NEGATIVE PORE AIR PRESSURE GENERATION IN BACKFILL OF RETAINING WALLS DURING EARTHQUAKES AND ITS EFFECT ON SEISMIC EARTH PRESSURE

被引:7
作者
Koseki, Junichi [1 ]
Kimhor, Hong [2 ]
Nakajima, Susumu [3 ]
Mulmi, Sarju
Watanabe, Kenji [4 ]
Tateyama, Masaru [4 ]
机构
[1] Univ Tokyo, Inst Ind Sci, Tokyo 1138654, Japan
[2] ProbeAce Co Ltd, Tokyo, Japan
[3] Publ Works Res Inst, Tsukuba, Ibaraki, Japan
[4] Railway Tech Res Inst, Tokyo, Japan
关键词
backfill; earth pressure; (pore air pressure); reinforced soil; retaining wall; shaking table test; TESTS;
D O I
10.3208/sandf.50.747
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
In order to investigate the seismic behavior of conventional type and geosynthetic-reinforced soil retaining walls, 1-g model shaking tests were conducted. Model walls having a height of about 50 cm were placed on a subsoil layer and backfilled with a layer of dense dry Toyoura sand. They were subjected to several steps of horizontal irregular excitations. As a result, generation of negative pore air pressure in the backfill was observed. The maximum amplitude of the negative pore air pressure during each shaking step increased with the base acceleration. Based on analyses of the measured data, it was inferred that such negative pore air pressure was caused by outward wall displacement relative to the backfill and not by dilative behavior of the backfill. It would cause a reduction in the seismic earth pressures exerted from the backfill. This feature suggests an advantage of a rigid full-height facing for reinforced soil walls over the segmental types of facing. A simplified numerical procedure to evaluate earth pressure was applied while considering the effects of the negative pore air pressure, and it could qualitatively simulate the measured behavior in terms of the seismic earth pressure and the angle of failure plane in the backfill.
引用
收藏
页码:747 / 755
页数:9
相关论文
共 16 条
[1]  
HONG K, 2008, P 10 INT SUMM S INT, P129
[2]  
Japan Road Association, 2002, SPEC HIGHW BRIDG E 1, P65
[3]  
KOSEKI J, 2008, SEISAN KENKYU, V60, P53
[4]  
KOSEKI J, 2007, P 13 AS REG C SOIL M, V2, P222
[5]  
Koseki J., 1998, SOILS FDN SPECIAL IS, V2, P209
[6]   Shaking table tests and analyses of geosynthetic-reinforced soil retaining walls [J].
Matsuo, O ;
Tsutsumi, T ;
Yokoyama, K ;
Saito, Y .
GEOSYNTHETICS INTERNATIONAL, 1998, 5 (1-2) :97-126
[7]  
Mononobe N., 1929, P WORLD ENG C, V9, P179, DOI DOI 10.1142/S1793431108000256
[8]  
NAKAJIMA S, 2010, SOILS FOUND, V50, P639
[9]  
Nakajima S., 2007, International Workshop on Earthquake Hazards and Mitigations, P319, DOI [10.1115/DETC2007-35649, DOI 10.1115/DETC2007-35649]
[10]   A SIMPLIFIED PROCEDURE TO EVALUATE EARTHQUAKE-INDUCED RESIDUAL DISPLACEMENTS OF CONVENTIONAL TYPE RETAINING WALLS [J].
Nakajima, Susumu ;
Koseki, Junichi ;
Watanabe, Kenji ;
Tateyama, Masaru .
SOILS AND FOUNDATIONS, 2009, 49 (02) :287-303