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Liquefaction Assessment in Golem Area, Albania, by Means of In-situ Tests

Journal of Civil Engineering and Architecture 2015年第5期9卷 547-553页

作者： shpresa gashi neritan shkodrani Department of Civil Engineering Faculty of Civil Engineering Polytechnic of Tirana Tiran 1000 Albania

The liquefaction is a very significant phenomenon in clayey silty soils, silty sands and also sands. The high potential of liquefaction is generally recognized when these types of soils are laid under the hydrostatic water table. Low plasticity silts, silty sands and sands are found as recent alluvial deposits in the western coastal part of Albania, especially in the sandy beaches of Adriatic Sea near Durres City. The aim of this study is to evaluate the soil liquefaction potential in the area of Golem. Ten CPTUs （cone penetration test with pore pressure measurements） are carried out for the site investigation of soils. In this paper, results of the CPTU based liquefaction analysis are presented. The data of two CPTUs （10 in total） are analyzed and factor of safety was found by considering different levels of hazard and ground water. The results of liquefaction potential analysis show that the soils in the area of Golem have a high risk of liquefaction.

关键词： Cone penetration test liquefaction potential cyclic resistance ratio cyclic stress ratio safety factor.

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Seismic Soil Liquefaction for Deterministic and Probabilistic Approach Based on in <i>Situ</i>Test (CPTU) Data

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World Journal of Engineering and Technology 2015年第2期3卷 41-49页

作者： shpresa gashi neritan shkodrani Polytechnic University of Tirana

One of the most devastating effects of earthquakes in the seismic regions is liquefaction. Many research works have been done in this field and at present different methods are available for the liquefaction potential assessment. The liquefaction is a very significant phenomenon in clayey silty soils, silty sands and also sands. The high potential of liquefaction is generally recognized when these type of soils are laid under the hydrostatic water table. This paper make an overview of two different methods for the evaluation of liquefaction potential, and a case study is presented. Two methods presented here are the Deterministic Approach proposed by Robertson and Wride (1998), and the Probabilistic Approach proposed by Moss and co-workers. Case study of the liquefaction potential evaluation is done for the Golem area, where geotechnical data from CPTU test were collected. The results of analysis in the Golem area show that liquefaction has medium susceptibly to occur. From the analyses, it is shown that the Probabilistic Approach gives more accurate information about the risk of liquefaction than the Deterministic Approach.

关键词： Liquefaction Assessment Deterministic Approach Probabilistic Approach CPTU Test

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In Situ Tests--Predicted vs. Observed Settlements： A Comparative Case Study

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Journal of Civil Engineering and Architecture 2014年第7期8卷 824-832页

作者： neritan shkodrani Ergys Anamali Luisa Dhimitri shpresa gashi Department of Civil Engineering Faculty of Civil Engineering Polytechnic University of Tirana Tirane 1001 Albania Unit of Geotechnical Engineering T.T. Soil & Earthquake Consulting Tirane 1001 Albania

This paper aims to deal with the comparison of the estimated settlements derived by in situ tests with the observed settlements in site, in order to evaluate the accuracy of settlement prediction by in situ tests, in comparison not only with site observation by topographic means, but also with the values of settlements derived by numerical analysis by means of PLAXIS 2D and 3 D. The site where are carried out the tests and periodically are observed the settlements since the beginning of construction process, is located in the Oil Product Terminal, at the industrial park of Porto Romano, Durres, Albania. The main purpose of this project was the ground improvement by using preloading method in order to prevent liquefaction process and settlements. The data used to conduct this study are taken by the site investigation done after inserting into the soil vertical drains made of columns of free--draining gravel （gravel pile drains） until 14 m depth and center-to-center spacing of 2 m, and wick drains （premanufactured） until 25 m depth and center-to-center spacing of 1.8 m. The observed settlements are periodically measured by topographic equipments. This paper will present the conclusions derived by settlement analyzes from in situ tests and site observations.

关键词： Settlements cone penetration test dilatometer test constrained modulus.

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