scholarly journals Effect of Helical Geometry on the Axial Compressive Capacity

2020 ◽  
Vol 5 (6) ◽  
pp. 717-723
Author(s):  
Yofy Kurniawan ◽  
Maulid M. Iqbal ◽  
Ratna Dewi
Keyword(s):  
Bearing Capacity ◽  
Static Loading ◽  
Pile Foundation ◽  
Clay Soil ◽  
Loading Test ◽  
Pile Capacity ◽  
Round Shape ◽  
Static Loading Test ◽  
Helical Geometry ◽  
Definition Of

Helical pile is an invention in pile foundation with a main objective of increasing pile capacity. According to Prasad, et.al (1996), definition of helical pile is a pile foundation that equipped with one or more helix that has a round shape, attached to the shaft with a certain distance between helixes. The aim of this study is to understand the effect of helixes number to the bearing capacity. In this study, empirical model is validated with the static loading test on three different type of helical pile: 1) single shaft, 2) helical pile with the same diameter of helixes and, 3) helical pile with different diameter of helixes on clay soil. The diameter of helixes are 15 cm, 20 cm, and 25 cm with distance between helixes 50 cm. The result shows the bearing capacity increase of single shaft to helical pile 252% - 369%. Moreover, the comparison of bearing capacity between helical pile with the same diameter of helixes and helical pile with different diameter of helixes is explained in this study.

scholarly journals A STUDY FOR CHARACTERISTIC OF VERTICAL BEARING CAPACITY OF FOOTING FOUNDATION WITH SHEET PILES BY STATIC LOADING TEST

2007 ◽  
Vol 63 (3) ◽  
pp. 772-782
Author(s):  
Hidetoshi NISHIOKA ◽  
Masayuki KODA ◽  
Masaru TATEYAMA ◽  
Osamu MURATA ◽  
Junichi HIRAO ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Static Loading ◽  
Loading Test ◽  
Static Loading Test ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

Static Loading Test and Evaluation of Single Beam of Highway Prestressed Concrete Hollow Slab Beam Bridge

2014 ◽  
Vol 587-589 ◽  
pp. 1718-1722
Author(s):  
Tai Li Chen ◽  
He Li ◽  
Zhi Hao Wang ◽  
Xiao Ke Li
Keyword(s):  
Distribution Coefficient ◽  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Static Loading ◽  
Limit State ◽  
Loading Test ◽  
Transverse Distribution ◽  
Single Beam ◽  
Capacity Evaluation ◽  
Static Loading Test

Since the main beams of a prestressed concrete hollow slab beam Highway Bridge stored for too long, in order to assess its bearing capacity, static loading test and bearing capacity evaluation of single beam was conducted. The hollow slab beam at the locations where the transverse distribution coefficient is biggest was chose for testing, and the transverse distribution coefficient at midspans of the slab beam was calculated by the hinged slab method. By comparing the theoretical and measured values of displacement and stain at key points of the beam, structural performance of the beam was finally evaluated. The test results showed that both the strength and stiffness of the beam was conforming to the requirements of the specification and able to satisfy normal use requirements in serviceability limit state.

scholarly journals Field Performance of Open-Ended Prestressed High-Strength Concrete Pipe Piles Jacked into Clay

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4216 ◽  
Author(s):  
Hai-Lei Kou ◽  
Wen-Zhou Diao ◽  
Tao Liu ◽  
Dan-Liang Yang ◽  
Suksun Horpibulsuk
Keyword(s):  
Bearing Capacity ◽  
Static Loading ◽  
High Strength Concrete ◽  
Field Tests ◽  
Field Performance ◽  
High Strength ◽  
Loading Test ◽  
Strength Concrete ◽  
Axial Forces ◽  
Static Loading Test

The behavior of open-ended pipe piles is different from that of closed-ended pipe piles due to the soil plugging effect. In this study, a series of field tests were conducted to investigate the behavior of open-ended prestressed high-strength concrete (PHC) pipe piles installed into clay. Two open-ended PHC pipe piles were instrumented with Fiber Bragg Grating (FBG) sensors and jacked into clay for subsequent static loading tests. Soil plug length of the test piles was continuously measured during installation, allowing for calculation of the incremental filling ratio. The recorded data in static loading test were reported and analyzed. The distribution of residual forces after installation and the effect on the bearing capacity were also discussed in detail. The test piles were observed to be in partially plugged condition during installation. The measured ultimate shaft resistance and total resistance of the test piles were 639 and 1180 kN, respectively. The residual forces locked in the test piles after installation significantly affected the evaluation of the axial forces, and thus the shaft and end resistances. It tended to underestimate the end resistances and overestimate the shaft resistances if the residual forces were not considered in the loading test. However, the residual forces did not affect the total bearing capacity of open-ended PHC pipe piles in this study.

