The influence of local geological and geotechnical characteristics on the scale of ground shaking... more The influence of local geological and geotechnical characteristics on the scale of ground shaking during the earthquake has been well known for a long time. Typical characteristics of strong ground motion like amplitude, frequency and duration will subject to modify due to the influence of local soil conditions. The continuous modifications in the soil deposits lead to amplify or de-amplify the site. The amplification is one of the major key parameters which is significantly used to account the site effects and considered to design the earthquake-resistant structures. The shear wave velocity ( V s ) is one of the most important dynamic properties of the soil and is used to represent the stiffness of the soil deposits. The V s is significantly used to characterize the ground motion either by simplified site classification method or by prices site-specific ground response analysis (GRA). In this study, an attempt was made to estimate the site response of the Amaravati region, Andhra Pradesh, India. The selected capital region is comes under seismic zone III as per the Bureau of Indian standard code BIS: 1893-2016, with a maximum peak horizontal acceleration value of 0.16 g. To assess the penetration resistance (N) number in the selected region, a total of 65 boreholes have been conducted using standard penetration test (SPT) and the V s of all the profiles determined using the appropriate existing correlation between V s and SPT-N. Based on the estimated V s , the seismic site classification is done according to the national earthquake hazard reduction program and Eurocode 08. To conduct the GRA, a total of nine representative sites have been selected and response analysis is conducted for all selected sites using DEEPSOIL software through the one-dimensional equivalent linear approach. The results from the response analysis of all selected boreholes locations have been presented in terms of acceleration time histories at the surface, variation of peak ground acceleration, site amplification along with the depth of the soil column, response spectra for 5% damping and Fourier amplitude ratio against frequency.
Learning and Analytics in Intelligent Systems, 2019
The performance of any reinforced soil structures is primarily governed by soil and geosynthetic ... more The performance of any reinforced soil structures is primarily governed by soil and geosynthetic interface friction mechanism. Nowadays, due to non- availability of suitable backfill materials, exploration has been started to find out alternative one. On other hand, pond ash which is a waste by-product generating from thermal power plants has many desirable engineering properties, encouraging to use as backfill material. In this connection, the present work is focused to find the interfacial frictional characteristics of pond ash reinforced with two biaxial geogrid materials by conducting the large scale direct shear test and pullout tests. From the test results, it is observed that the interface friction properties of two tests in terms of coefficient of interface friction (\( \text{C}_{\text{i}} \)) and pullout frictional factor (\( \text{f}^{*} \)) are in the range of 0.86 to 0.74 and 0.54 to 0.35 respectively.
International journal of engineering research and technology, 2018
Granular column ground-improvement methods are widely used to improve bearing capacity and provid... more Granular column ground-improvement methods are widely used to improve bearing capacity and provide a drainage path. However, the behaviour of granular columns depends on the confinement provided by the surrounding soil, which limits their use in poor soils. A new groundimprovement method is proposed using pervious concrete piles to provide high permeability while also providing higher stiffness and strength, which are independent of surrounding soil confinement. This paper investigates the behaviour of Pervious concrete piles under Vertical and Lateral loading and the effects of installation on their response.
Ground improvement is the process by which soil behaviour is altered mainly by physical means. Ty... more Ground improvement is the process by which soil behaviour is altered mainly by physical means. Typical examples range from inclusion of structural elements such as piles or soil nails, to use of any compaction technique in which the bearing capacity of soil is enhanced. The use of stone columns in conjunction with soft or weak soils represents a very cost-effective way of improving bearing capacity. In addition, stone columns being highly permeable provide natural drainage, thereby accelerating consolidation. However, the physical behaviour of stone columns is affected by nature of the soil in which they are embedded. In particular, they offer little resistance to lateral loading generated by soil movement. This paper advocates the use of an innovative ground improvement technique, which involves partial cementation of granular columns resulting in Pervious Concrete Piles . This study includes formulation of mix design (1:1:4) for pervious concrete and detailed analysis of pile behaviour under axial and lateral loading. It was found that under same axial loading conditions, the load-carrying capacity of pervious concrete model pile exceeded four times that of a granular column with same dimensions. A series of lateral loading tests were conducted on 5-cm-diameter pervious concrete model piles with length/diameter ratios of 6, 10 and 14. The bending moment profile shows that pervious concrete pile behaves in the same way as flexible piles subjected to lateral loading. This type of behaviour has potential to transfer the load below failure surface without compromising on permeability criteria, thereby improving stability.
