UTILIZATION OF HIGH MODULUS COLUMNS IN FOUNDATION ENGINEERING UNDER SEISMIC ...

UTILIZATION OF HIGH MODULUS COLUMNS IN FOUNDATION ENGINEERING UNDER SEISMIC ...

10 Pages · 2005 · 83 KB · English

UNDER SEISMIC LOADINGS. H. Turan. Durgunoglu. 1. ABSTRACT. In this paper, definition of various foundation systems are provided. Among these systems, utilization of jet grouting as high controlled modulus columns for various foundation engineering purposes are evaluated together with 

UTILIZATION OF HIGH MODULUS COLUMNS IN FOUNDATION ENGINEERING UNDER SEISMIC ... free download

UTILIZATION OF HIGH MODULUS COLUMNS IN FOUNDATION ENGINEERING UNDER SEISMIC LOADINGS H Turan Durgunoglu 1 ABSTRACT In this paper, definition of various foundation systems are provided Among these systems, utilization of jet grouting as high controlled modulus columns for various foundation engineering purposes are evaluated together with construction parameters, quality control and verification of design criteria The method of calculation of factor of safety against liquefaction under seismic loading is given together with the utilization of jet grout columns as high modulus columns against liquefaction Proposed design methodology is evaluated and verified, based on three case studies where jet grouting was implemented before August 17, 1999 Kocaeli/Turkey Earthquake observing the performance of subsoil and foundations during the earthquake Introduction In the selection of various foundation systems loading conditions together with hazard identification are considered In seismically active areas such as Turkey often the design of the foundation is controlled by the parameters of the selected design earthquakes Liquefaction of subsoil, under earthquakes is one of the primary hazard that has to be considered during the design and construction The factor of safety against liquefaction could easily be determined based on the detailed soil modeling at a given site for a design earthquake There are various mitigation procedures against liquefaction based on the following principles • Utilization of prefabricated special high permeability drains or stone columns to facilitate the immediate drainage of excess pore water pressure developed during shaking • Utilization of subsoil compaction by means of vibroflotation, vibroreplacment, compaction piles, and dynamic compaction to increase CRR • Utilization of high modulus columns by means of deep mixing and/or jet grouting within the subsoil to decrease CSR taken by the subsoil This paper will describe only the last procedure The construction and design parameters of such columns will be defined A simplified design algorithm for the utilization of these 1 Professor of Geotechnical Engineering Emeritus, Bogazici University, and Chairman of Zetas Earth Technolgy Corp, Istanbul, Turkey columns against liquefaction and their effects towards the factor of safety will be provided The result of three case studies related to positive performance of such improved foundations during 17 August 1999 Kocaeli/Turkey Earthquake is also provided Definition of High Modulus Columns Structural memberscolumns having different stiffnesses are designed and constructed for various purposes within the soil as part of the foundation systems in different civil engineering structures These columns having higher modulus than the original foundation subsoil could be classified in three groups as follows: Rigid Foundation Systems RFS The reinforced concrete piles constructed using various techniques could be included in this group Driven piles, driven castinsitu piles, castinsitu piles and micropiles are some examples of rigid foundation systems In this system the rigidity of the structural member, ie pile is much larger than the surrounding soil, and therefore the vertical loads from the upperstructure is carried only by these members by means of skin friction and/or tip resistance For the lateral loads, pile caps supported by the foundation subsoil or structural slabongrade slab and special steel reinforcement close to the top of the pile are often utilized For such rigid structural reinforced concrete column the deformation modulus could be taken as E cl= 25,000 MPa and the modulus ratio (modulus of column/modulus of subsoil) could vary E cl/E s ~ 1000 6000 depending on the nature and stiffness of the subsoil

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