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Dimensioning of the Internal and External Carrying Capacity
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External Carrying Capacity |
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External Carrying Capacity
For the dimensioning of the load bearing length, L, of the pile and the grout body diameter, D, the external load carrying capacity is critical. It is determined by the ultimate soil friction, qsk, surface of the grout body, and the safety factor, S, to DIN 4128 table 2.
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Type of Soil |
Ultimate Friction, qsk |
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MPa |
kN/m2 |
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medium to coarse gravel1) |
0.20 |
200 |
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sand and gravelly sand1) |
0.15 |
150 |
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cohesive soil2) |
0.10 |
100 |
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1) D >= 0.4 resp. qck >= 10MN/m2 |
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End bearing capacity of CTS/TITAN injection
piles can be ignored. Unless prior tests have proven higher ultimate
friction values in similar soils, the ultimate friction values, qsk,
for friction and compression can be calculated from the values contained
in DIN V 1054-100 table F1, shown to the right.
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Soil Characteristics |
Cu/kN/m2 |
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clay, soft, easily kneadable |
10 - 25 |
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loam, soft |
10 - 25 |
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chalk |
10 - 50 |
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clay |
10 - 20 |
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peat |
5 - 10 |
According to DIN 4128 9.3, calculations for buckling have only to be done if the undrained shear strength of the soil, Cu is below 10 kN/m2. Acc. to E9 of EAU the soil value Cu for cohesive soils to be called critical, is in the box to the right.
<--- Internal Carrying
Capacity
---> Calculation Example
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©Con-Tech Systems 31-May-2005 |
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