Design resistance of shallow foundations according to Eurocode 7 NF P94-261. PLQ allows calculating the design resistance of shallow foundations from Menard-type pressiometric tests and static penetrometric tests.
The Menard-type pressiometric test involves introducing a cylindrical probe into the borehole and expanding it radially against the walls of the borehole, measuring the resulting volumetric deformation of the soil. The test is performed under load control by measuring the volumetric deformation corresponding to each load increment.
The static penetrometric test involves pressing a conical tip with sensors into the soil, connected to a data acquisition system.
Calculation of design resistance of shallow foundations according to Eurocode 7 NF P94-261
PQL allows calculating the design resistance of shallow foundations from the results of Menard-type pressuremeter tests and static cone penetration tests.
Menard-type pressuremeter test
It consists of introducing a cylindrical probe into the borehole and expanding it radially against the borehole walls, measuring the resulting volumetric deformation of the soil. The test is performed under load control by measuring the volumetric deformation corresponding to each load increment.
Pressuremeter method
Pressuremeter tests (PMT) are load tests carried out by installing an expandable cylindrical probe in the ground at a given depth, expanding it gradually and simultaneously measuring pressures and deformations. The net ultimate bearing capacity is determined as:
Qnet=Kp*ple*iβ*iδ
Where
- kp: pressuremeter bearing capacity factor;
- ple*: equivalent net limit pressure;
- iδ: load inclination reduction factor;
- iβ: slope inclination reduction factor.
Static penetrometer method
The static cone penetration test (CPT) consists of pushing a conical tip equipped with sensors into the ground, connected to a data acquisition system.
The penetrometer method uses the cone resistance values of the static penetrometer. The net ultimate bearing capacity is determined as:
Qnet=Kc*qce*iβ*iδ
Con
- kp: penetrometer bearing capacity factor;
- qce: equivalent cone resistance;
- iδ: bearing capacity reduction factor due to load inclination;
- iβ: bearing capacity reduction factor due to slope inclination.
For both methods, the guidelines of Eurocode 7 (NF P94-261) have been followed for the design resistance.