Liquefaction Susceptibility Assessment Using Geotechnical and Geological Manners of Northern Thailand

2020 ◽  
Vol 11 (2) ◽  
pp. 50-71
Author(s):  
Yayat Kusumahadi ◽  
Suttisak Soralump ◽  
Montri Jinagoolwipat
Keyword(s):  
Spectral Analysis ◽  
Groundwater Table ◽  
Soil Resistance ◽  
Susceptibility Assessment ◽  
Liquefaction Potential ◽  
Liquefaction Susceptibility ◽  
Site Investigations ◽  
Geological Formation ◽  
Soil Site ◽  
High Seismicity

Soil site investigations such as boring logs, basic soil properties, spectral analysis of surface wave, and the examinations of geologic and geomorphologic were performed in Mae Lao area to investigate the susceptibility of liquefaction after the 6.2 Mw Chiang Rai Earthquake 2014. The study area was found to lay on a complex geological formation and geotechnical behavior with a condition of the high groundwater table. Being located on a high seismicity area (intensity V-VII Mercalli) governs the study area as a concern for high liquefaction hazards. Liquefaction susceptibility-based compositional criteria, soil resistance, and geologic criteria have been established, and consequently, the character of liquefaction potential is defined.

Detailed hydrogeological studies are often necessary to assess the water balance of a watershed. Understanding the hydrogeological structures makes it possible to establish the watershed boundaries, to verify the congruence of the watershed hydrographic boundaries and the boundaries of the groundwater basin (Chapter 2), to locate the aquifers at various depths, and to establish the relationship between these aquifers and the surface water. In reminder, the groundwater system is connected to the hydrological cycle by various processes: infiltration through the unsaturated zone, contribution to ground-water by percolation and leakage, evaporation from the unsaturated zone, and finally, groundwater outflow. Definitions: Aquifers and Types of Groundwater Hydrogeology is based on the analysis of two essential entities: the aquifer and the groundwater table: An is a permeable geological formation (soil or rock) with pores or cracks that interconnect and that are sufficiently large that water can freely circulate under the effect of gravity (examples: sands, gravels, fissured chalk, sandstone, etc). In this way, the aquifer constitutes a reservoir for the groundwater tables. The is all the water contained in the saturated zone of the

Hydrology ◽  
2010 ◽  
pp. 227-228
Keyword(s):  
Surface Water ◽  
Unsaturated Zone ◽  
Hydrological Cycle ◽  
Groundwater Table ◽  
Groundwater System ◽  
Geological Formation ◽  
Groundwater Basin ◽  
Hydrogeological Studies ◽  
The Relationship ◽  
Groundwater Outflow

scholarly journals SHEARD CLAYEY SHALES OF FLYSCH. THEIR BEHAVIOR DURING THE EXCAVATION OF THE DIVERSION TUNNEL OF GADOURA DAM IN RHODES (GREECE)

2004 ◽  
Vol 36 (4) ◽  
pp. 1773
Author(s):  
Π. Μαρίνος ◽  
T. Χριστοδουλοπούλου ◽  
Β. Περλέρος
Keyword(s):  
Engineering Geology ◽  
Groundwater Table ◽  
Fiber Glass ◽  
Pressure Relief ◽  
Tunnel Face ◽  
Diversion Tunnel ◽  
Geotechnical Parameters ◽  
Temporary Support ◽  
The Face ◽  
Geological Formation

This paper deals with the particular geological-geotechnical conditions that predominate in the construction area of the diversion tunnel of Gadoura dam (in Rhodes) and the way these conditions were taken under consideration during the construction of the temporary support system. The intensely sheared geological formation of flysch that is encountered in the construction area of the tunnel, is characterised by the predomination of clayey shales against siltstones and other lithological members (sandstone horizons, occasional gypsum lenses and limited limestone intercalations) and by the absence of a groundwater table. The main features of this argillaceous facies of flysch are: the schistosity-foliation due to tectonic compression and the chaotic structure, in places where it occurs in alternations with sandstone and siltstone, due to differential deformation of the strata. As a result, squeezing phenomena occured during the tunnel advance. According to the engineering geology model, which was proposed after the first excavation works, sheared clayey shales compose a "soil type" rockmass specified by very low geotechnical parameters (GSI=15-20, ITIJ=6, Oci=5-10 MPa, E m =30r>500 MPa, c'=150+250 kPa, φ=13°+18° και oCm=0,400,60 MPa). Performing a declined surface on the tunnel face, shotcrete and fiber glass anchoring, this weak rockmass was behaved well on the face. The applying of a light forpoling system has contributed to the stabilization of the face and of the cylindrical "core" of rock immediately ahead of the advancing face, although it was a conservative measure. Steel ribs incorporated into shotcrete were used for the support of the tunnel behind the face. Lateral forces were further stabilized by the closure of the invert using reinforced concrete. Weep holes were locally opened for the pore pressure relief.

