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Skin Friction of the Micropile Root

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

Soil

Skin friction [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 naturally 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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