The results demonstrate that the new method has improved predictive capability and accuracy in comparison with the conventional method for cases of liquefaction and no liquefaction. The following symbols are used in this paper:cyclic stress ratio for irregular seismic wave;cyclic stress ratio for regular seismic wave;cyclic resistance ratio for regular seismic wave with Nc=20;wave correction coefficient;soil relative density;gravitational acceleration;N-value from standard penetration test;equivalent N-value corresponding to σv0′=65 kPa;number of load cycles with constant-amplitude shear stress;effective number of waves;reference value of Nef;tip resistance from cone penetration test;coefficient of uniformity;excess pore water pressure;shear-wave velocity;equivalent acceleration defined by Eq. L. 1989), the Japanese liquefaction chart was previously shown to compare favorably with those of Seed etal. A. It is necessary to check the accuracy of the wave correction coefficient, cα.
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paper provides an outlook on future directions of research or possible applications. 17. It is seen that, regardless of the presence or absence of the wave corrections, both of the predicted results are generally consistent with the liquefaction and no-liquefaction cases.
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prior to publication. g. 4, together with regular waves, comprising a total of 241 test cases. Closer examination tells us that the predicted results after introducing the wave corrections show higher equivalent accelerations globally and partly approached Zone II with a high possibility of liquefaction.
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The concept of an see this here number of waves was introduced to represent the characteristics of the irregularity of waveforms and the different number of load cycles of irregular seismic motions, as well as their influence on the occurrence of liquefaction.
You are accessing a machine-readable page. Undrained Cyclic Torsional Shear Tests and Constant-Volume Cyclic Simple Shear Tests for Regular and Irregular Seismic Waves, Comprising a Total of 241 Test CasesThe example test results are shown in Fig. Essentially the same degree of accuracy is observed for both theories. For Continued purpose of comparison and subsequent discussion, the liquefaction chart taken from Japanese guidelines (MLIT 2007) is shown in Fig. Regression analysis of Continue observed data led to the following form: Here, Eq.
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In this respect, the results predicted by the new method appear to be more consistent with the field evidence in cases with no liquefaction but a partly near-liquefied state. The authors would like to acknowledge Urayasu City, Japan, for providing the ground data concerning the analysis of the liquefaction at Urayasu City. When you join you get additional benefits. All of the tests were carried out using reconstituted specimens of silica sand with a median grain size D50=0. The recent Canterbury Earthquakes resulted in significant damage to building foundations due to liquefaction and established the importance of estimating the liquefaction potential of the subsoils in order to mitigate the risk of liquefaction induced settlement to building foundations.
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1995). The physical properties of sand soil which give effect to the resistance of liquefaction includegrain size and density. 2001). For
articles published under an open access Creative Common CC BY license, any part of the article may be reused without
permission provided that the original article is clearly cited. Earthquake motions at given sites generally have different waveforms and durations that vary considerably in space and time depending on the characteristics of the sites, routes along which seismic waves propagate, and source rupture process of earthquakes (e. It then concluded that there is a relationship between density and gain sizeparticles associated with liquefaction resistance for certain acceleration of vibration.
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my website The sizes of the hollow cylindrical specimens were 30mm in internal diameter, 70mm in external diameter, and 70mm in height for Series 1, and 60mm in internal diameter, 100mm in external diameter, and 100mm in height for Series 2. ,Aki and Richards 2009). .