The use of critical state soil mechanics to characterise Christchurch soil in relation to liquefaction susceptibility

2016 ◽  
Vol 49 (4) ◽  
pp. 319-333
Author(s):  
Jeremy Tan ◽  
Rolando P. Orense ◽  
Andy O’Sullivan
Keyword(s):  
Critical State ◽  
Soil Mechanics ◽  
State Parameter ◽  
Cyclic Stress ◽  
Empirical Methods ◽  
Liquefaction Potential ◽  
Liquefaction Susceptibility ◽  
Cyclic Resistance ◽  
Stress Ratios ◽  
Parameter Values

The majority of current procedures used to deduce liquefaction potential of soils rely on empirical methods. These methods have been proven to work in the past, but these methods are known to overestimate the liquefaction potential in certain regions of Christchurch due to a whole range of factors, and the theoretical basis behind these methods cannot be explained scientifically. Critical state soil mechanics theory was chosen to provide an explanation for the soil’s behaviour during the undrained shearing. Soils from two sites in Christchurch were characterised at regular intervals for the critical layers and tested for the critical state lines (CSL). Various models and relationships were then used to predict the CSL and compared with the actual CSL. However none of the methods used managed to predict the CSL accurately, and a separate Christchurch exclusive relationship was proposed. The resultant state parameter values could be obtained from shear-wave velocity plots and were then developed into cyclic resistance ratios (CRR). These were subsequently compared with cyclic stress ratios (CSR) from recent Christchurch earthquakes to obtain the factor of safety. This CSL-based approach was compared with other empirical methods and was shown to yield a favourable relationship with visual observations at the sites’ locations following the earthquake.

Assessment of Liquefaction Potential Index Using Deterministic and Probabilistic Approaches

2012 ◽  
Vol 3 (2) ◽  
pp. 60-76 ◽  
Author(s):  
Naveen James ◽  
T. G. Sitharam ◽  
K. S. Vipin
Keyword(s):  
Nuclear Power ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Liquefaction Potential ◽  
Liquefaction Susceptibility ◽  
Liquefaction Potential Index ◽  
Potential Index ◽  
Liquefaction Hazard ◽  
Sudden Decrease ◽  
Deterministic And Probabilistic Approaches

Liquefaction is a devastating effect of earthquakes resulting in sudden decrease in shear strength due to excess pore water pressure generation, resulting in differential settlement of structure, inducing severe damages. Assessment of liquefaction hazard for a given site is important for planning out mitigation works. In this paper the liquefaction susceptibility using deterministic and probabilistic methodologies was assessed and results are presented in terms of liquefaction potential index (LPI) for a nuclear power plant site. The results of this study are explored further in the article.

Characterization of silty soil thin layering and groundwater conditions for liquefaction assessment

2020 ◽  
Vol 57 (2) ◽  
pp. 263-276 ◽  
Author(s):  
Christine Z. Beyzaei ◽  
Jonathan D. Bray ◽  
Misko Cubrinovski ◽  
Sarah Bastin ◽  
Mark Stringer ◽  
...  
Keyword(s):  
Site Investigation ◽  
Groundwater Table ◽  
High Quality ◽  
Silty Soil ◽  
Cone Penetration Tests ◽  
Site Investigations ◽  
Groundwater Fluctuations ◽  
Groundwater Table Fluctuation ◽  
Assessment Procedures ◽  
Liquefaction Assessment

Tools for characterizing thin layering and groundwater table conditions are evaluated at silty soil sites being assessed for liquefaction. Thin interlayered stratigraphy and groundwater table fluctuation are two potential causes for inconsistencies observed during the Canterbury earthquake sequence, wherein liquefaction did not manifest at several silty soil sites, despite simplified liquefaction assessment procedures indicating severe manifestations would be expected. Site investigations should capture these features to allow for improved assessment of liquefaction potential at silty soil sites. Cone penetration tests (CPTs), mini-CPTs, and sonic borings do not adequately capture thin layering. However, detailed logging of high-quality samples captures the actual in situ layering that may help explain the limitations of simplified liquefaction assessment procedures at these sites, revealing the need to understand underlying limitations in current site investigation techniques. Piezometers, sonic borings, high-quality sampling, crosshole testing, and regional groundwater maps are evaluated to assess their ability to capture complex groundwater conditions. Multiple groundwater measurement methods are typically required to characterize groundwater fluctuations. An approach to using enhanced site characterization tools is recommended for liquefaction assessments at silty soil sites with thin layering and groundwater fluctuations.

Surface and downhole shear wave seismic methods for thick soil site investigations

2002 ◽  
Vol 22 (9-12) ◽  
pp. 931-941 ◽  
Author(s):  
J.A Hunter ◽  
B Benjumea ◽  
J.B Harris ◽  
R.D Miller ◽  
S.E Pullan ◽  
...  
Keyword(s):  
Shear Wave ◽  
Site Investigations ◽  
Seismic Methods ◽  
Soil Site

Liquefaction Potential for Kolkata City

2013 ◽  
Vol 4 (2) ◽  
pp. 18-33 ◽  
Author(s):  
Ravi Sankar Jakka ◽  
Amit Shiuly ◽  
Ranjit Das
Keyword(s):  
Factor Of Safety ◽  
Alluvial Soil ◽  
Seismic Demand ◽  
Soil Resistance ◽  
Liquefaction Potential ◽  
Soil Layers ◽  
Ground Shaking ◽  
Large Thickness ◽  
Soil Deposits ◽  
Kolkata City

This paper presents the liquefaction potential of densely populated Kolkata city, which is situated on the world's largest delta island with very soft and thick alluvial soil deposits. Due to presence of soft alluvium deposits at shallow depths, soil resistance against liquefaction is expected to be less. Additionally, large thickness of soil layers may amplify the ground shaking resulting in high seismic demand on the soil. Here in this study, variation of factor of safety against liquefaction is evaluated with depth at different locations in Kolkota city. The study founds striking results that the Kolkata city soils are less prone to liquefaction even though there is significant ground amplification due to presence of thick soil deposits.

Sign in / Sign up

Export Citation Format

Share Document