07
Apr

Estimating Pile Axial Bearing Capacity by c-phi Derived from Pressuremeter Test

Written by Gouw Tjie Liong, Ir., M.Eng, ChFC, PhD. Posted in Geotechnic, GTL Paper, Publication, Technical Paper & Presentation (Others)

ABSTRACT: Due to its rather brittle nature, retrieving undisturbed samples of Jakarta cemented greyish stiff clay, often found at a depth of 30 to 120m, is very difficult. Good and reliable effective shear strength parameters, i.e., c’ and f’ values, obtained from triaxial test are hardly available.  By modifying cavity expansion theory, Gouw (2017) was able to derive these effective shear strength parameters through Pressuremeter in situ test stress strain curve. It was found Jakarta cemented clay exhibiting a drained behaviour when loaded. Its effective cohesion, c’, values are linearly increasing with depths, averaging from around 95 kPa at 20 m to around 475 kPa at 100m depth, while its effective friction angle f’ values are within 20o – 30o, averaging to around 24o. The values found to be similar to the values derived from CIU triaxial compression test from relatively good undisturbed samples. This paper presents the methodology in deriving the shear strength parameters and then applying the derived Pressuremeter c’ and f’ values to estimate the pile axial bearing capacity through finite element simulation and comparing it with the commonly known SPT method applied in Jakarta.

Download full paper: Pile Capacity from PMT Data

13
Jan

Download link of Dr. Gouw’s papers

Written by Gouw Tjie Liong, Ir., M.Eng, ChFC, PhD. Posted in GTL Paper, Publication

  1. Analysis on Laterally Loaded Group Piles by Plaxis 3D Foundation, click: here
  2. Notes on The Application of Spring Constant and Soil Structure Interaction Problem, click: here
  3. Soil Stiffness For Jakarta Silty And Clayey Soils, click: here
  4. Teknik Uji Non Destruktif Untuk Mendeteksi Integritas Pondasi Tiang, click: here
  5. Keruntuhan Galian Dalam -Apakah Penyebabnya?, click: here
  6. Deep Excavation Failures, Can They be Prevented?, click: here
  7. Hitung Balik Nilai Kekakuan Tanah dari Hasil Pile Loading Test dengan Menggunakan Program Plaxis, click: here
  8. Slope Stability – Limit Equilibrium Vs Finite Element Method, click: here
  9. Soil Improvement by Vacuum Preloading for a Power Plant Project in Vietnam, click: here
  10. The Application of Ground Improvement Techniques In Indonesia, click: here
  11. Performance Of Micropiles Subjected To Repetitive Load And Unload Cycles Of 1500kn Load, click: here
  12. Analisa Beban Gempa pada Dinding Besmen dengan Plaxis 2D, Click: here
  13. Common Mistakes On The Application Of Plaxis 2d In Analyzing Excavation Problem, click: here
  14. Kinerja Jangka Panjang Angkur Tanah dan Pengaruhnya Terhadap Stabilitas Dinding Diaphragma – Sebuah Studi Kasus, click: here
  15. Importance Of Elongation Factor In Determining Geosynthetics Stiffness For Finite Element Calculation, click: here
  16. Seberapa Besar Pengaruh Efek Gangguan dan Hambatan Alir pada Prefabricated Vertikal Drain ?, click: here
  17. Effect of Pile Cap Thickness and Magnitude of Lateral Movement on Group Capacity of Laterally Loaded Piles, click: here
  18. Expanded Polystyrene for Road Embankment on Soft Clay, click: here
  19. An Investigation On The Suitable Constitutive Law For Modelling Jakarta Red Clay, click: here
  20. Design of earth structures reinforced with polymeric and metallic reinforcements using limit equilibrium methods, click: here
  21. High Hybrid Reinforced Soil Slope As Runway Support – A Case Study, click: here
  22. The Important Role of Execution and CQA/CQC Plans in Building with Geosynthetics, click: here
  23. Effects of Pile Lateral Movement, Pile Spacing And Pile Numbers On Laterally Loaded Group Piles, click: here
  24. Consolidation parameters – alternative to Casagrande and Taylor methods, click: here
  25. Dynamic Compaction Design Guideline For Practicing Engineers, click: here
  26. Common Mistakes in Designing MSE Wall with Finite Element Method, click: here
  27. Tunneling Induced Ground Movement And Soil Structure Interactions, click: here
  28. Estimating Pile Axial Bearing Capacity by c-phi Derived from Pressuremeter Test, click: here
  29. Protection Of Slope Surface With Geofoam Versus Compacted-Fill, click: here
  30. Numerical Modelling of Energy Pile by Different Constitutive Models, click: here
  31. Slope Stabilization By Used Of Geosynthetics In Clay Shale Formation, click: here
  32. Vibrocompaction Proposed Design Guideline for Practicing Engineers, click: here
  33. STATRAPID – Alternatif Uji Beban Statik, click: here
  34. Interpretasi Kuat Geser Tanah Lempung Teguh Jakarta Dari Data Pressuremeter Berdasarkan Pengembangan Teori Cavity Expansion, click: here
  35. Can a Pile Load Tested to ‘Failure’ be Used as a Working Pile?, click: here
  36. Vacuum preloading, an alternative soft ground improvement technique for a sustainable development, click: here
  37. Vibro-Kompaksi, Perancangan, Pelaksanaan dan Studi Kasus, click: here
  38. Sonic Logging vs PIT untuk mendeteksi Integritas Pondasi Tiang, click: here
  39. Geosynthetics Application in Indonesia – A Case Histories, click: here
  40. Case Histories on the Application of Vacuum Preloading and Geosynthetics Reinforced Soil Structures in Indonesia, click: here

20
Jun

Can a Pile Load Tested to ‘Failure’ be Used as a Working Pile?

Written by Gouw Tjie Liong, Ir., M.Eng, ChFC, PhD. Posted in GTL Paper, Publication

by: T. L. Gouw and A. Gunawan

ABSTRACT: There are a few available loading test methods to obtain a load-settlement curve of a pile. Likewise, there are many definitions to determine the ‘ultimate’ pile capacity from a load-settlement curve. Although pile load tests have been widely used over the past decades, there are still many questions regarding its practice and interpretation. Frequently asked questions include: when does a pile test considered to have failed? From an economic point of view, a failure in pile loading test can cost quite a lot of money. To what load can the pile be loaded till it is considered to have failed? Can a pile loaded to failure still be used as a working pile? What is a bidirectional pile load test (BD-test)? When should a BD-test be used? Can a pile tested with a BD be used as a working pile? What are the differences between kentledge or reaction piles static loading test with the bidirectional test? Do the different pile tests produce the same results? This paper aims to shed light on these questions, one case history where the pile tested to ‘failure’ and later used as working piles is presented.

Download full paper: http://indogeotek.com/wp-content/uploads/2020/06/07-Gouw-Gunawan-2020-Jun-SEAGS-EJ-65-72_P08-CanPileTested2FailureBeUsedAsWorkingPile.pdf

Geotechnical Course

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