironmental Engineering, 2008Co-Authors: Lijun Su, Terence C F Chan, Y K Shiu, S L ChiuAbstract:Soil nailing has been widely used in many places in the world in the last two decades because of its technical and economical advantages. The nail–soil interface shear strength is an important parameter in soil nail design. This parameter is governed by a number of factors, among which the influence of the Overburden Pressure (or soil depth) is the most controversial. There are differing views concerning the effect of Overburden on the nail–soil interface shear strength. In order to examine the influence of the Overburden Pressure, a series of laboratory pullout tests on soil nails installed in compacted completely decomposed granite fill have been conducted using two pullout boxes. Numerical simulations have also been carried out and the results are compared with the pullout test data. The procedures of the pullout tests and new features of the pullout boxes used are briefly described. Changes of the vertical stress in soil close to the nail throughout the course of soil nail installation and pullout are...
Terence C F Chan - One of the best experts on this subject based on the ideXlab platform.
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influence of Overburden Pressure on soil nail pullout resistance in a compacted fill
Journal of Geotechnical and Geoenvironmental Engineering, 2008Co-Authors: Lijun Su, Terence C F Chan, Y K Shiu, S L ChiuAbstract:Soil nailing has been widely used in many places in the world in the last two decades because of its technical and economical advantages. The nail–soil interface shear strength is an important parameter in soil nail design. This parameter is governed by a number of factors, among which the influence of the Overburden Pressure (or soil depth) is the most controversial. There are differing views concerning the effect of Overburden on the nail–soil interface shear strength. In order to examine the influence of the Overburden Pressure, a series of laboratory pullout tests on soil nails installed in compacted completely decomposed granite fill have been conducted using two pullout boxes. Numerical simulations have also been carried out and the results are compared with the pullout test data. The procedures of the pullout tests and new features of the pullout boxes used are briefly described. Changes of the vertical stress in soil close to the nail throughout the course of soil nail installation and pullout are...
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Influence of Overburden Pressure on Soil — Nail Pullout Resistance in a Compacted Fill
Journal of Geotechnical and Geoenvironmental Engineering, 2008Co-Authors: Terence C F Chan, Y K Shiu, Jian-hua Yin, S L ChiuAbstract:Soil nailing has been widely used in many places in the world in the last two decades because of its technical and economical advantages. The nail–soil interface shear strength is an important parameter in soil nail design. This parameter is governed by a number of factors, among which the influence of the Overburden Pressure (or soil depth) is the most controversial. There are differing views concerning the effect of Overburden on the nail–soil interface shear strength. In order to examine the influence of the Overburden Pressure, a series of laboratory pullout tests on soil nails installed in compacted completely decomposed granite fill have been conducted using two pullout boxes. Numerical simulations have also been carried out and the results are compared with the pullout test data. The procedures of the pullout tests and new features of the pullout boxes used are briefly described. Changes of the vertical stress in soil close to the nail throughout the course of soil nail installation and pullout are...
