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 After the test, the bearing plates are retracted and the jack is withdrawn from the borehole.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 |
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| 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 |
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| 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) |
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