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Application of soil designes values according to ULSD of EC 7-1 in Czech conditions
Koudelka, Petr
Some contemporary European codes (e.g., EC 1, EC 7-1) and standards (e.g., ČSN 73 0031) have taken into account in their theoretical bases a special granular character of soils and rocks with a different extent. The EUROCODES, i.e. EUROCODE 1 (EN 1991-1) "Basis of design and actions on structures - Part 1: Basis of design" and EUROCODE 7-1 (EN 1997-1) "Geotechnical design - Part 1: General rules" consider underground environment/mass in the same way as the other structures (e.g. steel, concrete, masonry, timber) without any theoretical exception for analyses of three-phase granular material structures. Thus, using theory of the Ultimate Limit State Design (ULSD), a statistical definition of characteristic values and several partial factors have been considered along with material partial factors for material design values of the soil mass properties.
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Experiment E5/0,1 with lateral passive pressure during rotation about the toe - granular mass deformations
Koudelka, Petr ; Bryscejn, Jan
A basic physical experimental research of lateral passive pressure is in progress at the Institute. The research is composed of three doubles of the same experiments with three basic retaining wall movements: rotations about the toe and top and translative motion. The experiment E5/0,1 with passive pressure and pressure at rest during wall rotation about the toe was carried out in 1st half 2012 and it was the first of the same experiment double (the 2nd one was the experiment E6/0,1 finished in the early 2013. Both experiments together should prove a real behaviour of non-cohesive mass acting on moving wall. The behaviour appears distinct from a theory of EUROCODE 7-1 contemporaneously used. Each of experiments has brought a huge data quantity. The paper shows mass deformations and slip surfaces of the experimental sandy mass.
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Process of lateral passive pressure acting in a sandy mass
Koudelka, Petr
The paper presents the results of physical experiment both with the passive pressure and the pressure at rest of the ideally non-cohesive sand on a retaining wall rotated about the top. The results are analysed and compared according to relevant requirements and recommendations of the final draft of EC 7-1(2004) and ČSN 73 0037. A preparation state of a next repeated physical experiment with passive pressure and pressure at rest to prove the results is mentioned.
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