CE-Soil Dynamics lab

 | Post date: 2020/01/11 | 
Soil Dynamics Laboratory
Head: Dr. Kazem Fakharian
Email: advsoilslabaut.ac.ir

Technician: Davod Akbarimehr      

Telephone: +98(21)64543062
Address: Soil Dynamics Laboratory, First Floor, Building No. 2, Department of Civil and Environmental Engineering, Amirkabir University of Technology, Hafez Ave., Tehran, Iran
Introduction and Aims
The aim of the theoretical and practical training laboratory of advanced soil tests is to study the behavior of adherent and granular soils, studies of sand liquefaction potential, soil water retrieval properties, as well as the main purpose of familiarizing graduate students with advanced soil testing and laboratory experiments. They are also prepared for conducting thesis-related research.
The Soil Dynamics Laboratory is one of the most valuable laboratories in the field, with devices such as dynamic triaxial, simple double cut, Dynamic Hollow Cylinder and Simple Shear testing, geogrid extrusion machine, physical model for strip foundation study and pile installation simulator.

Laboratory equipment
  • Dynamic Triaxial Test Device
- Sample Dimensions: 50 x 100 mm and 75 x 150 mm
- Overall pressure capacity: 1000 kPa
- Closed-loop Control System
- Ability to apply any stress path and drainage conditions
- Applying dynamic cyclic force with different waveforms (triangular, square and sinusoidal)
- Applying dynamic cyclic force with arbitrary waveform (such as a real earthquake)
- Force or displacement control up to 20 Hz
- Axial load hydraulic jack capacity: 1.3 tons
- Consolidation capability D-1 (or K0)
- Ability to measure small displacements with an accuracy of 0.001 mm
- Ability to test on cemented, untreated and sand samples
  • Hollow Cylinder Apparatus, HCA
Sample Dimensions:
 A: ID = 100 mm, OD = 150 mm
 B: ID = 75 mm, OD = 100 mm
- Overall pressure capacity from around and inside the sample: 1000 kPa
- Capacity of hydraulic jack axial load: 10 tons
- Capacity of hydraulic jack torsion: 225 kNm
- Apply axial, lateral and internal cyclic loads up to 20 Hz
- Closed loop control and the possibility of applying any general and drained stress path
- The Hollow Cylinder Apparatus (HCA) of Amirkabir University of Technology is unique in its size and capabilities worldwide. It is also the first HCA device to be manufactured in Iran. Worldwide HCA devices generally have an outer diameter (OD) of 100 mm. The outer diameter of 150 mm enables the test on coarse grained specimens such as sand and mixed soils.
  • Cyclic Simple Shear Test 3D
(Design and Manufacturing at Amirkabir University of Technology)
- Sample Dimensions: Diameter of 50 and 100 mm
- Mold type: Reinforced rubber membrane
- Vertical applied force jack: 2.5 ton capacity dynamically
- Two sheets of shear forces applied to the horizon: 1.3 ton capacity dynamically
- Apply dynamic cyclic forces in all three directions up to 20 Hz
- Apply elliptical and rotational paths on the horizon plane to the sample
- Ability to test under K0 and triaxial conditions
- Upgrade device for soil-structure interface test capability
- Dimensions of contact surface test specimen: square ring assemblies with 100 mm and 2 mm thickness
- Measurement of shear deformation of soil mass and sliding displacement between soil and structures
Summing up the above 3 devices

The set of 3 soil sampling machines is capable of handling the behavior of any soil type (fine, coarse-grained) under any type of loading, drainage, and stress path in the 2 and 3-dimensional spaces. Such a set with the above-mentioned capabilities is unique even in the world and provides the possibility of seismic and dynamic studies of soil, vibration effect of machinery, liquefaction and so on. Not only can these devices be assisted in understanding the basics of soil behavior and in developing behavioral models, but they are also of particular importance for studies of stability and reinforcement control of buildings and important structures.
  • Physical modeling apparatus, Foundation, retaining wall, ... (Physical Modeling)
(Design and Manufacturing at Amirkabir University of Technology)
The device is capable of testing small-scale physical models under vertical and lateral load conditions. The loads may be monotonic or cyclic. The lab's data logger system allows you to install various tools in the model. The machine is also equipped with a sand precipitation system for uniform and homogeneous construction of granular soils. The force is applied by pneumatic jacks. Until now, this device has been used to study the behavior of retaining walls, buried pipes, tunnels and surface foundations on reinforced soil in the form of several graduate theses.

Some of the benefits
- Ability to apply cyclic loads simultaneously with static loads (to simulate traffic loads, industrial machinery, earthquakes, etc.)
- Ability to produce homogeneous sand samples of different densities (with the help of precipitation system)
- Ability to record horizontal pressures caused by successive loads at various points on the model wall
- Ability to use different types of reinforcers such as: Geogrid, Geotextile, Geocell
Engineering Applications (Industry Relationship)
This device has the potential of modeling various types of surface, semi-deep and deep, buried pipes in the soil, retaining walls, etc. located on reinforced soil with geosynthetics or other related reinforcement and conducting research to obtain results. It has an application for generalization to industry in these areas, for example, given the soft and loose substrates in many parts of the country, reinforcing the soil to increase its bearing capacity and reducing its reliance on engineers' options is in practical projects. In order to achieve a safe and economical design, there must be a proper understanding of the load behavior of the foundations on the reinforced soil. For this purpose, and with the aim of eliminating the deficiencies in the research so far, a reduced-scale physical model has been developed in the Soil Dynamics Laboratory of Amirkabir University of Technology, which has yielded very useful and useful results so far.
  • Pullout Test  Devices
(Design and Manufacturing at Amirkabir University of Technology)
Geogrid pullout device is a unique device for the interaction of geogrids and geotextiles with soil designed and built in Amirkabir University of Technology. This device investigates the force-displacement behavior and pullout resistance with the possibility of applying vertical stresses to the soil through the air cushion in the upper part and applying the tensile force in front of the device by the hydraulic jack. The machine is closed-loop controlled and monotonic and cyclic forces can be applied to power and displacement control.
View of Geogrid and Geotextile Pullout Test  Device
  • Pile Setup Consolidation Chamber Device
(Design and Manufacturing at Amirkabir University of Technology)
Physical modeling device has a cylinder chamber that has a capacity of 40 cm in diameter and 100 cm in height. Installation of the pre-made pile is done by means of a knock or pressure method with a jack. The pile has been fitted and can measure the pore water pressure and axial pressure along the pile. After installing the pile, loading tests are performed on the pile at different times and the process of occurrence of the setup phenomenon over time is investigated. The results of this experiment can evaluate different components of this phenomenon, including the dissipation of pore water pressure and aging. The consolidation jack consists of a loading plate and several interconnecting rod pieces that provide the ability to consolidate the clay layer. Inside the steel chamber is a 40 cm diameter perforated GRP pipe that accelerates the consolidation process by creating radial drainage conditions. The bushing system consists of a separate interface bar and weights that allow it to be bent at different weights and also to fall to a height of up to 50 cm.
  • Microscopic behavioral apparatus of triaxial samples
(Design and Manufacturing at Amirkabir University of Technology)
This device was first designed and manufactured in Iran at the Soil Dynamics Laboratory of Amirkabir University of Technology and there are few similar specimens abroad. Epoxy injections into triaxial specimens allow microscopic examination of specimen tissue at any time of loading.

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