Download Geotechnical Hazards from Large Earthquakes and Heavy by Hemanta Hazarika, Motoki Kazama, Wei F. Lee PDF

By Hemanta Hazarika, Motoki Kazama, Wei F. Lee

This booklet is a suite of papers awarded on the overseas Workshop on Geotechnical typical 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 risks from huge Earthquakes and Heavy Rainfalls, held below the auspices of the Asian Technical Committee No. three on Geotechnology for average risks of the foreign Society for Soil Mechanics and Geotechnical Engineering. It used to be co-organized by means of the japanese Geotechnical Society and the Taiwanese Geotechnical Society.

The contents of this publication concentrate on geotechnical and common hazard-related concerns in Asia reminiscent of earthquakes, tsunami, rainfall-induced particles flows, slope disasters, and landslides. The e-book comprises the most recent info and mitigation expertise on earthquake- and rainfall-induced geotechnical ordinary dangers. by way of dissemination of the most recent state of the art learn within the quarter, the knowledge contained during this ebook might help researchers, designers, specialists, executive officers, and academicians taken with the mitigation of typical risks. The findings and different details supplied this is anticipated to give a contribution towards the advance of a brand new bankruptcy in catastrophe prevention and mitigation of geotechnical structures.

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The results indicate that the seepage reduced the failure load and that the rate of reduction was large with lower hypothetical adhesion. Figure 13b shows the rates of the failure load versus hypothetical adhesion. The reduction rate rapidly decreased when the hypothetical adhesion approached 0 kN/m2. Considering the reduction rate of 64–77 % in the model test, the hypothetical adhesion of approximately 5 kN/m2 would be suitable to simulate the model test. 36 H. Takahashi et al. (b) 800 100 No seepage Seepage 600 Failure load rate (%) Horizontal load at failure point (kN/m) (a) 400 200 80 64-77% 60 40 20 *Frictional angle: 40 degrees 0 0 5 10 15 20 Hypothetical adhesion (kN/m2 ) *Frictional angle: 40 degrees 0 0 5 10 15 20 Hypothetical adhesion (kN/m2 ) Fig.

Displacement was measured from 50 mm below the top of the caisson. The load and displacement were measured using a cantilever-type load cell and a displacement gauge, respectively. Because a mound represented relaxation behaviour, the caisson was loaded with alternating loads and rests. The load and displacement resulted in a non-linear relationship, indicating plastic deformation behaviour of the mound. 6 m almost became linear, and the starting point of a straight line was considered to be the beginning of the ground’s limit state.

Wakai and S. Goto As seen in the measured particle size distributions of each sample in Fig. 6, both of them are classified as sand containing fines. The fine fraction contents of the ash-fall deposit and the aeolian dust are approximately 20 and 40 %, respectively, that seems the main cause of their difference in the permeability. The in situ properties as well as other physical properties are summarized in Table 1. Here, the ash-fall deposit is so loose that the in situ dry bulk density is smaller than the minimum dry density observed in laboratory.

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