dc.contributor.author |
Kaushalya, AAS |
|
dc.contributor.author |
Nawagamuwa, UP |
|
dc.contributor.editor |
Hettiarachchi, P |
|
dc.date.accessioned |
2022-05-07T09:41:50Z |
|
dc.date.available |
2022-05-07T09:41:50Z |
|
dc.date.issued |
2021-11 |
|
dc.identifier.citation |
Kaushalya, A.A.S., & Nawagamuwa, U.P. (2021). Development of an alternative approach for bored and cast in-situ pile design using PDA test results [Abstract]. In P. Hettiarachchi (Ed.), Proceedings of Civil Engineering Research Symposium 2021 (p. 30). Department of Civil Engineering, University of Moratuwa. |
en_US |
dc.identifier.uri |
http://dl.lib.uom.lk/handle/123/17822 |
|
dc.description.abstract |
Many pile designs are done as bored cast-in-situ end bearing pile designs in Sri Lanka and the
reason for that is the availability of hard bedrock at relatively a shallow depth compared to other
countries. These designs are mostly done using ICTAD/CIDA guidelines. However, many
researchers have identified some issues that are generated with conventional pile design methods
and construction procedures of the piles. Test piles are widely being used to check the accuracy of
assumptions that are generated with the designs. End bearing and skin resistance of the rock are
only considered in most of the pile designs in Sri Lanka. Because of this phenomenon, skin
resistance of soil layers that have a high SPT “N” value is not considered for the capacity
estimation. In this study, the applicability of estimation of carrying capacity of the pile considering
the soil layers which have higher SPT “N” value was verified. Therefore, a comparative study was
conducted together with two main research objectives. It was required to evaluate which design
procedure is more effective when comparing the estimation of the pile capacity considering all the
layers which have SPT “N” values more than or equal to 15 (as criteria 1) or the pile capacity only
considering the skin and toe resistance in the bedrock (as criteria 2), and a comparison of the
estimated allowable carrying capacity values according to the ICTAD/CIDA and Euro code 7
guidelines with the actual allowable carrying capacity values which were taken from the CAPWAP
analysis of PDA test results was also considered as a primary objective in this study.
As per the methodology, required data and information were gathered and the soil parameters were
calculated by obtaining corrected SPT “N” values. Thereafter, allowable carrying capacity
according to ICTAD/CIDA guidelines and design carrying capacity according to Euro code 7
guidelines were estimated for both criteria. The difference between the estimated values of both
criteria was represented as a percentage. After selecting more suitable and applicable criteria, the
capacity values which were estimated using those criteria were compared with actual allowable
carrying capacity values.
According to the analysis, the difference between the estimated values of both criteria were
approximately ranged between 6% - 65% for the estimation according to ICTAD/CIDA guidelines
and 16% - 150% for the estimation according to Euro code 7 guidelines. Therefore, the estimation
of the pile carrying capacity considering all the layers which have SPT “N” values more than or
equal to 15 is better predicted than the estimation of carrying capacity of the pile only considering
the skin resistance of rock and end bearing of the pile. As per the comparison of the actual and
estimated allowable capacities, it is possible to obtain overestimations or underestimations that
will rely on the assumptions made about the properties of soil and rock layers. Therefore, the
accurate soil parameters and properties should be maintained in estimations and, the geotechnical
investigation of the site should be more accurate. |
|
dc.language.iso |
en |
en_US |
dc.publisher |
Department of Civil Engineering, University of Moratuwa |
en_US |
dc.subject |
Bored and cast in-situ piles |
en_US |
dc.subject |
Carrying capacity of piles |
en_US |
dc.subject |
Pile designing methods |
en_US |
dc.subject |
High strain dynamic load test |
en_US |
dc.title |
Development of an alternative approach for bored and cast in-situ pile design using PDA test results |
en_US |
dc.type |
Conference-Abstract |
en_US |
dc.identifier.faculty |
Engineering |
en_US |
dc.identifier.department |
Department of Civil Engineering |
en_US |
dc.identifier.year |
2021 |
en_US |
dc.identifier.conference |
Civil Engineering Research Symposium 2021 |
en_US |
dc.identifier.place |
Katubedda |
en_US |
dc.identifier.pgnos |
p. 30 |
en_US |
dc.identifier.proceeding |
Proceedings of Civil Engineering Research Symposium 2021 |
en_US |
dc.identifier.email |
supipikaushalya95@gmail.com |
en_US |
dc.identifier.email |
udeni@uom.lk |
en_US |