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Gravity Wall 

GEO5

Geotechnical software

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Base anchorage

An anchorage of wall footing can be specified for cantilever walls. It is necessary to specify an anchor location, dimensions of a drill hole, and spacing of anchors.

Two limit states of bearing capacity are defined for an anchor – bearing capacity against pulling-out Tp (kN/m) and strength of anchor Rt (kN). Final force is determined as minimum of these forces.

Base anchorageBase anchorage

Bearing capacities can be either input or computed from the input values using the following expressions:

where: Tp - pull-out resistance
d - drill hole diameter
a - ultimate bond
FSp - safety factor against pulling-out

where: RT - strength of anchor
ds - anchor diameter
fy - yield strength of anchor
FST - safety factor against pulling-apart

Approximate values of bearing capacity against pulling-out

Material Ultimate bond
[N/mm2] 		Ultimate strength for specified hole diameter [kN/m]
65 mm 75 mm 90 mm 100 mm 150 mm
Soft shale 0,21 - 0,83 42 - 169 49 - 195 59 - 234 65 - 260 98 - 391
Sandstone 0,83 - 1,73 169 - 350 195 - 407 234 - 486 260 - 543 391 - 562
Slate, Hard Shale 0,86 - 1,38 175 - 281 202 - 325 243 - 390 270 - 433 405 - 562
Soft Limestone 1,00 - 1,52 204 - 310 235 - 358 282 - 429 314 - 477 471 - 562
Granite, Basalt 1,72 - 3,10 351 - 562 405 - 562 486 - 562 540 - 562 562 - 562
Concrete 1,38 - 2,76 281 - 562 325 - 562 390 - 562 433 - 562 562 - 562

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