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ANBAZHAGAN, P.
- Effective Depth of Soil Column for Site Response Analysis of Deep Soil Sites
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Authors
Affiliations
1 School of Civil Engineering LPU, Jalandhar, Punjab − 144411, IN
2 Department of Civil Engineering, IISc, C V Raman Ave, Devasandra Layout, Bangalore − 560012, Karnataka, IN
1 School of Civil Engineering LPU, Jalandhar, Punjab − 144411, IN
2 Department of Civil Engineering, IISc, C V Raman Ave, Devasandra Layout, Bangalore − 560012, Karnataka, IN
Source
Indian Journal of Science and Technology, Vol 9, No 44 (2016), Pagination:Abstract
Background: Seismic site response analyses are routinely performed for shallow soil deposits. In the seismic site response studies, depth of input motion which is also called as the depth of half-space or bedrock and is one of the important parameters which influence the amplification and attenuation characteristics of any particular site. Objectives: Finding the exact location of bedrock for deep soil deposits is difficult and uneconomical. Hence, there is a need to identify the effective depth of soil column for deep soil sites to get representative site response parameters. Statistical Analysis: In the present study, recorded bedrock and surface earthquake data with soil profiles is used to identify the matching modulus and damping curves for widely available deep soil types and investigated the depth of half-space for site response study of deep soil sites. Eleven deep soil profiles having minimum depth of 100m and maximum depth of 800 m with different sets of recorded earthquake time histories from Kiban Kyoshin network are used for the study. Nonlinear site response analyses were carried out using the program DEEPSOIL. Suitable shear modulus and damping curves are identified by a parametric study of varying shear modulus and damping curves for a matching computed response spectrum with the measured response spectrum. Soil properties and model curves are frozen for each profile, which are further used to identify the depth of half space. Findings: Perfect matching layer having shear wave velocity and depth has been analysed, the study indicated that location of half-space is independent of depth factor. However, it is noticed in the study that computed response spectrum is close to the measured response spectrum when input is given for layer having shear wave velocity of 760 m/s±100.This layer represents a depth of half space for site response analysis of the deep soil column. Application: We can utilize the finding to perform for better accuracy and consistent results based on current findings and same can be used for site response studies.Keywords
Earthquake, Effective Depth of Soil Column, Input Motion, Response Spectrum, Site Response.Full Text
- Establishing Empirical Correlation between Sediment Thickness and Resonant Frequency using HVSR for the Indo-Gangetic Plain
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Authors
Affiliations
1 Department of Civil Engineering, Indian Institute of Science, Bengaluru 560 012, IN
1 Department of Civil Engineering, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 117, No 9 (2019), Pagination: 1482-1491Abstract
In this study, microtremor survey was carried out at 31 locations of Indo-Gangetic Plains (IGP) using a pair of portable three-component short-period seismometers (Guralp CMG-6T-1) and Kelunji Echo Pro digital data acquisition system. The acquired raw data was processed to obtain the average H/V ratio of the ambient vibration spectrum. The frequency corresponding to the first peak of the average H/V spectrum was taken as resonant frequency of that particular site. A comparison was made between the resonant frequencies obtained from peak of the H/V spectrum with those obtained using the source–receiver function from previously published work. The results were in good agreement with each other. An empirical equation has been established for the IGP by relating resonance frequency with sediment thickness, using available data from nearby boreholes drilled up to bedrock. The empirical equation was compared with other equations available for deep soil sites, i.e. sites with soil thickness more than 750 m. Further, a combined equation was developed for the digitized data taken from previously published works of deep soil sites. Finally, it has been found that the regionspecific equation gives better estimate of sediment thickness than the other empirical equations; but in absence of such a region-specific equation, the proposed combined equation can be used for a quick preliminary assessment of sediment thickness of a deep soil region.Keywords
HVSR Method, Indo-Gangetic Plains, Microtremor, Resonant Frequency, Sediment Thickness.Full Text
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- An Inexpensive Foldscopic Approach for Quantitative Evaluation of the Shape of Sand Particles
Abstract Views :127 |
PDF Views:75
Authors
Kunjari Mog
1,
P. Anbazhagan
1
Affiliations
1 Department of Civil Engineering, Indian Institute of Science, Bengaluru 560 012, IN
1 Department of Civil Engineering, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 124, No 4 (2023), Pagination: 457-466Abstract
Shape is a fundamental key property of any object and an important physical attribute that remains ignored, although its importance has been accepted for quite some time and is not accounted for in standard soil classification guidelines. One of the reasons for this could be the lack of inexpensive microscopic instruments or image scanners in most laboratories. This study quantifies particle shape characteristics using a cost-effective foldscope approach. Four different types of sand were used in this study and results were compared against scanning electron microscopy (SEM) measurements. In addition, the effect of the number of particles and resolution on the analysis is discussed. It was found that the foldscope-based approach yielded consistent results with SEM in measuring the aspect ratio and roundness parameter (except circularity). The variation between the two approaches was found to be less than 5% for both aspect ratio and roundness; however, a significant difference was observed in the case of circularity (more than 50%) due to the influence of resolutionKeywords
Foldscope, Image Analysis, Particle Shape, Resolution, Sand.Full Text
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