Alternative Title

Shaking Table Tests on Efficiency of New Type of Drains

Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

One method to mitigate liquefaction-induced hazard is the use of a system of vertical drains to dissipate the excess pore water pressure generated by earthquake loading. Performance assessments for these systems require the estimation of vertical drain spacing such that a maximum threshold level of excess pore pressure ratio is not exceeded. The objective of this research is to study efficiency of installing vertical drains on generation and dissipation of pore water pressure. For this purpose series of shaking table tests were performed using a laminar box, in Geotechnical Laboratory on Tokyo University. The ground model consists of two layers of saturated sand with relative densities of 80% and 40%. Two different types of vertical drains were investigated: prefabricated micro drain with diameter 22 mm and gravel drain with diameter of 30 mm. Several shaking table tests were performed with different distribution pattern in order to achieved optimal spacing between vertical drains on dissipation of pore water pressure. The tests were carried out with harmonic loading at frequency of 10 Hz and varying the magnitude of input acceleration in wide range from 0.05 to 0.60 (g). The results from above shaking table tests provided a detail view of efficiency of new type of vertical drains as one of the frequently used remedial measures against liquefaction.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

Share

 
COinS
 
Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Shaking Table Tests on Effiency of New Type of Drains

New York, New York

One method to mitigate liquefaction-induced hazard is the use of a system of vertical drains to dissipate the excess pore water pressure generated by earthquake loading. Performance assessments for these systems require the estimation of vertical drain spacing such that a maximum threshold level of excess pore pressure ratio is not exceeded. The objective of this research is to study efficiency of installing vertical drains on generation and dissipation of pore water pressure. For this purpose series of shaking table tests were performed using a laminar box, in Geotechnical Laboratory on Tokyo University. The ground model consists of two layers of saturated sand with relative densities of 80% and 40%. Two different types of vertical drains were investigated: prefabricated micro drain with diameter 22 mm and gravel drain with diameter of 30 mm. Several shaking table tests were performed with different distribution pattern in order to achieved optimal spacing between vertical drains on dissipation of pore water pressure. The tests were carried out with harmonic loading at frequency of 10 Hz and varying the magnitude of input acceleration in wide range from 0.05 to 0.60 (g). The results from above shaking table tests provided a detail view of efficiency of new type of vertical drains as one of the frequently used remedial measures against liquefaction.