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Micropile 

GEO5

Geotechnical software

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Skin friction of the micropile root

Reference values of limit skin friction (recommend by the authors)

Soil Skin frition [kPa]
soft clay 40 – 60
stiff clay 65 - 85
solid clay 130 – 170
sand naturally wet, loose 110 – 150
sand naturally wet, medium dense 140 – 180
sand maturally wet, dense 170 – 230
aquiferous sand, loose 80 – 130
aquiferous sand, medium dense 120 – 160
aquiferous sand, dense 160 – 200
sandy clay, soft 50 – 70
sandy clay, stiff 75 – 95
sandy clay, solid 125 – 165
clayey sand, wet, loose 90 – 135
clayey sand, wet, medium dense 135 – 165
clayey sand, wet, dense 150 – 170
clayey sand, aquiferous, loose 80 – 105
clayey sand, aquiferous, medium dense 90 – 130
clayey sand, aquiferous, dense 115 – 155


Values of limit skin friction according to DIN 4128

Soil Average limit skin friction
piles in compression [kPa] piles in tension [kPa]
medium to coarse-grain sand 200 100
sand and gravel sand 150 80
cohesive soils 100 50

Recommended parameters of anchor roots (Mišove, Klein, Inženýrské stavby 5/1986)

Type of support of micropile in head Final
grouting
press. [MPa] 		Number of
groutings 		Root diameter
[mm] 		Root length
[m] 		Skin friction
[kPa]
bedrock - 0 120 5-3 1000-1600
semirock 0,5-3,0 0-1 120-220 7-3 300-1000
gravel, injectable soils 1,0 1-2 250-400 7-5 250-320
gravel, non-injectable soils 2,0-4,0 1-2 280-350 7-5 230
medium and fine-grain sand 1,5-4,0 2-3 220-350 12-7 150-180
cohesive stiff and solid soils 1,5-3,0 1-3 200-280 17-8 130-190
cohesive solid to rigid plastic soils 1,0-2,5 2-3 150-400 20-9 100-130
cohesive soft plastic soils 0,5-2,0 3-4 300-450 27-13,5 50-70

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