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Verification Load Testing of Micropiles under Combined Axial and Lateral Forces
Micropiles were installed at a school site in California to underpin an existing building to mitigate liquefaction hazards. The micropiles were 244 mm (9-5/8 inch) diameter. They were installed through predominately silty and clayey strata with intermittent sand lenses and drilled to a gravel layer approximately 21.3 m (70 ft) below the ground surface. They were grouted under pressure to create an end-bearing zone in the gravel layer. Because of seismic concerns, the regulatory agency (DSA) required that verification tests be conducted under combined lateral and axial loading. Full scale pile load testing under combined axial and lateral loads is sparsely recorded in the literature. A case history is presented including the results of the combined tests on three of the micropiles. The tests were conducted with the piles loaded to 222 kN (50 kips) axial load, then subjected to 40 kN (9 kips) of lateral force (200 percent of superstructure design load for each). Reaction pile movements were also recorded; therefore, conclusions about the relative effects of each force may be drawn.
Verification Load Testing of Micropiles under Combined Axial and Lateral Forces
Micropiles were installed at a school site in California to underpin an existing building to mitigate liquefaction hazards. The micropiles were 244 mm (9-5/8 inch) diameter. They were installed through predominately silty and clayey strata with intermittent sand lenses and drilled to a gravel layer approximately 21.3 m (70 ft) below the ground surface. They were grouted under pressure to create an end-bearing zone in the gravel layer. Because of seismic concerns, the regulatory agency (DSA) required that verification tests be conducted under combined lateral and axial loading. Full scale pile load testing under combined axial and lateral loads is sparsely recorded in the literature. A case history is presented including the results of the combined tests on three of the micropiles. The tests were conducted with the piles loaded to 222 kN (50 kips) axial load, then subjected to 40 kN (9 kips) of lateral force (200 percent of superstructure design load for each). Reaction pile movements were also recorded; therefore, conclusions about the relative effects of each force may be drawn.
Verification Load Testing of Micropiles under Combined Axial and Lateral Forces
Schultz, John Montgomery (author) / Jafroudi, Siamak (author) / Van Nguyen, Thang (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 284-298
2019-03-21
Conference paper
Electronic Resource
English
Verification Load Testing of Micropiles under Combined Axial and Lateral Forces
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