DISC – Penggolongan Kepribadian

Prilaku manusia bisa dikategorikan dalam 4 huruf DISC. Yang artinya lebih kurang:

D = Dominance,
Kategori orang yg menekankan hasil nyata dan mempunyai tingkat keyakinan tinggi. Tipe No nonsense. Biasanya selalu melihat gambaran besar (sasaran akhir), berani menerima tantangan2, bicara lurus dan tidak bertele-tele.
Biasanya pemimpin besar politik masuk kategori ini. Contoh: Churchill, Lee Kuan Yew, Lincoln dll.

I = Influence,
Kategori orang yg menekankan mempengaruhi/merayu orang, keterbukaan dan hubungan satu sama lain. Prilaku umum: antusiastik, optimistik, suka kerja sama, dan sangat tidak suka kalau diacuhkan.
Biasanya artis2 tergolong ini.

S = Steadiness,
Orang yg menekankan kerja sama, ketulusan dan ketergantungan satu sama lain. Prilaku utama: tidak suka diburu-buru, pendekatan masalah tenang termasuk alon alon asal ke lakon, supportive dan sederhana.
Biasanya orang2 jenis ini tidak suka perubahan. Tipe ingin hidup tenang, intrinsik agak tidak suka tantangan baru. Memerlukan dorangan seorang pemimpin.

C = Conscientious,
Orang yg menekankan kualitas, akurasi, presisi, keahlian, dan kompetensi.
Prilaku utama: menikmati ketidak-tergantungan pada orang lain (independen), selalu mencari alasan objektif, menggali hingga detail, was was kalau kalau berbuat salah.
Engineer harus mempunyai sifat ini.

Kalau digambarkan dalam figuratif binantang adalah sbb:

D = Hiu
I = Teddy bear
S = Domba
C = Burung hantu

Termasuk golongan manakah anda?

Live like a Pencil

A Pencil Story
I believe I was born for a purpose!
I hesitated what I am for?
I seek and realized I am born to write!
To write meaningfully…
And I start writing…
Inherently, at times I make mistake…
But I know mistake is only a word…
And I can learn from the mistake…
Mistake is a clue to redo,
Redo in a different way,
I have the in built power
to get up and make correction!
One of the days I do worn up,
I was dull and blank….
However, I believe what is important is inside,
So, I go and sharpen myself,
To dig the inner side of me,
And I find I can write even better.
Although my life is getting shorter,
and will eventually die off..
But I know, what I will leave behind is a legacy for the world to read and learn!!
(GTL-SG-MRT-150818 freely rewritten from BillyK)

A Geotechnical Short Course on Ground Improvement

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Jakarta, 1-3 September 2015

Covering theoretical design calculation,execution, monitoring and interpretation. Practice design and data interpretation session shall be given.

  1. PRECOMPRESSION With VERTICAL DRAINS: Basic Principles, Type of Vertical Drains, Application, Design Method and Calculation, Installation, Instrumentation, Monitoring, Interpretation, Asaoka Method, and Case Histories.
  2. VACUUM PRELOADING: Surcharging vs Vacuum Method; Execution; Monitoring System; Improved Ground; Application Examples and Case Histories (with projects in Indonesia and Vietnam)
  3. Liquefaction potential analysis:What is Liquefaction; Liquefaction Phenomenon; Liquefaction induced Damages; Identifying Liquefaction Potential; Cyclic Stress Ratio – CSR; Assessing Liquefaction through SPT data; Assessing Liquefaction Potential through CPT data; Liquefaction of Deeper Layer; Calculation Examples. Analysis of Liquefaction potential by using Novo Liquefaction software shall be given.
  4. DYNAMIC COMPACTION: Equipment, Mechanism, Execution procedure, Design Guidlines and Case Histories.
  5. VIBROCOMPACTION – VIBROFLOATATION – STONE COLUMNS: Vibro Compaction Mechanism, Dry Process, Wet Process, Vibroflotation, Vibrocat, Stone Columns, Design Guidelines, Case Histories.
  6. JET GROUTING: Various Grouting Techniques, Equipment, Execution, Formation, Cementand Composition, Application of Jet Grouting.

