A.3.3.5 Partial resistance factors (γR) for retaining structures

(1)P For retaining structure and verifications of structural (STR) and geotechnical (GEO) limit states, set R1, R2 or R3 of the following partial factors on resistance (γR) shall be applied:

  • γR;v on bearing capacity;
  • γR;h on sliding resistance;
  • γR;e on earth resistance.

NOTE The values to be ascribed to γR;v, γR;h and γR;e for use in a country may be found in its National annex to this standard. The recommended values for the three sets R1, R2 and R3 are given in table A.13.

Table A.13 – Partial resistance factors (γR) for retaining structures
Resistance Symbol Set
R1 R2 R3
Bearing capacity γR;v 1,0 1,4 1,0
Sliding resistance γR;h 1,0 1,1 1,0
Earth resistance γR;e 1,0 1,4 1,0

A.3.3.6 Partial resistance factors (γR) for slopes and overall stability

(1)P For slopes and overall stability and verifications of structural (STR) and geotechnical (GEO) limit states a partial factor on ground resistance (γR;e) shall be applied.

NOTE The value to be ascribed to γR;e for use in a country may be found in its National annex to this standard. The recommended value for the three sets R1, R2 and R3 is given in table A.14.

Table A.14 – Partial resistance factors (γR) for slopes and overall stability
Resistance Symbol Set
R1 R2 R3
Earth resistance γR;e 1,0 1,1 1,0

A.4 Partial factors for uplift limit state (UPL) verifications

(1)P For the verification of uplift limit state (UPL) the following partial factors on actions (γF) shall be applied:

  • γG;dst on destabilising unfavourable permanent actions;
  • γG;stb on stabilising favourable permanent actions;
  • γQ;dst on destabilising unfavourable variable actions.

NOTE The values to be ascribed to γG;dst, γG;stb and γQ;dst for use in a country may be found in its

National annex to this standard. The recommended values are given in table A.15.

Table A.15 – Partial factors on actions (γF)
Action Symbol Value
Permanent
Unfavourable a
Favourable b
 
γG;dst
γG;stb
 
1,0
0,9
Variable
Unfavourable a
 
γQ;dst
 
1,5
a Destabilising;
b Stabilising

(2)P For the verification of uplift limit sate (UPL) the following partial factors on soil parameters (γM) shall be applied:

  • γφ' on the tangent of the angle of shearing resistance;
  • γc' on effective cohesion;
  • γcu on undrained shear strength;
  • γs;t on tensile pile resistance;
  • γR on anchorage resistance.

NOTE The values to be ascribed to γφ', γc', γcu, γqu, and γγ for use in a country may be found in its National annex to this standard. The recommended values are given in table A.16.

Table A.16 – Partial factors for soil parameters (γM)
Soil parameter Symbol Value
Angle of Shearing resistance a γφ' 1,25
Effective cohesion γc' 1,25
Undrained shear strength γcu 1,40
Tensile pile resistance γs;t 1,40
Anchorage γR 1,40
a This factor is applied to tan φ'

A.5 Partial factors for hydraulic heave limit state (HYD) verification

(1)P For the verification of hydraulic heave limit state (HYD) the following partial factors on actions (γF) shall be applied:

  • γG;dst on destabilising unfavourable permanent actions;
  • γG;stb on stabilising favourable permanent actions;
  • γQ;dst on destabilising unfavourable variable actions.

NOTE The values to be ascribed to γG;dst, γG;stb and γQ;dst for use in a country may be found in its

National annex to EN 1990:2002. The recommended values are given in table A.17.

Table A.17 – Partial factors on actions (γF)
Action Symbol Value
Permanent
Unfavourable a
Favourable b
 
γG;dst
γG;stb
 
1,35
0,90
Variable
Unfavourable a
 
γQ;dst
 
1,50
a Destabilising
b Stabilising

Eurocode 7 Geotechnical design Part 1 : General rules