A powerful, fast and user-friendly program for assessing and stability of both circular and noncircular slip surface in natural and man-made slopes.
SLOPE models up to mine different soil layers with multiple water tables or piezometric surface, submerge slopes, tension cracks, surcharges and anchor loads. Reinforced earth
and earthquake forces can be modelled, with earthquake accelerations being analysed as
equivalent static forces.
SLOPE can analyse the stability of earth embankments and slopes reinforced with layers of
mesh fabrics or strips.

Key Features

• Analyses natural and cut slopes
• Designs reinforced earth slopes, embankments and walls
• Automatically generates slip surfaces to find the critical failure mechanism
• Surcharges and anchor loads modelled
• Multiple water tables or piezometric surfaces modelled
• Choice of circular slip surfaces or wedge analysis
• Earthquake forces modelled
• Graphical output of data and results
• Designs the optimum arrangement of reinforcement. Choice of fabric, g rid or strip reinforcement or soil nails

Circular and Non-Circula Slip Surfaces

Circular and non-circular slip surfaces can be analysed. Circles can be made to pass
through a common point or touch a common tangent being horizontal or inclined. The
grid of centres may be extended automatically to find the minimum factor of safety
Two and three part wedges can be analysed. A group of wedges can be analysed by defining a rectangular grid of wedge nodes.
Non-circular slip surfaces can be of general shape or may be simple two or three part
wedge.

Methods of Analysis

• Swedish Circle (or Fellenius') method
• Bishop Simplified Method
• Spencer's method—Inclined interslice method
• Janbu's method -Horizontal interslice forces
• Janbu's method –Inclined interslice forces
Factor of safety calculated by inclined interslice force methods are very similar to those obtained by the Morgenstern Price method

SLOPE provide an option to calculate the factor of safety with respect to
• strength of the soil
• strength of the reinforcement
• surcharge loads
• bearing capacity problems
• earth pressure calculations

Ground Water Conditions

Pore pressures are calculated from the position of the water table . Local values of pore pressure can be defined for more complicated flow conditions (e.g. the presence of an aquifer or pore pressures due to construction). Perched water tables and artesian pressures can be modelled.
Pore pressures in any individual stratum can be expressed as an Ru value. Submerged slopes can be analysed by specifying a water table above ground level.

Surface Loads & Earthquake force

Vertical and Horizontal forces may be applied to selected area of the ground surface. External forces (due to buildings or strut forces in excavations) can be applied to the ground surface.
Earthquake forces can be modelled in a quasistatic manner by specifying horizontal and
vertical acceleration factors.
For bearing capacity problems the factor of safety may be calculated as the load factor required to produce failure

Soil Reinforcement

The program selects appropriate types, lengths and spacing of reinforcement layers to achieve a required Factor of Safety for both internal and external stability of the given slope profile.
The stabilising effect of the reinforcement is calculated according to Department of Transport Technical Memorandum BE 3/78 and BS8006.
The factor of safety for a reinforced soil slope is calculated taking into account the combined restoring effect of reinforcement and soil strength. Soil and reinforcement strengths may be partially factored to produce balanced designs in accordance with code requirements. Partial factors may also be applied to surcharge loads
and soil weight.
The Factor of Safety calculation allows the user to specify a certain amount of interslice friction which leads to safe but more economical designs.
The program deals with three main types of reinforcement:
• Sheet or grid reinforcement
• Strip reinforcement.
• Soil Nails
The program includes a data base of properties of some commonly available types of reinforcement