For the application of stabilization of rock slopes, ____ is used 

Soil stabilization: 

• Soil stabilization refers to all the processes that aim to enhance the soil’s mechanical properties, increasing its shear strength and, thus, the stability of the slope.
• The most commonly used techniques include mechanical (compaction, dewatering, mixing, etc.) and chemical (lime, cement, fly ash, etc.) stabilization.
• Support stabilization:
  • ​ Structural supports aim to increase the stability of the slope.
  • Those techniques include the implementation of pre-stressed anchors, rock bolts, piles, soil nailing, geosynthetic reinforcement, retaining walls, shotcrete, etc. 
• Water drainage:
  • The presence of water in the soil or the rock mass causes increased pore water pressure.
  • Water pressure weakens the ties between the particles and they tend to slip, a fact that reduces the stability of the slope.
  • Drains are used to reduce water entry and control the groundwater level.
• Removal and protection:
  • ​ Removing the unstable material that usually lies on the upper layer of the slope and placing protection means, (e.g., nets).