click here for detail, 2015-09-010203 – Course Ground Improvement

Kinerja Jangka Panjang Angkur Tanah dan Pengaruhnya Terhadap Stabilitas Dinding Diaphrgama – Sebuah Studi Kasus

Abstrak: Krisis ekonomi berkepanjangan semenjak akhir 1997 mengakibatkan banyak proyek yang terbengkalai cukup lama, diantaranya adalah galian basement yang ditinggalkan begitu saja. Makalah ini membahas salah satu proyek dengan galian basement yang sudah diselesaikan hingga kedalaman final antara 14-16.5m dari muka tanah asli. Sistem dinding penahan tanah yang digunakan adalah dinding diaphragma dengan tiga dan empat lapis angkur tanah. Saat krisis ekonomi melanda, kegiatan proyek dihentikan total, dewatering air tanah tidak lagi dilakukan, hanya pemompaan air permukaan saja yang dilakukan, itupun dengan intensitas yang sangat kurang. Galian dibiarkan terbuka selama lebih dari 6 tahun. Pertengahan Juni tahun 2003, dilakukan pengukuran-pengukuran, diantaranya: defleksi dinidng penahan tanah, gaya-gaya yang bekerja pada angkur tanah. Pengukuran ini diikuti dengan evaluasi terhadap kinerja angkur tanah dan keamanan dinding diaphragma. Diketahui bahwa angkur tanah mengalami kehilangan gaya-gaya yang cukup signifikan, yang bila dibiarkan akan dapat mempengaruhi keamanan dinding diaphragma. Disimpulkan bahwa diperlukan konstruksi berm untuk menambah kesatabilan dinding diaphragma sebagai tindakan preventif.

Download full paper: GTL-J03-2004-HATTI-Kinerja Jangka Panjang Angkur Tanah

A Geotechnical short course on Slope Stability, Lateral Earth Pressure and Deep Excavation with application of Geo5 softwares

Jakarta, 24-26 June 2015

Background: In our practice as geotechnical and civil engineers we are often faced with excessive slope movement and even slope failures; excessive ground movement and failure of deep excavations, be an open cut or supported excavation, is also one of the construction problems we often encountered. Those failures are often caused by lack of adequate geotechnical design knowledge and construction processes. This short course is designed for consulting engineers, contractor, and academican to enhance their knowlege and skill in appreciating important factors affecting the stability of slopes and deep excavations so as to design and execute deep excavation projects safely. Case studies of slope and deep excavation failures shall be presented and discussed. The participants shall have chances to learn how to model a proper slope stability and deeep excavtion analysis by using GEO5 softwares.

Course Topics: The course shall be conducted by refreshing the basic relevant geotechnical theory, followed by the in depth discussion of geotechnical engineering knowledge and how to implement those knowledge into practice. The course shall cover the following subjects:

  1. SLOPE STABILITY ANALYSIS: Examples of slope failures; Factors affecting slope stability; Slope types; Infinite slope; Planar Failure; Slip Circle Analysis; Fellenius, Bishop Method and Others; Geosynthetics Reinforced Slopes; Earthquake effects. Case studies by using GEO5 Software.
  2. LATERAL EARTH PRESSURES: Various earth retaining structures; Lateral earth pressures and their coefficients; Earth pressure at rest; Rankine, Coulob, Caquot Kerisel lateral earth pressure theories; Load induced lateral earth pressures. Calculation of lateral earth pressures by GEO5 Software
  3. DEEP EXCAVATION: Execution of deep excavation and Its supporting structures covering Soldier Piles, Secant Pile and Diaphragm walls; Ground Anchors, Quality control; Examples of deep excavation failures; Causes of the failures, followed by discussion on the designing and monitoring aspects. Case studies in desingning deep excavation project by GEO5 Softwares.

for further info: 2015-06-24-25-26-Course on Slope-EarthPressure-DeepExcavation

How to model repetitive loading in Plaxis 2D?

