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Showing 1 to 20 of 21 for “"Soil Liquefaction"”.
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The effects of multi-directional loading on soil liquefaction
… the influence of multi-directional shearing on soil behaviour, especially the undrained behaviour of saturated sands, remains one of the least understood areas in geotechnics. This study developed a new test database on Hostun sand with the modified multi-directional simple shear testing …
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A Predictive Modeling Approach for Assessing Seismic Soil Liquefaction Potential Using CPT Data
<p>Soil liquefaction, or loss of strength due to excess pore water pressures generated during dynamic loading, is a main cause of damage during earthquakes. When a soil liquefies (referred to as triggering), it may lose its ability to support overlying structures, deform vertically or laterally, or …
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Seismic behaviour of shallow foundations on layered liquefiable soils
… the most damaging<br/>natural hazards. Seismic soil liquefaction is often one of the major sources of<br/>damage and disruptions, and has been observed to severely affect key lifelines.<br/>Settlement and tilting of shallow foundations resting on saturated sandy/silty<br/>soils has been …
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Analysis of a Lateral Spreading Case History from the 2007 Pisco, Peru Earthquake
… of Magnitude (Mw) = 8.0 which triggered multiple liquefaction induced lateral spreads. The subduction earthquake lasted for approximately 100 seconds and showed a complex rupture. From the geotechnical perspective, the Pisco earthquake was significant for the amount of soil liquefaction observed. …
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Computational fluid dynamics modelling of pipeline on-bottom stability.
… regarding hydrodynamic loads on pipeline and soil resistance in isolation. In reality, the pipeline stability problem is much more complex involving hydrodynamic loadings, pipeline response, soil resistance, embedment and pipe-soil-fluid interaction. In this thesis Computational Fluid Dynamics …
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Moving Towards an Improved Liquefaction Hazard Framework: Lessons Resulting From the 2010-2011 Canterbury, New Zealand, Earthquake Sequence
… Zealand, Earthquake Sequence (CES) resulted in a liquefaction dataset of unprecedented size and quality, presenting a truly unique opportunity to assess and improve the efficacy of liquefaction-analytics in the field. Towards this end, the study presented herein develops and analyzes a database of …
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Liquefaction Potential of Unsaturated Nevada Sand Considering Different Intial Conditions
<p> It has been tacitly assumed that liquefaction does not occur in unsaturated soils during seismic events, because pore air behaves as a cushion and excess pore water pressure is difficult to accumulate. During recent earthquakes, some slopes composed of unsaturated soils experienced large …
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Use of Cone Penetration Testing in the Interpretation of Ground Shaking From Paleoliquefaction Evidence
… can be found in abundance in the form of soil liquefaction features. Present day measurements of liquefaction resistance can be used to estimate the severity of the ground shaking that had to occur to cause the observed liquefaction features. The database of present-day liquefaction cases …
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Modeling Liquefaction-Induced Road Disruptions in Cascadia Megathrust Earthquakes: Implications for Emergency Response and Access in the U.S. Pacific Northwest
… Zone (CSZ) are expected to trigger widespread soil liquefaction that could severely disrupt transportation systems across the U.S. Pacific Northwest. However, past regional assessments have relied on simple geologic screening methods and binomial shaking thresholds that are only loosely …
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Development of an Improved and Internally-Consistent Framework for Evaluating Liquefaction Damage Potential
Soil liquefaction continues to be one of the leading causes of ground failure during earthquakes, resulting in significant damage to infrastructure around the world. The study presented herein aims to develop improved methodologies for predicting liquefaction triggering and the consequent damage …
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Improving CPT-Based Earthquake Liquefaction Hazard Assessment at Challenging Soil Sites
Earthquake-induced soil liquefaction is a phenomenon in which saturated, sandy soil loses its strength and stiffness during earthquake shaking. Liquefaction can be extremely costly and damaging to infrastructure. The commonly used "simplified" stress-based liquefaction triggering framework is …
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Development of an Energy-based Liquefaction Evaluation Procedure
Soil liquefaction during earthquakes is a phenomenon that can cause tremendous damage to structures such as bridges, roads, buildings, and pipelines. The objective of this research is to develop an energy-based approach for evaluating the potential for liquefaction triggering. The current …
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EPOLLS: An Empirical Method for Prediciting Surface Displacements Due to Liquefaction-Induced Lateral Spreading in Earthquakes
… type of ground failure. When a subsurface soil deposit liquefies, intact blocks of surficial soil can move downslope, or toward a vertical free face, even when the ground surface is nearly level. A lateral spread is defined as the mostly horizontal movement of gently sloping ground (less …
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Evaluation and Development of Liquefaction Occurrence and Consequence Analytics Driven by Emerging Data and Technologies
… have been made to develop models that predict soil liquefaction. Many of the results may be described as either: (i) wholly empirical models that require only geologic or geospatial data, and which are accessible to a broad userbase; or (ii) semi-mechanistic “simplified stress-based” models …
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Seismic Response of Pile Foundations in Soft Clays and Layered Soils
… by transferring loads to deeper layers of soil. During earthquakes, in addition to the axial loads, pile foundations are subjected to inertial loads and kinematic loads due to the motion of the superstructure and the vibrations of surrounding soil, respectively. Due to the significant …
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Experimental and numerical investigations to assess the behaviour of a buried pipeline in areas with high geological instability
… such as landslides, fault movements, soil liquefaction which may be caused by seismic activity are one of the most dangerous phenomena that can involve buried pipelines, e.g. for oil and gas transportation, or water and sewage. This aspect is currently an important part of research and …
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Wave-induced liquefaction processes in marine sediments
An investigation for seabed liquefaction induced by progressive water waves is vital for the protection of marine structures from damage to the structure foundations. The residual liquefaction in sedimentary seabed has been found to be of progressive nature and experiments have also demonstrated …
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U.S. National Liquefaction Hazard Maps and their Implications for Engineering Practice and Policy
Abstract: This study introduces U.S. National Liquefaction Hazard Maps (NLHMs) developed using a mechanics-informed, machine-learning geospatial liquefaction model trained on more than 37,000 cone penetration tests from the U.S. and abroad. The model surrogates state-of-practice liquefaction …
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