Table 7.11.

General application of intrusive investigations

Ground conditionsTrial pitsCable percussiveWindow samplingSoft ground rotary drillingRotary samplingRotosonic drillingCone penetration testProbingHand auger
General soils
Coarse and/or heterogeneous fill/made groundABBUUABBB
Fine homogeneous fill/made groundAAAUUAAAA
Unconsolidated sandsBBB*UUBABB
Unconsolidated gravelABBUUBBBB
Boulders and cobblesABUUUBUUU
Soft sediments (alluvial deposits, marine muds)AAAAUBAAB
Medium Sediments (alluvial deposits, Tertiary age deposits)BBBUAABBU
Specific glacial/periglacial deposits
TillAA*UUAABUU
Over consolidated subglacial tillsBB*UUABUUU
Till sequences of variable consolidationBA*UUAABUU
Waterlain deposits (laminated, varved deposits)AA*ABUBABB
Thick granular glaciofluvial deposits (medium dense to very dense)UB*B*UBUUB/UU
Interbedded diamicton/granular depositsBB*BUABBBU
Slope/massmovement depositsAB*A*UA*ABBB
Solifluction/gelifluction depositsAB*A*UA*ABBB
  • A: method should be suitable; B: method may be suitable depending on working method adopted; U: method is unlikely to be suitable. *Dependent on quality of sample required.