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High Strain Dynamic Pile Testing by Pile Driving Analyzer (PDA)

High strain dynamic testing is a method of testing deep foundations to obtain information about their capacity and integrity, and in some cases, to monitor their installation. It is codified by ASTM D4945-12 – Standard Test Method for High-Strain Dynamic Testing of Piles.High strain dynamic testing is called dynamic pile monitoring when it is applied during pile driving and dynamic load…
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Pile Foundation Construction Procedure

We have already defined the pile foundation, its type and importance in case of low bearing ground conditions. But this post will mainly deal about the procedures and steps that are undertaken for the construction of pile foundation. Pile foundation construction procedure is…
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Difference between End Bearing Piles and Skin Friction Piles.

Deep foundation especially pile foundation is best suited and mostly used for a low bearing and bad textured soil or for the heavy load structures. Bearing capacity is the deciding factor for the geotechnical design of foundation. Bearing capacity of soil is defined as load bearing capacity of the soil without having different settlement as well as shear failure in the undernetath soil of the…
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Tunnels and their stability mechanisms

Tunnels and their stability mechanisms Introduction Tunnels can be defined as underground construction for the connection between two destinations to build up an effective means of transportation. Tunnels are made for various purposes such as Railway transportation, for highways, for water supply and for communication cables etc. Tunnel construction has several benefits e.g. less disturbances to…
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What is Stepped Foundation

The natural surface of ground is not always level and mostly to such an extent that there may be a considerable slope either across or along or both across and along the site of most buildings. Where the ground floor is to be at or just above ground level at the highest…
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What are fender Piles?

The piles used to protect concrete deck or other water front structures from the abrasion or impact that may be caused from the ships or barges (when they are tied up at the desk), are called fender piles. The fender piles are originally made up to timber. Sometimes a…
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Automatic Concrete Pile Reinforcement Cage Welding Machine

The bearing capacity of the soil and the loading conditions sometimes not allow the usage of shallow foundation and thus the designer opts for deep foundations like that of pile foundation. The rebar of pile foundation whether cast-in situ and driven piles rebar fixing and cage lowering is a critical activity that needs expert supervision and precision. The sub-standard and poor workmanship at…
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What Is Under-reamed Pile Foundation?

Many times during soil exploration, geotech engineers have to face soils that are very likely to undergo volumetric changes due to moisture variation underneath the ground surface. This expansion and shrinkage can cause distress which is very dangerous and critical as far as…
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What Is Cofferdam And Its Types?

Yesterday I was watching documentary on a Bridge having piers founded in the water and was wondering how engineers and constructors are able to lay pile foundation in such a high-speed flowing water of river.  After research of few hours I have got a handful of knowledge…
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What Are Secant PILES?

You might have heard a structure called Cofferdam, it is a structure built to divert water either of river or groundwater so as to make a dry, safe and sound environment for the construction activity to carry out. This cofferdam can be a typical retaining wall type or it can be one shape we will discuss in this article which is called secant pile or tangent pile.  Pile foundation is a type of…
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Methods of Reducing Soil Liquefaction

It is extremely difficult and impractical to prevent liquefaction of soil in the field when the susceptible zone extends to a large depth. It is generally best not to construct buildings and other structures at sites prone to liquefaction. Because the remediation of the…
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Types of Soil Liquefaction

Liquefaction is a state of water- saturated, mostly cohesion-less soil whose shear strength is reduced to zero due to pore water pressure produced by vibration during an earthquake. The soil starts behaving like a liquid. For more details on Soil Liquefaction Please refer…
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Sand Boils due to Liquefaction

Liquefaction produces so many drastic effects and damages to the structures and foundations build over its effected soil. The buildings and structures whose foundations are on soil affected by liquefaction will experience a sudden loss of support which will result in drastic and irregular settlement of the building causing cracking of foundations and damage to the building structure itself. One…
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