A graduate student from Texas A&M University asked:
I’m currently working on a project related to Rail Embankments. How a repetitive/ cycling loading can be simulated in a typical FEM model (I’m using PLAXIS 2D) considering the effect of fatigue.

My answer:
Use HS small soil model, cyclic loading can then be simulated by choosing dynamic analysis and the loading vs time can be created by making a text file first in Notepad (left column is time, right column is magnitude of loading).

Can Plaxis 2D Model a Laterally Loaded Pile?

Someone have modeled a pile for lateral loading in PLAXIS 2D software,
he asked: In the output file, one table we can check for the results.
Could anyone please tell me what is meant by Nmin,Qmin,Mmax ?

Answer: Old version of Plaxis 2D definitely CANNOT be used to model the laterally loaded pile. In the newest version there is a pile element. But even with this element provided, it is not for calculation of laterally loaded pile. It is a 3D problem, analysis should be done in Plaxis 3D.
Q, N, M refers to shear, normal (axial) and moment.

How Do Problems Arises in Geotechnical Works?

The problems faced by engineers in dealing with soils lie not only on the fact soils are particulate material which have much more complex behavior compared to concrete and steel, but it is also lie to the attitude of those engineers who have no enough “respect” toward the soils they faced.

Soils need to be understood and to be well treated, just like we try hard to understand and to treat a lady. There are four aspects of geotechnic that we need to learn and to understand, those are:

– The soil profiles (type and distribution)

– The ground water table, i.e. , its position, indication of ground water flow, existence of perched water table and artesian water pressure.

– Characteristics and behavior of the existing subsoils

– The right soil model to be taken for designing the planned geotechnical structure.

For all the above, time and money need to be invested. Ask the rich and successful peoples, whether they “invested” time and money to chase for the ladies that eventually became their wives?
Like those ladies, in order to understand the soil behavior, time and money also need to be given (invested) to the soils,

If the engineers understand the above four aspects well, then “comfort” will be belong to the engineers, and ultimately will also belong to the owner and the end users of the said structures / buildings.

On the other hand, if we treat the soils badly, and only give the soils unreasonable amount of time and money, just like cruel parents treat their step children badly. Then: “just wait for the retaliation” of the step children.

You don’t believe me? Look back to the failure of Sano Tower at Pluit area, North Jakarta, in 1991; or to the current “failure” of “S tower” near Cawang, South Jakarta; or to the badly settled “GB tower” at Pluit, North Jakarta. Look back to the Nicoll highway deep excavation (for MRT station) failure in Singapore in 2004; and many other geotechnical failures.

One of the causes of the those failures is the attitude of IGNORANCE or DO NOT CARE or “ASSUMED” TO KNOW BETTER than any other engineers. The over insistence of saving money, all the owner know is only SAVE, SAVE and SAVE. They do not want to spend time and money for soil investigation, and the engineers involved failed to convince the owner to spend the money!! The owner even want to save more, by using bidding process, to suppress the consultant!!! They forgot the words: “You buy peanuts, you get monkeys!”. They feel they are so clever and so able to get cheap price!!! They only want to higher engineers with low fees!!! They forgot CHEAP is not the same as ECONOMICAL. Indirectly, they treat the soils, where their structures shall be built, as step children!!

Then, one day, the step children will retaliate, and when they do so, the retaliation can be so destructive and fatal!!

So, go and tell the owner of the money:
TREAT THE SOIL AS A LADY, THEN THE COMFORT IS YOURS.
TREAT THE SOIL AS A STEPCHILDREN, THE REVENGE IS WAITING FOR YOU!!

Written by Gouw Tjie Liong(English version: April 12, 2015)