TY - GEN
T1 - Instrumented static load test on micropile socketed into limestone
AU - Seo, Hoyoung
AU - Prezzi, Monica
AU - Salgado, Rodrigo
PY - 2014
Y1 - 2014
N2 - Many researchers have investigated the behavior of rock-socketed piles and related the uniaxial compressive strength of "intact" rock to pile shaft resistance without considering rock mass quality. This study presents results from a fully instrumented field-scale load test on a 0.2-m-diameter micropile socketed 4.2 m into limestone layers (2.7 m into weathered limestone and 1.5 m into hard limestone). The results show that practically no base resistance is mobilized until the pile head settlement reaches about 7% of the diameter of the test micropile. The measured limit shaft resistance values are compared with values predicted using methods available in the literature. The comparison indicates that use of the "intact" strength of the rock for estimation of limit shaft resistance may lead to an unconservative design when the rock mass quality is very poor, as indicated by, for example, low RQD values.
AB - Many researchers have investigated the behavior of rock-socketed piles and related the uniaxial compressive strength of "intact" rock to pile shaft resistance without considering rock mass quality. This study presents results from a fully instrumented field-scale load test on a 0.2-m-diameter micropile socketed 4.2 m into limestone layers (2.7 m into weathered limestone and 1.5 m into hard limestone). The results show that practically no base resistance is mobilized until the pile head settlement reaches about 7% of the diameter of the test micropile. The measured limit shaft resistance values are compared with values predicted using methods available in the literature. The comparison indicates that use of the "intact" strength of the rock for estimation of limit shaft resistance may lead to an unconservative design when the rock mass quality is very poor, as indicated by, for example, low RQD values.
UR - http://www.scopus.com/inward/record.url?scp=84906832027&partnerID=8YFLogxK
U2 - 10.1061/9780784413272.055
DO - 10.1061/9780784413272.055
M3 - Conference contribution
AN - SCOPUS:84906832027
SN - 9780784413272
T3 - Geotechnical Special Publication
SP - 572
EP - 581
BT - Geo-Congress 2014 Technical Papers
PB - American Society of Civil Engineers (ASCE)
T2 - 2014 Congress on Geo-Characterization and Modeling for Sustainability, Geo-Congress 2014
Y2 - 23 February 2014 through 26 February 2014
ER -