1

ROCKFALL FENCE DESIGN

1. Data Analysis

Confidence limit: statistical approach on the 95%

Average trajectories inclination °

Tollerance of the barrier inclination [ β ] = °

Trajectory height for 95% of the cases [ Hv ] = [ m ]

Trajectory height on the barrier plane [ Ht ] = [ m ]

Min. distance between barrier and infrastructures [ Di ] = [ m ]

Velocity (translational) [ Vt ] = [ m/s ]

Size [ St ] =

Density of Rock [ W ] =

2. Design Coefficient

Quality of topographic survey

Quality of geomechanical survey - size

Quality of geomechanical survey - density

Quality of rock fall simulation

Low economical value and can easily repaired [ i ] =

Reduction coefficient of the barrier energy

Deformation safety coefficient

3. Design Trajectory

Design trajectory velocity [Vd] = 0 [m/s]

Design trajectory mass [Md] = 0 [kg]

Design trajectory height [Hd] = 0 [m]

Design trajectory energy [Ed] = 0 [kJ]

4. Barrier Specification

Maximum energy according to ETAG 027 [MEL] = [kJ]

Service energy level according to ETAG 027 [SEL] = [kJ]

Maximum dynamic elongation MEL [Db] = [m]

[ α ] =

[ m3 ]

[ kg/m3 ]

[ gtt ] =

[ gtg ] =

[ gtw ] =

[ gtr ] =

[ gEN ] =

[ gDB ] =

2

Standard height of the barrier [Hb] = [m]

Upper free border for design boulder [Fb] = [m]

5. Design Method

Design procedure aimed to (MEL or SEL) SEL

Maximum Energy Level 2800

6. Design Performance

Design energy [ E ] = #DIV/0! [ kJ ]

Design elongation [ D ] = 0 [ m ]

Design height [ H ] = 0 [ m ]

7. Proof Barrier

#DIV/0! #DIV/0!

Elongation proof [(D - Di) ≤ 0 ] 0 Fulfilled

Height proof [(Hd - H) ≤ 0 ] 0 Fulfilled

[ EBTE ] =

Energy proof [(Ed - E) ≤ 0 ]