Research on Interaction Mechanisms Between Expansive Soils and Water Well Drilling Rig

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Three major interaction mechanisms revealed through laboratory tests:water well drilling rig

 

  1. Hydraulic coupling effect:
    Mud pressure increases pore water pressure in expansive soils, raising swelling force by 20%–30%.
  2. Thermal effect:
    Bit friction generates heat (temperature rise up to 40℃), intensifying soil shrinkage.
  3. Mechanical disturbance effect:
    Drill tool vibration destroys soil structure, reducing cohesion by 40%.

Bx-300S-Type-Circulation-Expansion-Slide-Bar-Water-Well-Drilling-Rig

Numerical simulations show their combined action reduces borehole wall safety factor by 58%.water well drilling rig