The Effects of Vertical Stress on the Liquefaction Potential Originated from Buildings in The Urban Areas

2017 ◽  
Vol 8 (1) ◽  
pp. 38-57
Author(s):  
Mehmet Ozcelik
Keyword(s):  
Urban Areas ◽  
Standard Penetration Test ◽  
Soil Liquefaction ◽  
Vertical Stress ◽  
Limited Information ◽  
Penetration Test ◽  
Liquefaction Potential ◽  
Empirical Procedure ◽  
Seismic Forces

Main purpose of this paper is to study the influence of vertical stress on soil liquefaction in urban areas. The literature provides limited information on vertical stress analysis of multiple footings, and, as a result, there is no accurate way to account for the effect of the foundation depth on liquefaction. Additionally, practical methods do not exist for considering the interaction between the neighboring foundations vertical stress and seismic forces in the urban area. Vertical stress distribution was calculated in examining the soil liquefaction potential exhibited by building foundations as a case study. The vertical stresses were chosen randomly for some buildings with foundation depths of 3.00 m; 4.50 and 6.00 m at the Burkent site (Burdur-Turkey). The influence of 5-storey buildings on the liquefaction potential of sandy soils was evaluated in terms of the safety factor (FS) against liquefaction along soil profile depths for different earthquakes. Standard Penetration Test (SPT) results were used based on simplified empirical procedure.

The Effects of Vertical Stress on the Liquefaction Potential Originated from Buildings in The Urban Areas

2020 ◽  
pp. 351-372
Author(s):  
Mehmet Ozcelik
Keyword(s):  
Urban Areas ◽  
Sandy Soils ◽  
Standard Penetration Test ◽  
Soil Liquefaction ◽  
Vertical Stress ◽  
Limited Information ◽  
Liquefaction Potential ◽  
Empirical Procedure ◽  
Seismic Forces

Main purpose of this paper is to study the influence of vertical stress on soil liquefaction in urban areas. The literature provides limited information on vertical stress analysis of multiple footings, and, as a result, there is no accurate way to account for the effect of the foundation depth on liquefaction. Additionally, practical methods do not exist for considering the interaction between the neighboring foundations vertical stress and seismic forces in the urban area. Vertical stress distribution was calculated in examining the soil liquefaction potential exhibited by building foundations as a case study. The vertical stresses were chosen randomly for some buildings with foundation depths of 3.00 m; 4.50 and 6.00 m at the Burkent site (Burdur-Turkey). The influence of 5-storey buildings on the liquefaction potential of sandy soils was evaluated in terms of the safety factor (FS) against liquefaction along soil profile depths for different earthquakes. Standard Penetration Test (SPT) results were used based on simplified empirical procedure.

scholarly journals Standard Penetration Test-Based Probabilistic and Deterministic Assessment of Seismic Soil Liquefaction Potential

2004 ◽  
Vol 130 (12) ◽  
pp. 1314-1340 ◽  
Author(s):  
K. Onder Cetin ◽  
Raymond B. Seed ◽  
Armen Der Kiureghian ◽  
Kohji Tokimatsu ◽  
Leslie F. Harder ◽  
...  
Keyword(s):  
Standard Penetration Test ◽  
Soil Liquefaction ◽  
Penetration Test ◽  
Liquefaction Potential

scholarly journals Evaluation Of Bucharest Soil Liquefaction Potential

2015 ◽  
Vol 11 (1) ◽  
pp. 40-48 ◽  
Author(s):  
Arion Cristian ◽  
Calarasu Elena ◽  
Neagu Cristian
Keyword(s):  
Surface Wave ◽  
Standard Penetration Test ◽  
Soil Liquefaction ◽  
Penetration Test ◽  
Borehole Data ◽  
Liquefaction Resistance ◽  
Liquefaction Potential ◽  
Data Standard ◽  
Wave Methods ◽  
Surface Wave Method

Abstract The paper contains the experimental research performed in Bucharest like the borehole data (Standard Penetration Test) and the data obtained from seismic investigations (down-hole prospecting and surface-wave methods). The evaluation of the soils liquefaction resistance based on the results of the SPT, down-hole prospecting and surface-wave method tests and the use of the earthquake records will be presented.

scholarly journals Assessment of liquefaction potential index for Mumbai city

2012 ◽  
Vol 12 (9) ◽  
pp. 2759-2768 ◽  
Author(s):  
J. Dixit ◽  
D. M. Dewaikar ◽  
R. S. Jangid
Keyword(s):  
Standard Penetration Test ◽  
Soil Liquefaction ◽  
Reclaimed Land ◽  
Liquefaction Potential ◽  
Contour Maps ◽  
Empirical Procedure ◽  
Liquefaction Potential Index ◽  
Potential Index ◽  
The City ◽  
Mumbai City

