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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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Podobnost plošných základů podle ČSN 73 1001
Koudelka, Petr
Now, that the translation into Czech and the National Annex of EC7-1 (EUROCODE 7 - Geotechnical design, Part 1: General rules) are carried out it seems convenient to make a broad comparative analysis of the EC7-1 and ČSN 73 1001 design procedures. The calculating procedure according to ČSN 73 1001 requires 8 inputs, the similar procedure according to EC7-1 requires 10 inputs. These numbers of inputs yield a huge number of combinations for a comparative analysis. The paper deals with a similarity solution of bearing capacity of shallow foundations according to ČSN 73 1001. The solution should form the base of the comparative analysis base for simpler numerical analysing.
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Experiment E3/2 - Vliv teploty na boční tlak sypkého tělesa
Valach, Jaroslav ; Koudelka, Petr
The first part of long-term experiment E3 with passive pressure has been started in the second half of 2001 and carried out during 2002. The partial experiment has been marked E3/2 according to the second type of the wall movement (rotation about the top). The paper presents the analysis of temperature changes of the stand structure at the results of the experiment E3/2.
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Tření na rubu konstrukce při aktivním tlaku - Experiment E2
Koudelka, Petr ; Koudelka, T.
The paper presents a part of verification of an existence of supposed phenomena by physical modelling of lateral (earth) pressure. .Initial supposed theoretical base of the General Lateral Pressure Theory in 1996 was built according to numerical knowledge of the time. There was developed an experimental stand with 5 bi-component pressure sensors and made the experiment E2 with active pressure.
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Pokročilejší teoretická koncepce zemního tlaku pro EC7-1 a ČSN 73 0037 - Předběžný návrh
Koudelka, Petr
The last knowledge of a long-term research has led to fundamental objections to the theoretical concept of our basic standards on earth pressure (EC7-1 and ČSN 73 0037) and to the formulation of more advanced General Lateral Pressure Theory (GLPT). The paper analyzes the concepts of the actual standards and their discrepancies with real soil behaviour. Also, it is shown and explained a new more advanced concept according to GLPT.
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