Analyse des pressions de terre passive et active sur les structures de soutènement par approche numérique

LANABI, Houssem Eddine (2024) Analyse des pressions de terre passive et active sur les structures de soutènement par approche numérique. Doctoral thesis, Faculté des Sciences et de la technologie.

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Abstract

The current design methodologies for retaining walls predominantly hinge on assumptions related to translational movement. However, in practical scenarios, retaining structures often experience rotational movements, particularly in cases involving integral bridge abutments, strutted walls, embedded walls, and sheet piles. This critical distinction has prompted a surge of interest and research in understanding lateral earth pressure behavior behind rotating retaining walls in recent years. This thesis conducts comprehensive numerical investigations into the influence of various types of wall movements: translation, rotation about the top and rotation about the bottom, on both two-dimensional and three-dimensional lateral earth pressure. The investigation is performed using the explicit difference software FLAC and FLAC3D for accurate and detailed analysis. The examination of multi-dimensional behaviors allows for a comprehensive assessment of the active and passive earth pressures under various conditions of wall movements. The results of the present numerical analysis demonstrate that in the case of translational movement of the retaining wall, the obtained active and passive earth pressure distributions exhibit a linear pattern; similar to the one provided by commonly used theories from literature. However, when rotational movement is introduced, the distribution tends to obtain a non-linear pattern, with active earth pressure coefficients higher than those from translation mode and lower passive ones. In the case of rotation about top, the generated passive earth pressure is almost null at the upper part of the wall, while an important increment of passive load can be noticed with depth. Hence, the resulting earth pressure centroid is situated below the one-third of the wall height. The active earth pressure in that case is also distributed with a non-linear shape having a centroid situated at a higher position than that used in literature. Conversely, in rotation about bottom, the rotational motion of the wall induces a full mobilization of passive earth pressure in the upper half of the wall. This is followed by a partial mobilization that rapidly decreases, ultimately converging towards the earth pressure at rest near the base of the wall. This movement pattern results in an earth pressure distribution centroid surpassing one-third of the wall's height. However, the active earth pressure shows a centroid situated at a lower position. These variations in active and passive earth pressure distributions and magnitudes under different modes of wall movements underscore the intricate nature of soil-structure interactions. Understanding these responses holds practical implications for the design and stability of retaining structures. ملخص تتمحور المنهجيات ال

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