Comparative Model Tests of SDP and CFA Pile Groups in Non-Cohesive Soil

Krasiński, Adam; Kusio, Tomasz

doi:10.2478/sgem-2014-0031

Cited by 7 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Preliminary tests have shown that in the case of pile groups, where the loads on pile heads can act eccentrically, single gauge sensor readings do not lead to correct results (Krasiński and Kusio [4]). To avoid errors in measurement, two types of sensors were prepared.…”

Section: The Construction Of Sensorsmentioning

confidence: 99%

See 1 more Smart Citation

Pile Model Tests Using Strain Gauge Technology

Krasiński

Kusio

2015

Studia Geotechnica Et Mechanica

Self Cite

View full text Add to dashboard Cite

Ordinary pile bearing capacity tests are usually carried out to determine the relationship between load and displacement of pile head. The measurement system required in such tests consists of force transducer and three or four displacement gauges. The whole system is installed at the pile head above the ground level. This approach, however, does not give us complete information about the pile-soil interaction. We can only determine the total bearing capacity of the pile, without the knowledge of its distribution into the shaft and base resistances. Much more information can be obtained by carrying out a test of instrumented pile equipped with a system for measuring the distribution of axial force along its core. In the case of pile model tests the use of such measurement is difficult due to small scale of the model. To find a suitable solution for axial force measurement, which could be applied to small scale model piles, we had to take into account the following requirements: - a linear and stable relationship between measured and physical values, - the force measurement accuracy of about 0.1 kN, - the range of measured forces up to 30 kN, - resistance of measuring gauges against aggressive counteraction of concrete mortar and against moisture, - insensitivity to pile bending, - economical factor. These requirements can be fulfilled by strain gauge sensors if an appropriate methodology is used for test preparation (Hoffmann [1]). In this paper, we focus on some aspects of the application of strain gauge sensors for model pile tests. The efficiency of the method is proved on the examples of static load tests carried out on SDP model piles acting as single piles and in a group.

show abstract

Section: The Construction Of Sensorsmentioning

confidence: 99%

“…The procedures of soil preparation, model piles installation, construction of foundations and loading tests were described in our previous paper (Krasiński and Kusio [4]).…”

Section: Examples Of Applicationmentioning

confidence: 99%

Pile Model Tests Using Strain Gauge Technology

Krasiński

Kusio

2015

Studia Geotechnica Et Mechanica

Self Cite

View full text Add to dashboard Cite

show abstract

“…In terms of model tests, Krasiński and Kusio [14] carried out model tests on group piles and single piles of screw displacement piles (SDPs) and CFA piles and discovered that the load-settlement characteristics were not significantly different in high-density sand. Liu et al [15] examined the differences in the bearing mechanism between SDS piles and CFA piles through sand foundation model tests.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Model Study on the Pile‐Forming Mechanisms and Bearing Deformation Characteristics of CFA Piles

Zhu

Liu

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

To study the pile-forming mechanism and bearing deformation characteristics of continuous flight auger (CFA) piles, a series of procedures, including helical drilling, pulling up/grouting, and inserting cage/pile forming, were simulated in clay-sand double-layer foundations by a homemade model drilling machine system in laboratory model tests. The effects of two different pile-forming methods on the load transfer and bearing characteristics of the piles were investigated by performing a model test comparison of CFA piles and bored piles. The experimental results show that there exist a soil improvement effect around the pile and a diameter expansion effect during the drilling process and grouting process for the CFA pile, which can effectively improve the lateral friction resistance of the pile. Compared with the bored pile, the pile diameter in the middle of the CFA pile increased by 19%, and the total lateral friction resistance of the CFA pile increased by 9.1% at a high load (1500 N). The comparative results of the model tests show that the bearing capacity of a single CFA pile increased by 50.0% and that the total settlement decreased by 40.5%. The results of the in situ test piles show that the load-settlement curves of the two pile types are similar under low-medium loads and that the lateral friction resistance of the CFA pile under high loads is better developed, which is relatively consistent with the model test results.

show abstract

“…General aspects of ground resistance and PG deformation were analyzed by Adejumo (2013), Broms (1981), Mandolini and Viggiani (1997), Poulos (1968), Randolph (2003) and Vesic (1975). Experimental investigation results were presented by Al-Mhaidib (2006), Kishida (1964), Krasinski and Kusio (2014), McCabe and Lehane (2006), Randolph, Dolwin, and Beck (1994), Sales, Prez-zi, Salgado, Choi, and Lee (2017), Tejchman (1973), Tuan (2016), Vesic (1967Vesic ( , 1968, Q.-q. Zhang, S.-m. Zhang, Liang, Q. Zhang, and Xu (2015).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Bearing Resistance of Short Displacement Pile Groups in Dense Sands

Norkus

Martinkus

2019

Journal of Civil Engineering and Management

View full text Add to dashboard Cite

The prediction of the behavior of structures interacting with soil is one of the main challenges in structural design. Accurate evaluation of soil–structure interaction ensures a rational design solution for the superstructure and foundation of a building. In structural analysis, one of the key problems is the identification of relevant movements of the foundation considering the interaction between the superstructure, foundation and ground (the soil mass around the foundation). The correct assessment of soil–structure interaction contributes to the rational constructional design of the superstructure and foundation and allows avoiding violations of requirements for ultimate and serviceability limit states possible due to unpredicted additional stress on the structural system. Resistance predictions for pile group foundations is a complex problem, which may be the reason for scattered and insufficient information available despite numerous experimental and numerical studies, predominated by the focus on partial empirical relationships. This experimental study analyzed the prototype of a short displacement pile group with a flexible pile cap in terms of the bearing capacity and deformation behavior while subjected to static axial vertical load. In particular, attention was given to the resistance–stiffness evolution of single piles acting in a pile group with different spacing. Test results of short displacement pile groups were used to verify known models for the bearing resistance prediction of the pile group.

show abstract

Comparative Model Tests of SDP and CFA Pile Groups in Non-Cohesive Soil

Cited by 7 publications

References 1 publication

Pile Model Tests Using Strain Gauge Technology

Pile Model Tests Using Strain Gauge Technology

Laboratory Model Study on the Pile‐Forming Mechanisms and Bearing Deformation Characteristics of CFA Piles

Experimental Study on Bearing Resistance of Short Displacement Pile Groups in Dense Sands

Contact Info

Product

Resources

About