Direct CPT and CPTu methods for determining bearing capacity of helical piles

Fateh, Amir; Eslami, Abolfazl; Fahimifar, Ahmad

doi:10.1080/1064119x.2015.1133741

Cited by 39 publications

(6 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Issues such as the behavior of the helical anchor and pile group [51,225], the use of HeliCAP specialized software for the design of helical members [68], the use of helical piles in offshore structures [69,70,72,75,222], and research on the lateral bearing of helical anchors and piles [62, 116, 148, 149, 157, 179, 187-189, 201, 206, 217, 221] are cases where special research has been carried out on them. Also, physical modeling of helical piles using FCV [63,95,110,186], studying on GFRP screws anchors [158], helical soil nails [163,164,169,190,200,284,294], using CPT test results to estimate the installation torque and bearing capacity of the helical piles [92,143,175,226] are other issues that have been investigated. Some research has also been carried out on the changes in configuration, materials, and grout usage to increase the bearing capacity of the helical anchors and piles [293].…”

Section: The Progress Rate Of Helical Foundationsmentioning

confidence: 99%

A review of the advancement of helical foundations from 1990- 2020 and the barriers to their expansion in developing countries

Mahmoudi-Mehrizi¹,

Ghanbari²

2021

jeg

View full text Add to dashboard Cite

The use of piles, helical anchors, in general, helical foundations has considerably increased in the last 30 years. The adoption of this technology in the international and domestic codes of each country, as well as in research and studies, and, finally, the publication of numerous books and papers in this area, and the existence of manufacturers' products, committees, and contractors of this technology has contributed to its expansion and development. However, such methods have progressed at a very slow pace in many countries, especially in developing countries. This paper attempts to assess the global advancement of the helical foundations by reviewing 292 papers from 1990 to 2020 and comparing the related research findings. This will help clarify the issue and determine the scope of technological progress. On the other hand, collecting valuable papers in this area will make it easier for researchers to make further research.Subsequently, the characteristics of this technology are highlighted and the reasons for its lack of progress in developing countries are addressed. For this purpose, a questionnaire is sent to researchers, developers, designers, and contractors of the geotechnical projects. The purpose of this questionnaire is to specify the type of existing projects, the soil type of project site, the degree of familiarity with the helical foundation technology, the reasons for not using this method, and the solutions available to expand and develop this method. Finally, there are suggestions to develop this approach and the issues that need further research.

show abstract

Section: The Progress Rate Of Helical Foundationsmentioning

confidence: 99%

A review of the advancement of helical foundations from 1990- 2020 and the barriers to their expansion in developing countries

Mahmoudi-Mehrizi¹,

Ghanbari²

2021

jeg

View full text Add to dashboard Cite

show abstract

“…In general, the static load test is a costly and has a delayed prediction method. The prediction of the ultimate bearing capacity of monopiles based on the load tests of CPT and CPTU is a simple and fast prediction method [35][36][37][38]. Two parameters, cone tip resistance and sidewall resistance, are obtained from the CPT tests, which can be used to classify the soil layers and estimate the strength and deformation characteristics of the soil at different depths to provide data support for the ultimate load capacity prediction.…”

Section: Introductionmentioning

confidence: 99%

Prediction Method of Vertical Ultimate Compressive Bearing Capacity of Single Pile in Soft Soil considering the Influence of Gravity

et al. 2023

View full text Add to dashboard Cite

Considering that the pile foundation is widely used in soft soil, in order to improve the prediction accuracy of the vertical ultimate compressive bearing capacity of a single pile, this paper puts forward a calculation model of the pile side friction resistance in homogeneous soil based on the previous research and further deduces the calculation method of pile body internal force in layered soil under the influence of gravity field. In this research, the transmission of load along the pile body is related to the previous research on the ultimate end resistance, and an analytical calculation for the vertical ultimate compressive capacity of a single pile is proposed. The novelty of the method is that the ultimate bearing capacity is solved from the perspective of force transfer while considering its own gravity, making the results more accurate. In order to verify the reliability of the method, four engineering test piles in the soft soil area of Suzhou, China, were selected, and it is indicated that the results of the static load test and finite element simulation are consistent with the proposed method, proving that the method proposed in this paper for predicting the vertical ultimate compressive bearing capacity of single pile in soft soil area has an excellent effect.

show abstract

“…As an in-situ testing technique, Cone Penetration Test (CPT) is widely used in geotechnical engineerings, such as soil classification (Cai et al 2011;Librić et al 2017;Cetin and Ozan 2009;Robertson 2016;Jefferies and Davies 1991), soil liquefaction judgment (Robertson and Campanella 1985;Maurer et al 2015;Stark and Olson 1995;Ku et al 2004), and analysis of bearing capacity (Cai et al 2009;Ghorbani et al 2018;Fateh et al 2017).…”

Section: Introductionmentioning

confidence: 99%

An integrated machine learning model for soil category classification based on CPT

Bai,

Shen,

Zhang

2023

Preprint

View full text Add to dashboard Cite

Soil classification is a critical issue in geological engineering, with the Cone Penetration Test (CPT) being an effective in-situ testing technique to record the variation of soil characteristics. Despite many studies that have been conducted on the relationship between CPT parameters and soil categories, analyzing soil in specific areas is essential due to the high uncertainty of geotechnical. In this study, we analyzed CPT parameters and soil categories based on geological soil layers in the Shanghai region. The CPT-based indirect method requires additional geotechnical parameters, which are limited due to the lack of advanced equipment to measure pore pressure in China. To satisfy practical application requirements, we proposed a new CPT-based direct method based on an integrated machine-learning model. By establishing multiple classification models and using Particle Swarm Optimization (PSO) to determine each model's weights, the results of multiple models were integrated to improve classification accuracy and robustness. The experimental results show that the integrated model has high accuracy and robustness in multiple engineering sites, with significant advantages over conventional CPT-based direct methods.

show abstract

Direct CPT and CPTu methods for determining bearing capacity of helical piles

Cited by 39 publications

References 30 publications

A review of the advancement of helical foundations from 1990- 2020 and the barriers to their expansion in developing countries

A review of the advancement of helical foundations from 1990- 2020 and the barriers to their expansion in developing countries

Prediction Method of Vertical Ultimate Compressive Bearing Capacity of Single Pile in Soft Soil considering the Influence of Gravity

An integrated machine learning model for soil category classification based on CPT

Contact Info

Product

Resources

About