By Hemanta Hazarika, Motoki Kazama, Wei F. Lee
This publication is a suite of papers awarded on the foreign Workshop on Geotechnical common dangers held July 12–15, 2014, in Kitakyushu, Japan. The workshop was once the 6th within the sequence of Japan–Taiwan Joint Workshops on Geotechnical dangers from huge Earthquakes and Heavy Rainfalls, held less than the auspices of the Asian Technical Committee No. three on Geotechnology for average risks of the overseas Society for Soil Mechanics and Geotechnical Engineering. It used to be co-organized by way of the japanese Geotechnical Society and the Taiwanese Geotechnical Society.
The contents of this e-book specialise in geotechnical and typical hazard-related concerns in Asia akin to earthquakes, tsunami, rainfall-induced particles flows, slope mess ups, and landslides. The e-book comprises the most recent info and mitigation expertise on earthquake- and rainfall-induced geotechnical traditional dangers. by way of dissemination of the most recent cutting-edge examine within the region, the knowledge contained during this booklet might help researchers, designers, experts, executive officers, and academicians interested in the mitigation of usual dangers. The findings and different details supplied here's anticipated to give a contribution towards the improvement of a brand new bankruptcy in catastrophe prevention and mitigation of geotechnical structures.
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Example text
Because liquefaction did not occur at the improved grounds, the lower limit of Na-value is around 15, according to the figure. Figure 7 shows the relationship between the maximum shear stress ratio and corrected N-values in the improved grounds where liquefaction did not occur. It can be argued that the liquefaction resistance curve of the improved grounds is best represented by the dashed curve, which is on the left side of the curve proposed by JRA (1996). Thus, it is inferred that the liquefaction resistance of the improved ground is higher than that of the natural ground, even though both grounds have the same N-values.
The present paper describes bearing capacity properties of a mound under seepage, by using centrifuge model tests and numerical analyses. Two types of model tests were conducted: horizontal load tests and combined tests with horizontal load and seepage flow. The former ones were to investigate the bearing capacity of a mound without seepage force, and the latter ones were to assess the reduction of bearing capacity of a mound under seepage force. That part of the experiment was written based on Takahashi et al.
12a. Figure 12b shows the friction angles, ϕ0, based on the triaxial tests conducted by Kobayashi et al. (1987) and Mizukami and Kobayashi (1991). Additionally, the figure indicates that the hypothetical adhesion of 20 kN/m2 overestimates the shear strength under low confining pressure. In the present study, the friction angle in the mound (Area 1) shown in Fig. 10 was fixed to 40°, and the hypothetical adhesion was changed. The shear strength of only one section of the mound was changed to account for the high hypothetical adhesion in the mound (Area 2), in which the confining pressure was high even under seepage.