Department of Civil & Environmental Engineering

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Browsing Department of Civil & Environmental Engineering by Author "Adedokun S."

Now showing 1 - 3 of 3
  • Item
    Open Access
    Comparison of Earth Pressure between Numerical and Analytical Methods for Jointed Rock Wedges
    (Springer, 2015) Son M.; Adedokun S.
    The magnitude of earth pressure of jointed rock wedges against a support system was investigated both analytically and numerically. Analytical method was based on the wedge analysis and numerical method was based on the discrete element method. To consider various rock wedge conditions, the controlled parameters included the rock type, number of joint, and joint shear condition. The results of analytical method were compared with the numerical test results. The comparison showed that the earth pressure of jointed rock wedges can be assessed larger by the analytical method than the numerical method and as the number of joints increases, the results of both methods becomes closer. In addition, the results indicated that the earth pressure of jointed rock wedges was strongly dependent on the rock type, number of joint, and joint shear condition. This study suggested that both the ground-structure interaction and rock and joint conditions are important for assessing the earth pressure of jointed rock wedges, and these factors should be considered when designing a support system economically and reasonably against jointed rock wedges.
  • Item
    Open Access
    Earth Pressure Envelope for Retaining Wall in Jointed Rock Ground
    (Springer, 2019) Son M.; Adedokun S.
    Earth pressure against a retaining wall in a jointed rock ground are an important factor for design and construction. A physical model test, extensive numerical studies, and field observations were conducted and comprehensively analyzed. All of the results were integrated and analyzed to develop an earth pressure envelope for the design of retaining walls in a jointed rock ground. For this purpose, the rock mass conditions and induced earth pressures were systematically investigated for different analysis cases. The rock mass conditions were classified using the slope mass rating (SMR) method and divided into six rock mass classes. The induced earth pressures of cases in the same rock mass class were plotted together, and an earth pressure envelope that covers the induced earth pressures in each rock mass class was developed. The developed envelope was compared with field observations, which show that the field results are generally consistent with the developed envelope in the same rock mass class. The study results and developed earth pressure envelope could help to provide a better understanding and design of retaining walls in a jointed rock ground.
  • Item
    Open Access
    Earth Pressure on an Excavation Wall in Rock Mass
    (Springer, 2020) Adedokun S.; Son M
    In this study, the earth pressure on an excavation wall in rock mass is investigated under various conditions (type of rock, angle of join inclination, shear strength of joint, groundwater, permeability of wall, and earth pressure coefficient at rest). Based on the results of a physical model test of an excavation wall in joined rock mass, extended parametric study is performed considering the rock-structure interaction based on the discrete element method. The study results suggest that the earth pressure is strongly influenced by the condition of groundwater as well as the condition of wall and rock mass. The effect of groundwater on the earth pressure in a jointed rock mass different depending on rock type, the earth pressure coefficient at rest, wall permeability, and joint inclination angle. The groundwater effect was greatest under an impermeable wall condition and a vertical joint acted as an impermeable wall. Under inclined joint and groundwater conditions, the earth pressure in a permeable wall increased when compared with no groundwater condition and the increase was more evident when the earth pressure coefficient was smaller. As the rock and joint conditions were deteriorated further, the earth pressure increased and the influence of groundwater decreased. The study results also showed that for hard rock and good joint conditions, the influence of groundwater was more significant as the earth pressure coefficient increased, but as rock and joint weathered, the influence of groundwater was more significant as the earth pressure coefficient decreased.