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APPENDIX D

RECOMMENDED STANDARD FOR THE WEIGHT SOUNDING TEST (WST)

1. INTRODUCTION

1.1 The Swedish weight-penetrometer con-sists of a screw-shaped point, rods, weights and a handle. It is used as a static pen-etrometer in soft soils when the penetration resistance is less than 1 kN. When the resistance exceeds 1 kN the penetrometer is also rotated and the number of rotations for a given settlement is noted. Its ability to penetrate even in stiff clays and dens sands is good. The penetrometer is primarily used to give a continuous soil profile and an indication of the layer seąuence and to determined the lateral extent of different soil layers. It is also used to determine whether non cohesive soils are loose, medium-dense or dense and to estimate the relative strengths of cohesive soils. The results obtained in non cohesive soils are also used to calculate the bearing capacity of spread footings and piles.

than 32.0 +0.2 mm for a worn point. The diameter shall be checked by circular gauges with different inner diameters.

COUPLING

I--

I I

j i

ROD

2. APPARATUS

2.1    Weights

Fig. 1 Recommended tolerances for manufacture of weight penetrometer rods and couplings.

Maximum allowable shortening of the length of the point is 15 mm due to wear. The tip of the point shall not be bent or broken.

2.1.1    These comprise one 5 kg clamp, two 10 kg weights, three 25 kg weights. Total 100 kg. The weights can be replaced by a dynamometer when the penetrometer is pushed in manually.

2.1.2    The maximim allowable deviation for the weights and the dynamometer scalę is +555.

2.2 Rod and coupling

2.2.1    The diameter of the rod should be

22 mm. Regarding materiał see notę 1 para. 6.

2.2.2    The deviation from the straight axis should not exceed h%* for the lowest 5 m of the rod and 8%. for the remainder. Determi-nation of the deviation for the rods see Fig. 3> Appendix A. Maximum allowable eccen-tricity for the coupling is 0.1 mm. Maximum angular deviation for a joint between two straight rods is 0.005 rad.

2.2.3    Flush joints see Fig. 1.

2.3 Point

2.3.1    Manufactured from a 25 mm square Steel bar with a total length of 0.2 m. The bar has a 80 mm long pyramidal point. It is twisted to the left over a length of 130 mm as shown in Fig. 2.

2.3.2    The diameter of the circumscribed circle of the point shall not exceed 35.0 +0.2 mm for a new point and shall not be less

2.*ł Tools (not standardized)

Two fixed wrenches, a handle, extraction device and augers for preboring.

3. TEST PROCEDURĘ

3.1    Manuał weight sounding

When the penetrometer is used as a static penetrometer in soft soils the test should be madę in accordance with clause 3-1.1 and

3.1.2.    In stiffer soils the penetrometer should be rotated as described in clause

3.1.3.

3.1.1    The rod is loaded in steps using the following standard loads.

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