Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/6220
Title: .. MI _. ` AT REST - EARTH PRESSURE . FOR COHESSIONLESS FILLS
Authors: Pandey, Umesh Kumar
Keywords: EARTHQUAKE ENGINEERING;COHESSIONLESS FILLS;WELL FOUNDATIONS;NUMERICAL METHOD
Issue Date: 1995
Abstract: Earth pressures are required for design of marry civil engineering structures which may be subjected to very, small movements due. - to performance criteria. Well foundations; basements of the'bu ldings, power house eto are examples. For such cases- adtive / passive . earth, pressure under- stcitic/dynaraic conditions are not s.plicable. . Therefore it is desirably: to formulate a methpd` of analysis to compute - dist-ribution of d1splr cement dependent static/dynamic at, rest earth pressures Based upon. experimental Investigation Lambe and Whl tman(1969 )' have 'recommended 'a relationship between mobilised. Furth pressure'coeffIcient as a function of wall movements. A 9. d~tic fu.nCtion has -been proposed to represent this .. f re1~+tlonship used in this method of analysis . The soil . may be considered to be in the -state of failure.- at any arbitrarily chosr~ri strain level.- for taall'.'.deformation . -The mobilized value of 0 along the rupture surfs.ee --fo' r a' given value of mobilized earth pressure coefficient . and the corresponding value of wall u ovement' - may' be.' obtained by uzing the theor3' of couloiab's for static case and the theory of Mononabe"-Okabe, for dynamic case . 'This enables the - computation- of at- rest. earth pressures by using these theories Joshi and Frajapati (1.982) proposed a' numerical method. for computation of distribution_ of active earth pressures . This - w,As further rnodif ied b3. Das (1988) and •Frasad (1989). The Coulomb's theory and the Morconohe Okahe theory- do not providh: distribution of " earth pressures. Therefore the above cited -numerical method for obtaining pressure distributions are extended for computation of at rest pressure in the proposed method of. analysis, (114,) A software entitled A REST,:has-been developed based on rthe,.-proposed investigations using FORTRAN-77 language to. carry,,._ out parametric studies .-' The '°results . of the investigations are carried out in termst.of. dimensionless parameters which is highly' desirable,. the results indicate that'. at rest- earth pressures decrease with increase - :-in - • -w,a'1i - movements -which is expected. similarly the at rest: pressure decrease with. increasing values of uit mate-angle of shearing:resistance. The. horizontal seismic coefficient- appears to,:be..-tho .most: significant.-- factor resulting into :higher .values of at re'a t :pressure with increasing value of this seismic coefficient This is also on . the expected lines .' The vertical seismic ..coefficient. (cnr) . generates i inertia: force in the - upward direction -resulti:n-into larger: values of at rest pressures, compared to _those generated, by the ,seisrnic coefficient ' leading to inertia forces directed :downward . The angle of ' wall back, has relatively smaller influence on at rest. earth pressures-. The. ,IS code of practice _and .,IRC code of practice do not make,explicit recommendation... for., computation of at rest pressures. However-, IRC • code, i.:s: ,flexible, enough.. to allow the use of any rational theory or computation of at rest earth pressures which is _not 'with the case- in IS _code of practice. The 1.3 code needs to be urgently -revised in this,. "regard.
URI: http://hdl.handle.net/123456789/6220
Other Identifiers: M.Tech
Research Supervisor/ Guide: Joshi, V. H.
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' THESES (Earthquake Engg)

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