Goodman Jack

Goodman Jack

Applications

The Goodman Jack is a borehole tool used for estimating the deformability of rock masses in-situ. It is designed to be used in 3″ (76 mm) boreholes.

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

Goodman Jack

Operation

The Goodman Jack consists of a hydraulic jack with curved bearing plates, LVDT sensors, a displacement indicator, a hydraulic pump with pressure gauge, hydraulic hose, electrical cable, and a coupler for drill rod.

The jack is attached to drill rod and inserted into the borehole. A hand pump is used to create hydraulic pressure in the lines connected to the jack, which in turn activates the pistons and produces a uniform and unidirectional stress field at the bearing plate. The applied hydraulic pressure is measured with a standard Bourdon-type pressure gauge. The deformation of the rock is measured by two linear variable differential transformers (LVDT) and data are displayed by the indicator at the surface. After the test, the bearing plates are retracted by reversed pistons and the jack is withdrawn from the borehole.

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

For more information

Please download the datasheet and manual for the Goodman Jack. It can be viewed and printed with Adobe Acrobat Reader.

Goodman Jack Specifications

HARD ROCK JACK
Number of Pistons 12
Max Bearing Pressure 64,000 kPa (9,300 psi)
Maximum Force 703 kN (158,100 lbf)
Borehole Size 76 mm, 3" nominal
Minimum Diameter 70 mm (2.75")
Maximum Diameter 83 mm (3.25")
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")
Maximum Hydraulic Pressure 69,000 kPa (10,000 psi)
Operating Temp -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
Dimensions 70 x 445 mm (2.75 x 17.5")
Weight 15 kg (33 lb)
SOFT ROCK JACK
Number of Pistons 3
Max Bearing Pressure 38,200 kPa (5,540 psi)
Maximum Force 419 kN (94,200 lbf)
Borehole Size 76mm, 3" nominal
Minimum Diameter 70 mm (2.75")
Maximum Diameter 83 mm (3.25")
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")
Maximum Hydraulic Pressure 69,000 kPa (10,000 psi)
Operating Temp -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
Dimensions 70 x 445 mm (2.75 x 17.5")
Weight 15 kg (33 lb)
DISPLACEMENT INDICATOR
Display Dual LCDs with 3-digit signed values
Operating Time 10 hours with fully charged batteries
Battery Charger Internal from 115/230 VAC or 10-15 VDC
Temp. Coefficient ±(0.015% Reading +0.001% F.S.) per °C.
±(0.008% Reading +0.0006% F.S.) per °F.
Operating Temp -18 to 49°C (0 to 120 °F)
Resolution 0.01 mm with Metric Indicator.
0.001" with English Indicator
Dimensions 280 x 230 x 180 mm (11 x 9 x 7")
Weight 5 kg (11 lb)
HAND PUMP
Hydraulic Pump Enerpac P-84
Maximum Pressure 69,000 kPa 10,000 psi
Pressure Gauge 50 psi (345 kPa) resolution with accuracy of ±0.5% FS
Dimensions 690 x 180 x 150 mm (27 x 7 x 6")
Weight 13 kg (29 lb). Hose and cable add 10 kg per 15 m (22 lb per 50’)
PART NUMBERS
Goodman Jack, Hard Rock 52100100 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
Goodman Jack, Soft Rock 52100200 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
Displacement Indicator English Unit 52102700
Metric Unit 52102710
Electrical Cable Assembly 52100500 Shielded, multi-conductor cable, waterproof connectors
on each end, 15 m (50’)
Hydraulic Hose Assembly 52100600 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)
Hydraulic Pump, Model P-84 52100700 Two-stage, 10,000 psi (70 MPa), with selector valve
Hydraulic Tee Assembly 52100800 Includes three self-sealing quick-connectors for easily connecting hydraulic hose, pressure gauge and hydraulic pump
Pressure Gauge, Model 200 52100900 Bourdon-type, 4.5" diameter gauge with accuracy of 0.5% and twin tip pointer to eliminate reading errors. Range: 10,000 psi (70 MPa). Other ranges available on request
Hydraulic Oil, HF-101 52102400 Note: Carriers require surcharge and separate documents for air shipments of hydraulic oil
Carrying Case, For Jack 52101500 Wooden carrying case for shipping and storage of Goodman Jack and accessories
Carrying Case, For Pump 52101501 Wooden carrying case for shipping and storage of pump and accessories