Open AccessStudy of negative skin friction on floating piles foundation due to long-term groundwater extraction in Semarang, Indonesia
Author(s) -
Merdeka Sandi Tazakka,
Budiwan Adi Tirta,
Monika Aprianti Popang,
Yulisa Afna Sariska
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/851/1/012025
Subject(s) - pile , geotechnical engineering , extraction (chemistry) , foundation (evidence) , groundwater , settlement (finance) , aquifer , geology , subsidence , environmental science , geography , geomorphology , structural basin , archaeology , chemistry , chromatography , world wide web , computer science , payment
The northern Semarang area is prone to a land subsidence problem as the underlying soil consists of a thick layer of normally consolidated clay which also exacerbated by groundwater extraction to meet water demand. The downdrag impact on a pile structure due to the water extraction from two major aquifers that have been used for domestic consumption was investigated. A 3D-finite element analysis was performed to a raft foundation with steel pipe piles. The study used Banger polder data and soil characteristics based on previous investigations. The evaluation was done by comparing the results of negative skin friction (NSF) and total settlement within 50 years period under continuous extraction and one without. From the result, the corner pile located farthest from the pump mobilized NSF of 64% of the total negative skin friction which was highest than middle and interior-corner piles of 28% and 20%, respectively. The groundwater extraction was also found to contribute to almost double the settlement in 50 years in the non-piled area, from 0.24 m without extraction to 0.42 m accounted for. Also, the empirical 0.75L pile for the maximum neutral point of the pile is in agreement in the result of this study.