Specialist in Design, Supervision/Execution of:

Dewatering,Pumping Test,PDA-PIT-Sonic Logging-Vibration Monitoring,
Pile/Plate Load Test,Soil Instrumentation,Soil Nailing,MicroPile,Grouting
Deep Foundation,Deep Excavation,Slope Stability,Ground Improvements
Geosynthetics & Other Geotechnical Works
Agent of Geotechnical Softwares:
PLAXIS, GEO5, Deltares, DC Software, RocScience, GeoSmart, NovoTech, etc.

Dr. GOUW Tjie-Liong Ir., M.Eng., ChFC.

  • Senior Geotechnical Consultant
  • Chartered Financial Consultant, ChFC
  • Senior Geotechnical Engineering Lecturer/Trainer
  • Provider of Geotechnical Short Course / Training
GTL Brief Profile

My Archives

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

26
May

PROTECTION OF SLOPE SURFACE WITH GEOFOAM VERSUS COMPACTED-FILL

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

BY: ANTHONY GUNAWAN PHD & DR. GOUW TJIE-LIONG

ABSTRACT: Slope failures are very common in hilly areas with high precipitation, Indonesia is one of the countries which experiences frequent slope failures. According to Indonesian National Board for Disaster Management, more than 600 slope failures occurred in 2018, resulting in more than 100 deaths. Slope protection is an important aspect of geotechnical engineering in Indonesia. One common method for slope protection is construction of retaining structures such as gabion. In most cases gabion with rock-fill is an effective solution in mitigating slope failures. However, in some cases, the extra load from the rock-fill aggravate the stability of slope instead. One particular example is taken from a case study in Puncak. A 28 m high slope, with a villa beside the peak of the slope, had experienced multiple slope failures ever since the construction of villa 30 years ago. Currently, the slope has a gradient (horizontal versus vertical) of 0.35:1 for the bottom 5 meters; 0.7:1 for the next 8 m; 1.3:1 for the following 10 m; and near vertical for the last 5 m. A retaining system using gabion and rock-fill behind the gabion was modelled with GEO5 and PLAXIS. PLAXIS analysis show that failure will occur in the midst of construction. Alternative fill using a light-fill material, geofoam, was then carried out and the construction can be carried out successfully. The retaining structure also acts as an erosion control and reduces water infiltration from rainfall.

Download Full Paper: http://indogeotek.com/wp-content/uploads/2019/11/AG-GTL-190927s-GeoFoamProtectedSlope-Slope2019-Bali.pdf

26
May

Numerical Modelling of Energy Pile by Different Constitutive Models

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

BY: ANTHONY GUNAWAN PHD & DR. GOUW TJIE-LIONG

ABSTRACT: Energy pile is an innovative technology which combined foundation pile with heat pumps. Through this integration, foundation pile can then serve as cooling and heating system, in summer and winter, respectively. During energy pile operation, the pile is subjected to heating and cooling cycles. The thermal cycles induce thermal-induced settlement, and predicting this settlement is a major challenge. As the thermal loading of energy pile is cyclic in nature, constitutive model capable of modelling cyclic hysteresis is necessary. In this paper, a model energy pile embedded in saturated sand and subjected to 5 thermal cycles are back-analyzed using hardening soil with small strain stiffness model. To highlight the importance of modelling cyclic hysteresis, two constitutive models which cannot model the cyclic hysteresis, i.e. hardening soil model and Mohr Coulomb model are used to back analyse the same test. Results show that hardening soil with small strain stiffness model can model the test reasonably well, while hardening soil and Mohr coulomb model severely underestimate the thermal-induced settlement.
Download full paper: http://indogeotek.com/wp-content/uploads/2019/11/AG-191014-16ARC-Taipei-Numerical-Model-of-Energy-Pile.pdf

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