Browsing by Author "O'Neill, MW"

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Comparative behavior of laterally loaded groups of bored and driven piles in cohesionless soil
(2003-09-01)
O'Neill, MW
;
Huang, AB
;
土木工程學系
;
Department of Civil Engineering
The lateral load performance of 2 pile groups, one consisting of driven displacement piles, the other of bored piles, is described. The effect of installing the piles is to reduce the soil stiffness within the bored pile group, making the soil less efficient in resisting lateral pile movements than in the driven pile group. Structurally, however, the bored piles were more resistant to flexural loading. The net effect was that the system of bored piles was stiffer than the system of driven displacement piles.
Effects of construction on laterally loaded pile groups
(2001-05-01)
Huang, AB
;
Hsueh, CK
;
O'Neill, MW
;
Chern, S
;
Chen, C
Full-scale lateral load tests on a group of bored and a group of driven precast piles were carried out as part of a research project for the proposed high-speed rail system in Taiwan. Standard penetration tests, cone penetration tests (CPT), and Marchetti Dilatometer tests (DMT) were performed before the pile installation. The CPT and DMT were also conducted after pile installation. Numerical analyses of the laterally loaded piles were conducted using p-y curves derived from preconstruction and postconstruction DMT and by applying the concept of p multipliers. Comparisons between preconstruction and postconstruction CPT and DMT data and evaluation of the results of computations show that the installation of bored piles softened the surrounding soil, whereas the driven piles caused a densifying effect.