• Goodman Jack
SL52100100

Goodman Jack

  • DGSI - 52100100 - 52100200

The Goodman Jack is used for in-situ investigations of the deformability of rock masses. It is designed to be used in 3" (76 mm) boreholes.

Two models are available: a twelvepiston model for use in hard rock, and a three-piston model for determining the consolidation-time properties of soft rock, soil, and stiff clays.

OPERATION

The Goodman Jack is coupled to the drill rod and inserted into the borehole, along with its hydraulic lines and signal cable. When the jack is in position, a hand pump is used to activate the pistons within the jack. The pistons push a curved bearing plate against the borehole wall, producing a uniform, uni-directional stress field.

The applied pressure is measured with a pressure gauge, and the deformation of the rock is measured by two linear variable differential transformers (LVDT). The indicator displays the LVDT readings. After the test, the bearing plates are retracted and the jack is withdrawn from the borehole.

The modulus of deformation is calculated using formulae derived empirically from in-situ testing. Then correction factors are applied, using factors that were developed by laboratory testing.

 

CAT. NO. DESCRIPTION
SL52100100 Goodman Jack, Hard Rock - Hydraulic borehole probe for in situ tests in hard rock. Includes two LVDT displacement transducers, waterproof electrical connector, two selfsealing hydraulic quick-connectors, and threaded BX adapter.
SL52100200 Goodman Jack, Soft Rock - Hydraulic borehole probe for in situ tests in soft rock. Includes two LVDT displacement transducers, waterproof electrical connector, two selfsealing hydraulic quick-connectors, and threaded BX adapter.
SL52102700 Displacement Indicator (English Unit) - Portable instrument for indicating displacement of the instruments bearing plates. Two illuminated LCDs for reading both LVDT sensors simultaneously. Includes 6-foot jumper cable, rechargeable internal battery, and cable for 110-volt AC operation.
SL52102710 Displacement Indicator (Metric Unit) - Portable instrument for indicating displacement of the instruments bearing plates. Two illuminated LCDs for reading both LVDT sensors simultaneously. Includes 6-foot jumper cable, rechargeable internal battery, and cable for 110-volt AC operation.
SL52100500 Electrical Cable Assembly - Shielded, multi-conductor cable, waterproof connectors on each end, 15 m (50’)
SL52100600 Hydraulic Hose Assembly - High Pressure Hydraulic Hose, 1/4-inch (6.4 mm.) I.D., double steel wire braid, SAE 100R2 Type A, with self-sealing quick-connectors each end, 50 ft (15 m). Note: Operation of Goodman Jack requires two hydraulic hoses, one for expansion and one for retraction of pressure plates.
SL52100700 Hydraulic Pump, Model P-84 - Two-stage, 10,000 psi (70 MPa),
with selector valve.
SL52100800 Hydraulic Tee Assembly - Includes three self-sealing quick-connectors for easily connecting hydraulic hose, pressure gauge and hydraulic pump.
SL52100900 Pressure Gauge, Model 200 - Bourdon-type, 4.5" diameter gauge with accuracy of 0.25% and twin tip pointer to eliminate reading errors. Range: 10,000 psi (70 MPa). Other ranges available on request.
SL52102400 Hydraulic Oil, HF-101 - Note: Carriers require surcharge and separate documents for air shipments of hydraulic oil.
SL52101500 Carrying Case, For Jack - Wooden carrying case for shipping and storage of Goodman Jack and accessories.
SL52101501 Carrying Case, For Pump - Wooden carrying case for shipping and storage of pump and accessories.
  Hard Rock Jack Soft Rock Jack
Number of Pistons 12 3
Max Bearing Pressure 64,000 kPa (9,300 psi) 38,200 kPa (5,540 psi)
Maximum Force 703 kN (158,100 lbf) 419 kN (94,200 lbf)
Borehole Size 76 mm, 3" nominal 76mm, 3" nominal
Minimum Diameter 70 mm (2.75") 83 mm (3.25")
Maximum Diameter 83 mm (3.25") 70 mm (2.75")
Linearity
  • ±0.5% for range of 73.7 to 78.7 mm (2.9 to 3.1")
  • ±1% for range of 72.4 to 80 mm (2.875 to 3.15")
  • ±0.5% for range of 73.7 to 78.7 mm (2.9 to 3.1")
  • ±1% for range of 72.4 to 80 mm (2.875 to 3.15")
Maximum Hydraulic Pressure 69,000 kPa (10,000 psi) 69,000 kPa (10,000 psi).
Operating Temp -32 to 60 °C (-25 to 140 °F) -32 to 60 °C (-25 to 140 °F).
Temp. Coefficient
  • ±(0.04% Reading + 0.02% FS) per °C
  • ±(0.02% Reading + 0.01% FS) per °F
  • ±(0.04% Reading + 0.02% FS) per °C.
  • ±(0.02% Reading + 0.01% FS) per °F.
Dimensions 70 x 445 mm (2.75 x 17.5") 70 x 445 mm (2.75 x 17.5")
Weight 15 kg (33 lb) 15 kg (33 lb)