Pile Bearing Capacity Improvement by Post-Grouting on Tip and Side

2011 ◽  
Vol 261-263 ◽  
pp. 1313-1318 ◽  
Author(s):  
Ji Feng Liu ◽  
Xiu Qin Cui
Keyword(s):  
Bearing Capacity ◽  
Static Loading ◽  
High Strain ◽  
Dynamic Test ◽  
Differential Settlement ◽  
Loading Test ◽  
Static Loading Test ◽  
Capacity Improvement ◽  
Post Grouting

For verifying pile bearing capacity improvement by post-grouting on tip and side and the decrease of building settlement, 10 tip and side post-grouting and 2 unpost-grouting piles are tested by low strain dynamic test, static loading test, stess distribution monitoring and high strain dynamic test, and the building settlement is monitored. It is indicated that all piles length and integrity are meeting the challenge, the post-grouting piles bearing capacity are at least 70% improved than that of unpost-grouting piles, designing pile bearing capacity as 8800kN is safer, the building maximal settlement and the differential settlement is satifying. The preliminary designed 904 piles are reduced to 531 by adopting post-grouting technique and about 20% cost of pile engineering is saved, the proper grouting stata choosing, the accurate grounting volume and pressure controlling in the post-grouting constrution process are needed.

Tests and Researches on Post Grouting Cast-in-Place Piles of Power Transmission and Transformation Project

2014 ◽  
Vol 1065-1069 ◽  
pp. 1586-1589
Author(s):  
Pei Chen ◽  
Qiang Cui
Keyword(s):  
Bearing Capacity ◽  
Static Loading ◽  
Power Transmission ◽  
Low Cost ◽  
Loading Test ◽  
Good Reliability ◽  
Capacity Level ◽  
Static Loading Test ◽  
Post Grouting ◽  
Easy Operation

Technology methods of cast-in-place pile post grouting has the advantages of easy operation, good reliability, low cost and bearing capacity growth. In order to study and demonstrate the method on bearing capacity level of cast-in-place pile, a series of tests including of vertical static loading test and horizontal static loading test were used in the job. Some testing results were obtained from the tests.

A Caculation Method Discussion of Vertical Bearing Capacity on End Post-Grouted Drilled Piles

2011 ◽  
Vol 243-249 ◽  
pp. 1033-1037
Author(s):  
Jie Liu ◽  
Yan Yan Zhang
Keyword(s):  
Bearing Capacity ◽  
Static Loading ◽  
Reference Value ◽  
Influence Coefficient ◽  
Loading Test ◽  
Truncated Cone ◽  
Cone Model ◽  
Static Loading Test ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

This article establishes a circular truncated cone model of the post-grouted induration end,brings forward a integrative influence coefficient and edtablishes a simple vertical bearing capacity caculation formula of post-grouted piles with the broaden diameter caculating the end resistance of the pile, which has considered the influence of mortar volumn.According to a certain number of engineering experiment,the tesults derived from this formula can fit the static loading test bearing capacity of the post-grouted drilled piles well,which can provides a certain engineering practical reference value.

Experiment Study on Bearing Capacity of Muddy Siltstone Foundation and its Application

2013 ◽  
Vol 838-841 ◽  
pp. 101-106
Author(s):  
Dong Sheng Yang
Keyword(s):  
Theoretical Analysis ◽  
Bearing Capacity ◽  
Skin Friction ◽  
Static Loading ◽  
Soft Rock ◽  
Single Pile ◽  
Experiment Study ◽  
Loading Test ◽  
Static Loading Test

Rock-socket cast-in-situ piles is a commonly used style of foundation, but theoretical analysis, experiments and test research of bearing capacity behavior about rock-socket piles in soft rock have not adapted to the requirement of engineering. The static loading test of single pile on a project in argillaceous and silt laminate, through which the skin friction and point bearing capacity were measured, the bearing capacity behavior of rock-socket cast-in-situ piles in soft rock was analyzed.

scholarly journals Research and development of thick rubber bearing for SFR (Design formulas for thick rubber bearing based on static loading test utilized scale model)

2017 ◽  
Vol 83 (852) ◽  
pp. 17-00050-17-00050 ◽  
Author(s):  
Tsuyoshi FUKASAWA ◽  
Shigeki OKAMURA ◽  
Tomohiko YAMAMOTO ◽  
Nobuchika KAWASAKI ◽  
Satoru INABA ◽  
...  
Keyword(s):  
Research And Development ◽  
Static Loading ◽  
Scale Model ◽  
Loading Test ◽  
Rubber Bearing ◽  
Static Loading Test

Results of an Instrumented Static Loading Test and Its Application to Design Compilation of an International Survey

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Bengt Fellenius
Keyword(s):  
Prestressed Concrete ◽  
Static Loading ◽  
Ground Surface ◽  
Loading Test ◽  
Text Book ◽  
Ground Surface Settlement ◽  
Static Loading Test ◽  
Residual Force ◽  
Available Information ◽  
Piled Foundations

Results of a static loading test were used together with soil exploration records in a survey comprising analysis of the test records and estimating settlement of piled foundation to support a pipe rack. The test pile was a strain-gage instrumented, 400-mm diameter, precast, prestressed concrete pile driven into a clay and silt deposit to 25 m embedment. Two main issues were expected to be addressed by the survey participants: First, realization that the strain records were affected by presence of residual force in the pile and, second, calculation of the settlement of the piled foundation expected from the foundation load. A total of 52 submissions were received from 20 different countries. Only 12 of the submissions realized the presence of residual force. Most submissions reported a calculated settlement of the piled foundations ranging from 10 mm through 50 mm; however, 11 reported values between 60 and 200 mm. Surprisingly, only 20 submissions reported ground surface settlement close to the 200-mm value resulting from text-book analysis based on the available information. The subsequent construction of the piled foundations coincided with placing a fill across the site and lowering of the groundwater table, thus, causing a general subsidence.

Sign in / Sign up

Export Citation Format

Share Document