TY - JOUR
T1 - Direct evaluation of effectiveness of prefabricated vertical drains in liquefiable sand
AU - Chang, Wen Jong
AU - Rathje, Ellen M.
AU - Stokoe, Kenneth H.
AU - Cox, Brady R.
N1 - Funding Information:
Financial support was provided by the National Science Foundation under the CAREER award CMS-9875430 and grant CMS-9973717. This support is gratefully acknowledged. The authors wish to thank Dr Robert Goughnour and Mr Jimmy Foster of Nilex Inc. for providing the drain material and advice during testing.
PY - 2004/10
Y1 - 2004/10
N2 - A dynamic full scale testing program was performed to quantitatively assess the effectiveness of prefabricated vertical drains as a liquefaction countermeasure. The testing program involved a new in situ liquefaction testing technique, which uses a large hydraulic vibrator to generate waves propagating through an embedded instrumentation area to measure the coupled soil-pore water response. The effectiveness of prefabricated vertical drains is assessed experimentally by comparing the pore pressure generation, pore pressure dissipation, and settlement from two reconstituted soil specimens; one without a drain in place and the other with a single drain installed. Because the prefabricated drain was installed during the specimen preparation process, no accompanying densification during installation occurred. Therefore, the effect of drainage alone was evaluated. The testing results show that the drainage provided by prefabricated drains can significantly reduce pore pressure generation, accelerate post-shaking pore pressure dissipation, and limit associated settlement. The outcome also shows that the new developed in situ liquefaction testing technique can be an alternative to quantitatively evaluate the effects of various liquefaction remediation techniques.
AB - A dynamic full scale testing program was performed to quantitatively assess the effectiveness of prefabricated vertical drains as a liquefaction countermeasure. The testing program involved a new in situ liquefaction testing technique, which uses a large hydraulic vibrator to generate waves propagating through an embedded instrumentation area to measure the coupled soil-pore water response. The effectiveness of prefabricated vertical drains is assessed experimentally by comparing the pore pressure generation, pore pressure dissipation, and settlement from two reconstituted soil specimens; one without a drain in place and the other with a single drain installed. Because the prefabricated drain was installed during the specimen preparation process, no accompanying densification during installation occurred. Therefore, the effect of drainage alone was evaluated. The testing results show that the drainage provided by prefabricated drains can significantly reduce pore pressure generation, accelerate post-shaking pore pressure dissipation, and limit associated settlement. The outcome also shows that the new developed in situ liquefaction testing technique can be an alternative to quantitatively evaluate the effects of various liquefaction remediation techniques.
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U2 - 10.1016/j.soildyn.2004.06.007
DO - 10.1016/j.soildyn.2004.06.007
M3 - Article
AN - SCOPUS:4143115576
SN - 0267-7261
VL - 24
SP - 723
EP - 731
JO - Soil Dynamics and Earthquake Engineering
JF - Soil Dynamics and Earthquake Engineering
IS - 9-10
ER -