A site-specific probabilistic seismic hazard analysis (PSHA) has been carried out for the heritag... more A site-specific probabilistic seismic hazard analysis (PSHA) has been carried out for the heritage city Warangal in Telangana state of Peninsular India. The Cornell–McGuire approach of PSHA has been considered to estimate the hazard. The area of influence is taken as 500 km radius. A homogeneous and updated earthquake catalogue was compiled for the considered area which was later categorized into four seismic sources (zones) considering the earthquake epicentre and geology. The seismic parameters a and b were estimated and the b value of the for the four seismic zones ranges from 0.72 to 0.97, whereas the a value ranges from 2.45 to 3.20. The results obtained are shown as uniform hazard curves and hazard maps showing the spatial variation peak ground acceleration (PGA) considering 2% and 10% probability of exceedance in 50 years. The PGA and PSA values were compared with NDMA (Development of probabilistic seismic hazard map of India, technical report of the Working Committee of Experts (WCE), National Disaster Management Authority (NDMA), Govt. of India, New Delhi, 2010) and IS 1893-1 (Criteria for earthquake resistant design of structures, part 1: general provisions and buildings, 6th edition, Bureau of Indian Standards, New Delhi, 2016). The study focussed on understanding the possibility of seismic hazard at the heritage city Warangal in Peninsular India.
The current interest in research related to the coordination chemistry of porphyrinlike macrocycl... more The current interest in research related to the coordination chemistry of porphyrinlike macrocycles is aimed at the design of ligands that would stabilize higher coordination geometries. In this regard, a new class of" expanded porphyrins", viz." texaphyrins" and" ...
The influence of local geological and geotechnical characteristics on the scale of ground shaking... more The influence of local geological and geotechnical characteristics on the scale of ground shaking during the earthquake has been well known for a long time. Typical characteristics of strong ground motion like amplitude, frequency and duration will subject to modify due to the influence of local soil conditions. The continuous modifications in the soil deposits lead to amplify or de-amplify the site. The amplification is one of the major key parameters which is significantly used to account the site effects and considered to design the earthquake-resistant structures. The shear wave velocity ( V s ) is one of the most important dynamic properties of the soil and is used to represent the stiffness of the soil deposits. The V s is significantly used to characterize the ground motion either by simplified site classification method or by prices site-specific ground response analysis (GRA). In this study, an attempt was made to estimate the site response of the Amaravati region, Andhra Pradesh, India. The selected capital region is comes under seismic zone III as per the Bureau of Indian standard code BIS: 1893-2016, with a maximum peak horizontal acceleration value of 0.16 g. To assess the penetration resistance (N) number in the selected region, a total of 65 boreholes have been conducted using standard penetration test (SPT) and the V s of all the profiles determined using the appropriate existing correlation between V s and SPT-N. Based on the estimated V s , the seismic site classification is done according to the national earthquake hazard reduction program and Eurocode 08. To conduct the GRA, a total of nine representative sites have been selected and response analysis is conducted for all selected sites using DEEPSOIL software through the one-dimensional equivalent linear approach. The results from the response analysis of all selected boreholes locations have been presented in terms of acceleration time histories at the surface, variation of peak ground acceleration, site amplification along with the depth of the soil column, response spectra for 5% damping and Fourier amplitude ratio against frequency.
