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Lateral earth pressure
About: Lateral earth pressure is a research topic. Over the lifetime, 5334 publications have been published within this topic receiving 62552 citations.
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TL;DR: In this article, a method for the active earth pressure on the possibly inclined face of a retaining wall provided with a drainage system along the soil-structure interface is presented, where water seepage through the soil is first analyzed using a numerical procedure based on the boundary element method.
Abstract: A calculation method for the active earth pressure on the possibly inclined face of a retaining wall provided with a drainage system along the soil–structure interface is presented. The soil is cohesionless and fully saturated to the ground surface. This situation may arise during heavy rainstorms. To solve the problem, the water seepage through the soil is first analyzed using a numerical procedure based on the boundary element method. Then, the obtained pore-water pressure is used in a Coulomb-type formulation, which supposes a plane failure surface inside the backfill when the wall movement is enough to put the soil mass in the active state. The formulation provides coefficients of active pressure with seepage effect which can be used to evaluate the active earth thrust on walls of any height. A series of charts with values of the coefficients of active earth pressure with seepage calculated for selected values of the soil internal friction angle, the wall–soil friction angle, and the wall face inclina...
20 citations
TL;DR: In this paper, the authors focus on assessing the passive soil pressure that can be mobilised by passive and active retaining structures used for slope stabilisation purposes; passive structures are taken to be those left free to move and find their own equilibrium against the soil pressure, and active structures those equipped with pre-stressed ground anchors that lead to an upward movement against the unstable sloping soil.
Abstract: Soil-retaining structures, such as anchored, gravity and diaphragm walls can be used effectively to stabilise unstable, shallow slopes. The present work focuses on assessing the passive soil pressure that can be mobilised by passive and active retaining structures used for slope stabilisation purposes; passive structures are taken to be those left free to move and find their own equilibrium against the soil pressure, and active structures those equipped with pre-stressed ground anchors that lead to an upward movement against the unstable sloping soil. The numerical analyses performed with the Abaqus finite-element code and the comparison drawn with available theoretical solutions show that, in the case of passive retaining structures, the maximum horizontal soil pressure that can be exerted by the unstable soil layer on the retaining structure is independent of soil–wall friction and coincides with Rankine's passive value. However, in the case of active retaining structures, the passive soil pressure may ...
20 citations
14 May 2010
TL;DR: In this article, a unified solution for unsaturated soil in terms of two independent state stress variables is presented based on both Unified Strength Theory (UST) and Fredlund's shear strength theory for uns saturated soil, which can be especially versatile in reflecting the effect of intermediate principal stress.
Abstract: The unified solution for shear strength for unsaturated soil in terms of two independent state stress variables is presented based on both Unified Strength Theory (UST) and Fredlund’s shear strength theory for unsaturated soil, which can be especially versatile in reflecting the effect of intermediate principal stress. Considering different distributions of matric suction, the unified solution of active earth pressure for unsaturated soil is deduced, which could avoid some shortages of Rankine’s active earth pressure. The influence of the intermediate principal stress and matric suction on the active earth pressure is also investigated. It is shown that the active earth pressure decreases significantly with an increase in the unified strength theory parameter or matric suction.
20 citations
TL;DR: In this paper, a kinematical framework for the estimation of active earth pressure on retaining structures in cohesive backfills is proposed, based on which a valid rotational collapse mechanism is established.
20 citations
Journal Article•
TL;DR: In this article, the concept of the plasticity theory is employed in a hyperbolic model and the strength and yield functions derived based on Lo's equation are used to differentiate Young's moduli between primary loading and unloading/reloading states.
Abstract: The original hyperbolic model uses the stress level criterion to differentiate the state between the primary loading and unloading/reloading states. This simple stress level criterion cannot take into account the rotation of principal stresses or the anisotropic soil behavior. In this study, the concept of the plasticity theory is employed in a hyperbolic model. The strength and yield functions derived based on Lo's equation are used to differentiate Young's moduli between primary loading and unloading/reloading states. The strength criterion can estimate the undrained shear strengths in various directions with good accuracy, based on the laboratory test results in the literature. An excavation case with complete field observations is then studied using the finite element method with the modified and original hyperbolic models. Analysis results show that the proposed method can give better prediction for wall deflection, ground surface settlement, wall bending moment, total lateral earth pressure and bottom heave, compared with the original model. (A)
20 citations