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A trial pit is preferred to a borehole where the requirement is to

  • A.reach bedrock at fifty metres or more
  • B.sample below the groundwater table safely
  • C.measure the in situ stress within the rock mass
  • D.examine the ground in place to shallow depth

Answer: D

It exposes the fabric, the fissures and the lateral variation that a borehole core cannot show, and block samples can be cut from it. Its depth is limited by stability and by the water table, so a few metres is the practical limit.

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