Learning and Analytics in Intelligent Systems, 2019
The performance of any reinforced soil structures is primarily governed by soil and geosynthetic ... more The performance of any reinforced soil structures is primarily governed by soil and geosynthetic interface friction mechanism. Nowadays, due to non- availability of suitable backfill materials, exploration has been started to find out alternative one. On other hand, pond ash which is a waste by-product generating from thermal power plants has many desirable engineering properties, encouraging to use as backfill material. In this connection, the present work is focused to find the interfacial frictional characteristics of pond ash reinforced with two biaxial geogrid materials by conducting the large scale direct shear test and pullout tests. From the test results, it is observed that the interface friction properties of two tests in terms of coefficient of interface friction (\( \text{C}_{\text{i}} \)) and pullout frictional factor (\( \text{f}^{*} \)) are in the range of 0.86 to 0.74 and 0.54 to 0.35 respectively.
International journal of engineering research and technology, 2018
Granular column ground-improvement methods are widely used to improve bearing capacity and provid... more Granular column ground-improvement methods are widely used to improve bearing capacity and provide a drainage path. However, the behaviour of granular columns depends on the confinement provided by the surrounding soil, which limits their use in poor soils. A new groundimprovement method is proposed using pervious concrete piles to provide high permeability while also providing higher stiffness and strength, which are independent of surrounding soil confinement. This paper investigates the behaviour of Pervious concrete piles under Vertical and Lateral loading and the effects of installation on their response.
Ground improvement is the process by which soil behaviour is altered mainly by physical means. Ty... more Ground improvement is the process by which soil behaviour is altered mainly by physical means. Typical examples range from inclusion of structural elements such as piles or soil nails, to use of any compaction technique in which the bearing capacity of soil is enhanced. The use of stone columns in conjunction with soft or weak soils represents a very cost-effective way of improving bearing capacity. In addition, stone columns being highly permeable provide natural drainage, thereby accelerating consolidation. However, the physical behaviour of stone columns is affected by nature of the soil in which they are embedded. In particular, they offer little resistance to lateral loading generated by soil movement. This paper advocates the use of an innovative ground improvement technique, which involves partial cementation of granular columns resulting in Pervious Concrete Piles . This study includes formulation of mix design (1:1:4) for pervious concrete and detailed analysis of pile behaviour under axial and lateral loading. It was found that under same axial loading conditions, the load-carrying capacity of pervious concrete model pile exceeded four times that of a granular column with same dimensions. A series of lateral loading tests were conducted on 5-cm-diameter pervious concrete model piles with length/diameter ratios of 6, 10 and 14. The bending moment profile shows that pervious concrete pile behaves in the same way as flexible piles subjected to lateral loading. This type of behaviour has potential to transfer the load below failure surface without compromising on permeability criteria, thereby improving stability.
A site-specific probabilistic seismic hazard analysis (PSHA) has been carried out for the heritag... more A site-specific probabilistic seismic hazard analysis (PSHA) has been carried out for the heritage city Warangal in Telangana state of Peninsular India. The Cornell–McGuire approach of PSHA has been considered to estimate the hazard. The area of influence is taken as 500 km radius. A homogeneous and updated earthquake catalogue was compiled for the considered area which was later categorized into four seismic sources (zones) considering the earthquake epicentre and geology. The seismic parameters a and b were estimated and the b value of the for the four seismic zones ranges from 0.72 to 0.97, whereas the a value ranges from 2.45 to 3.20. The results obtained are shown as uniform hazard curves and hazard maps showing the spatial variation peak ground acceleration (PGA) considering 2% and 10% probability of exceedance in 50 years. The PGA and PSA values were compared with NDMA (Development of probabilistic seismic hazard map of India, technical report of the Working Committee of Experts (WCE), National Disaster Management Authority (NDMA), Govt. of India, New Delhi, 2010) and IS 1893-1 (Criteria for earthquake resistant design of structures, part 1: general provisions and buildings, 6th edition, Bureau of Indian Standards, New Delhi, 2016). The study focussed on understanding the possibility of seismic hazard at the heritage city Warangal in Peninsular India.
The current interest in research related to the coordination chemistry of porphyrinlike macrocycl... more The current interest in research related to the coordination chemistry of porphyrinlike macrocycles is aimed at the design of ligands that would stabilize higher coordination geometries. In this regard, a new class of" expanded porphyrins", viz." texaphyrins" and" ...
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