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Geotechnical Engineering Laboratory

Test Apparatus

Direct shear test apparatus (1948)


Overview testing machine

In order to examine the measures of landslides and slope failures,
device for measuring the shear strength of slip surface When measuring the strength of the softened state completely, it is possible to create a specimen by compaction from the sample slurry in the shear box performs shear as it is, we can test easily compared to the triaxial compression test .

device configuration

Movable box on the lower surface, the normal force loading gauge vertical load is attached to the side reaction force
Around 15cm diameter 3cm thick specimens
characteristic of shear box
In order to reduce the friction between the contact surfaces of the shear box shear plane of the specimen, it is processed so as to be a gap in the shear plane of the specimen and shear box.

Triaxial compression testing machine

Automatic recording of data is possible by programs that are specific to this test equipment. Direct measurement of the effective confining pressure of saturated specimens by differential pressure gauge. Accurate measurement of the axial load by load cell was placed in a triaxial cell.
Outer tie rod cell scheme on the inside of the pressure cell.

cell method outside
You can set the pressure cell after binding of the cap and the loading piston.
Risk of disturbed during installation in soft specimens can be sealed to the cap that is fixed to the piston loading the membrane when the set of small specimens.
Asked exactly the displacement axis of consolidation between the cap and the piston loading is wired during isotropic consolidation, is guaranteed coaxial piston loading the specimen at the start of the triaxial compression test. Stress-strain relationship can be obtained from the start of loading smooth.
configuration device

You are using a screw jack device capacity of 25kN static loading gear ‡@ formula
Both documentation and programs that can be controlled by the motor speed control unit ‡A Acrylic pressure-resistant cylinder ‡B

High pressure triaxial compression testing machine

The parameters of High Pressure Tri-axial Apparatus
Max. cell Pressure 3.5 MPa@@Max. Back Pressure 1.0 MPa@Max. Axial Load 100 kN@Sample Height 200 mm@Sample Diameter 100 mm

Triaxial compression testing machine temperature control

Overview
one tester. Reproduced in a short time interval in the present apparatus the weathering phenomenon caused by changes in temperature throughout the year. Water in the rock volume expansion and contraction repeatedly by changing the temperature forces. We verified by experiment which component in the rock and how do changes in rock strength is and whether it contributes to weathering by weathering.

Configuration device 2. ‡@
loading apparatus This testing machine uses the system loading gear clutch. We have been adopted motor servo control for loading while maintaining a certain amount of strain. You can control the speed of loading minutes 5mm / from 0.01mm.
Stress-strain measuring device
‡A Maximum load of 20kN load cell installed in the pressure cell. It is also possible to directly measure the strain of the specimen LVDT, the LDT.
‡B
system hot and cold Can be changed from 45 Ž to -6 Ž the temperature by compressor dual function. The temperature control by circulating the liquid in the tube is due to temperature change compressor is installed around the specimen.
‡C data recovery system
Recorded from time to time is supplied to each port digitized voltage values ??that are output from the various transducers by the A / D converter.

Hollow torsional shear testing machine

The hollow torsional shear device applies a combination of axial and torsional stresses while keeping a hollow cylindrical specimen within inside and outside fluid stresses. Torque, vertical force, inner and outer cell pressures are independent, allowing control of direction of principal stresses and application of a wide range of stress paths. During the test, torque (T), axial load (Fv), inner cell pressure (Pi), outer cell pressure (Po), pore water pressure (PWP), volume change in specimen (DV_specimen), volume change in inner cell (DV_inner cell), axial displacement (ĢHi) and rotational angle potentiometer (Į) can be measured.

Shaking Table

Summary tester
Apparatus for carrying out the test model liquefaction under 1G.
Desirable because it is hard to liquefaction stress level is lower than the real ground, and the soil is to tighten the loose. Must be set higher than the actual oscillation frequency may as well.
Placed directly pore water pressure gauge and an accelerometer to record the change in pore water pressure rise and acceleration due to vibration.


device features
Size: 3.0m ~ 2.0m
X,
axis Y: vibration direction 7 t
: maximum load 0 ~ 50Hz
: frequency } 200mm
: maximum strain 27cm / s
: Maximum Speed 1000 Gal
: maximum acceleration

Static indentation device

One. Overview

Apparatus for reproducing the soil chamber and the motor is performed by a hydraulic pile press-fit generally model experiments. Inside the soil chamber has space for installing the load cell to the top and bottom, and now has set up three load cells each, a total of six. Bottom is also space for applying the pressure, in order to reproduce the state of the ground at a depth of a few meters, you can put pressure on also listed.

2.
Configuration device Press fitting constant speed (1) Motor is possible

Possible loading up 1t (9.8kN) load equipment Court (2) Sat stainless steel tank (3). There are three types of space, creating space consisting of space-consuming ground of ƒÓ300 ~ 500, the space of the load cell is installed, air pressure.

Large earth tank for injection test pile group

One. Overview
Experiments using a soil chamber as large as possible. Soil chamber dimensions are 1680mm height 1600mm ~ 1600mm ~ horizontal depth, to create a model of the ground in this height 1200mm. Each member is made of steel of 17mm thick, the amount is about 200ƒÊ up was measured strain in the bottom plate during the loading test in fact, for the external force is sufficient it is given the size of the vessel Sat can be regarded as rigidly.
Because the front wall is made of transparent acrylic plate having a thickness of about 70mm, I can be measured in real time the movement of the ground in the loading test. Observed ground deformation after the test to create and ground model so as to easily consists of channel C-shaped aluminum several steps, rear, must have a high wall in accordance with the height of the soil are filled . Has become stilts to replace the connector for data collection Tactile sensors installed in the tank bottom soil.
2.
Configuration device
Exerted pressure to 200kPa overburden overall by laying a 500mm square airbag airbag overburden pressure (1) Load equipment can be moved vertically and horizontally Court (2). The maximum output › t
Resolution 0.125kN 500kN load (3) Maximum allowable load cell

Point Loading Machine

Point load test (PLT) is the index test and is intended to be used to classify and characterize rock.
This is used as an alternative to uniaxial compression test which is used to determine the compressive strength of a rock specimen.
PLT can be conducted in the different shape of specimen such as rock cores, blocks or irregular lumps. Hence, PLT are more convenient as a much shorter time and less effort for sample preparation are required as compared to the uniaxial compression test. According to ASTM D5731-02, the test is used as an index test for strength classification of rock materials and should not be used for design or analytical purposes. The point load test apparatus installed in this lab is fully automatic gear clutch system. The maximum capacity of motor is 50 KN. Point Load can be applied at the rate of 0.01-0.1 mm/min. The maximum capacity of sensor to record load is 10KN. Data is recorded in computer automatically by software.