Abstract. Mumbai city is the financial capital of India and is fifth most densely populated city in the world. Seismic soil liquefaction is evaluated for Mumbai city in terms of the factors of safety against liquefaction (FS) along the depths of soil profiles for different earthquakes with 2% probability of exceedance in 50 yr using standard penetration test (SPT)-based simplified empirical procedure. This liquefaction potential is evaluated at 142 representative sites in the city using the borehole records from standard penetration tests. Liquefaction potential index (LPI) is evaluated at each borehole location from the obtained factors of safety (FS) to predict the potential of liquefaction to cause damage at the surface level at the site of interest. Spatial distribution of soil liquefaction potential is presented in the form of contour maps of LPI values. As the majority of the sites in the city are of reclaimed land, the vulnerability of liquefaction is observed to be very high at many places.

scholarly journals Effect of Micropiles on Clean Sand Liquefaction Risk Based on CPT and SPT

2020 ◽  
Vol 10 (9) ◽  
pp. 3111 ◽  
Author(s):  
Visar Farhangi ◽  
Moses Karakouzian ◽  
Marten Geertsema
Keyword(s):  
Soil Properties ◽  
Factor Of Safety ◽  
Standard Penetration Test ◽  
Strength Properties ◽  
Soil Liquefaction ◽  
Penetration Test ◽  
Sand Liquefaction ◽  
Abrupt Decrease ◽  
Novel Approach ◽  
Jet Grouting

Liquefaction is a hazardous seismic-based phenomenon, which causes an abrupt decrease in soil strength properties and can result in the massive destruction of the built environment. This research presents a novel approach to reduce the risk of soil liquefaction using jet-grouted micropiles in clean sands. The saturated soil profile of the study project mainly contains clean sands, which are suitable to more reliably employ simplified soil liquefaction analyses. The grouting is conducted using 420 micropiles to increase the existing soil properties. The effect of jet grouting on reducing the potential of liquefaction is assessed using the results of the cone penetration test (CPT) and the standard penetration test (SPT), which were conducted before and after jet grouting by implementing micropiles in the project sites. According to three CPT-based liquefaction analyses, the Juang method predicts the most effective improvement range of the factor of safety in the clean sand. The Boulanger and Idriss, and Eurocode methods show comparable evaluations. Results of the SPT-based analyses show the most considerable increase of the factor of safety following the Boulanger and Idriss, and NCEER approaches in the SP soil. CPT- and SPT-based analyses confirm the effectiveness of jet grouting by micropiles on enhancing soil properties and reducing the risk of liquefaction.

scholarly journals Assessment of soil liquefaction potential: a case study for Moulvibazar town, Sylhet, Bangladesh

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Md. Shakhawat Hossain ◽  
A. S. M. Maksud Kamal ◽  
Md. Zillur Rahman ◽  
Atikul Haque Farazi ◽  
Dhiman Ranjan Mondal ◽  
...  
Keyword(s):  
Soil Liquefaction ◽  
Liquefaction Potential

Evaluating cyclic liquefaction potential using the cone penetration test

1998 ◽  
Vol 35 (3) ◽  
pp. 442-459 ◽  
Author(s):  
P K Robertson ◽  
CE (Fear) Wride
Keyword(s):  
Earthquake Engineering ◽  
Sandy Soils ◽  
Cone Penetration Test ◽  
Soil Liquefaction ◽  
Penetration Test ◽  
Cone Penetration ◽  
Liquefaction Resistance ◽  
Liquefaction Potential ◽  
Engineering Research ◽  
Research Workshop

Soil liquefaction is a major concern for structures constructed with or on sandy soils. This paper describes the phenomena of soil liquefaction, reviews suitable definitions, and provides an update on methods to evaluate cyclic liquefaction using the cone penetration test (CPT). A method is described to estimate grain characteristics directly from the CPT and to incorporate this into one of the methods for evaluating resistance to cyclic loading. A worked example is also provided, illustrating how the continuous nature of the CPT can provide a good evaluation of cyclic liquefaction potential, on an overall profile basis. This paper forms part of the final submission by the authors to the proceedings of the 1996 National Center for Earthquake Engineering Research workshop on evaluation of liquefaction resistance of soils.Key words: cyclic liquefaction, sandy soils, cone penetration test

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