Minas

Shake analysis
Determination of the acceleration due to earthquake at location of the failure surface from the maximum acceleration , a, of the bedrock from the earthquake
5

Pseudostaticanalysis

Horizontal force applied to each slice :mass x a.
If factor of safety >1.0 no yielding – OK
If factor of safety<1.0determine the resulting displacements – may not be significant . OK6
DESCRIPTION

Water
Tailings
Shell/core –saturated , strong
Drainage zone
Shell/core –unsaturated , strong
Shell/core –unsaturated ,weak
Shell/core –saturated , weak
Shell/core–saturated , strong
Shell/core –saturated , weak
Shell/core –saturated , weak
Weathered bedrock
7
Normal operating conditions
8
Post liquefaction- residual strength

9 FILTER RELATIONSHIPSWater flow

Protected soil filter

10 THE IMPORTANCE OF FILTERS

-When water flows from one soil to another the grading of the second material must prevent the erosion of particles from thefirst material

-in Every instance where water flows from one soil type to another , the filter relationship must be verified

-more dams fail from inadequate filter relationships than anyother reason –piping failure
11
12
TAILINGS FACILITIES
13
TAILINGS STORAGE FACILITIES

Liner design
Soil liners
Plastic liners

Hydrology
Monthly rainfall data
Statisticalanalyses
Estimating storm events
Evaporation data

Hydraulic design
Diversion ditches
Spillways
Erosion protection

Tailings distribution
Design of slurry pipelinesTailings distribution pipework

Water management
Water balance calculations
Estimates of makeup water requirements
Estimates of Release /storage volumes
Types of decantsFiling curves and embankment staging

Designing for closure

14
LINER DESIGN

LINERS are necessary when the environmental impact of seepage from the facilities

Types of liner...