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American Society for Testing and Materials

Statistics and Data Analysis in Geology

Discrete particle simulation of particulate systems: A review of major applications and findings


 The spectral ratio between horizontal and vertical components (H/V ratio) of microtremors measured at the ground surface has been used to estimate fundamental periods and amplification factors of a site, although this technique lacks theoretical background. The aim of this article is to formulate the H/V technique in terms of the characteristics of Rayleigh and Love waves, and to contribute to improve the technique. The improvement includes use of not only peaks but also troughs in the H/V ratio for reliable estimation of the period and use of a newly proposed smoothing function for better estimation of the amplification factor. The formulation leads to a simple formula for the amplification factor expressed with the H/V ratio. With microtremor data measured at 546 junior high schools in 23 wards of Tokyo, the improved technique is applied to mapping site periods and amplification factors in the area.

Ground Motion Characteristics Estimated from Spectral Ratio between Horizontal and Verticcl Components of Mietremors.

A review of the recent advances on the treatment of industrial wastewaters by Sulfate Radical-based Advanced Oxidation Processes (SR-AOPs)

\n This paper revisits the water resource scenario in India and presents the adequacy of the coastal reservoir concept to address water scarcity by impounding excess river flood waters. Although there has been no significant change in India's rainfall pattern in the last 100 years, there is a spatial non-uniformity in the rainfall events that occur which makes it difficult to pre-plan large-scale water storage at different locations. This study highlights the fact that there is enough water available but the deficiency is in storage. A large portion of freshwater from river systems, groundwater and wetlands drains into the sea due to insufficient storage facilities. Coastal reservoirs enable the storage of excess river flood waters near the coast for future use. This paper discusses current water supply solutions available in the country, and the efficacy of coastal reservoirs along with feasibility implications. The associated rewards and challenges are also discussed. The paper presents details of existing coastal reservoirs worldwide and recent feasibility studies envisaging coastal reservoirs in India.

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Coastal reservoir strategy to enhance India's freshwater storage by impounding river flood waters: A detailed overview

Seismic Hazard Analyses of Bangalore city has been done based on the local soil conditions using a geotechnical data. Seismic hazard analyses parameters are evaluated in terms of amplification rating, peak ground acceleration and factor of safety against liquefaction by considering hypothetical earthquake. Amplification rating is done based on soil profiles by using Finn (1991) recommendation. The peak horizontal ground acceleration in Bangalore is predicted using Boore. et. al (1994). The theoretical PGA curve was developed using different methods by considering Ramanagara fault, which is about 48Km away from Bangalore. The factor of safety against liquefaction was determined using Seed and Idriss (1983) simplified approach. The seismic hazard maps for these three parameters have been prepared in 2-dimension by using AutoCAD and Geographic Information System (GIS), ARCINFO packages. The seismic hazard maps of amplification rating, peak horizontal ground acceleration and factor of safety against liquefaction by considering earthquake magnitude 6 and 7 in Richter scale have been prepared for Bangalore city. These seismic hazards maps are the first level microzonation maps for Bangalore city.

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Seismic hazard studies using geotechnical borehole data and gis

A qualitative understanding of the liquefaction process and the pore water pressure generation in sandy soils has considerably enhanced by various researchers for the last few decades. Laboratory i...

Numerical simulation of liquefaction and pore pressure generation in granular materials using DEM

This paper presents the results of the detailed studies on stress - controlled cyclic triaxial tests on sandy soils from Ahmedabad, Gujarat, India subjected to a loading frequency of 0.1 Hz in cyclic triaxial equipment. Undrained stress controlled cyclic triaxial tests were carried out on cylindrical samples of size 50 mm diameter and height 100 mm with different cyclic stress ratios. Laboratory evaluations were carried out to compare the cyclic resistance of clean sand to that of sand with various fines contents at a constant gross void ratio. The gross void ratio considers the voids formed by sand particles and fines. The effects of gross void ratio with and without fines on pore water pressure build up and liquefaction potential of sandy soils in stress controlled tests are presented. The results obtained from this study provide direct evidence that the limiting silt content plays an important role in the cyclic resistance of sandy soils. Below the limiting silt content the cyclic resistance decreases until the limiting silt content is reached and then the cyclic resistance increases.

Effect of Non-Plastic Fines on Cyclic Behaviour of Sandy Soils

This chapter highlights the significance of Ground Motion Prediction Equations to estimate the seismic hazard at a region based on earthquake magnitude and source to site distance. A glimpse of both deterministic and probabilistic approaches for hazard assessment is presented along with a discussion on the logic tree framework. This chapter also discuss seismic hazard case studies for India as reported by various researchers.

T. G. Sitharam

Papers

Coastal reservoir strategy to enhance India's freshwater storage by impounding river flood waters: A detailed overview

Seismic hazard studies using geotechnical borehole data and gis

Numerical simulation of liquefaction and pore pressure generation in granular materials using DEM

Effect of Non-Plastic Fines on Cyclic Behaviour of Sandy Soils

Seismic Hazard Analysis