Determination of Active Earth Pressure on Rigid Retaining Wall Considering Arching Effect in Cohesive Backfill Soil

Rao, Pingping; Chen, Qingsheng; Zhou, Ye; Nimbalkar, Sanjay; Chiaro, Gabriele

doi:10.1061/(asce)gm.1943-5622.0000589

Cited by 67 publications

(40 citation statements)

References 22 publications

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“…The stress state in the loosening zone of a trapdoor problem is considerably related to the trajectory of principal stress. In the study of earth pressure acting on a retaining wall, many scholars have used different assumptions, such as arc shape trajectory, [28][29][30][31][32][33][34] catenary shape trajectory, 35,36 and parabolic shape trajectory, 37,38 to evaluate the influence of the soil arching effect. But the difference and applicability of these three kinds of principal stress' trajectories have not been investigated in detail.…”

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confidence: 99%

Numerical and theoretical research on stress distribution in the loosening zone of the trapdoor problem

Liang

2019

Num Anal Meth Geomechanics

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Summary The traditional theory of soil arching effect was developed on the assumption that stress distribution in the loosening zone is uniform. However, because of the deflection of principal stress' direction, the stress distribution in the loosening zone is actually ununiform. For the evaluation of principal stress axis deflection and stress redistribution, a discrete element method numerical model of trapdoor problem is established for the simulation of soil arching effect. Based on the numerical results, an arc shape of major principal stress trajectory and uniform horizontal stress distribution at the same depth of the loosening zone are adopted. An analytical model is raised to estimate the average loosening earth pressure acting on the trapdoor and stress distribution in the loosening zone at a limit state. In addition, comparison studies are carried out between the predictions of the proposed solutions and discrete element method numerical results as well as available model test results, thereby validating the accuracy of the proposed theoretical model. Both numerical and theoretical results indicate that the vertical stress distribution in the loosening zone is obviously ununiform. The load acting in the middle of loosening zone is transferred toward two sides so that the vertical stress distribution in loosening zone is concave.

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confidence: 99%

Numerical and theoretical research on stress distribution in the loosening zone of the trapdoor problem

Liang

2019

Num Anal Meth Geomechanics

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“…For a vertical rock face, the deflection angle of principal stress at the backfill-rock interface is [25]…”

Section: Estimation Of Stress Statementioning

confidence: 99%

A Strength Design Method of Cemented Backfill with a High Aspect Ratio

Wang

2020

Advances in Civil Engineering

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To calculate the required strength of a cemented backfill with high aspect ratio, the confirmation of lateral pressure is fundamental and needs to be determined first. As for the backfill with a high aspect ratio of height to length, the shape of the slip surface is not straight when in the active state due to the limited space, which is different from the general backfill. For this reason, a formulation of the slip surface with a curved shape and a lateral pressure calculation method based on this curved slip surface were proposed. The proposed equation of the slip surface is affected by the geometry parameters of the backfill, internal friction angle of the backfill, and the friction angle of the backfill-rock interface. Then, by the combination of the minor principal stress trajectory method and the horizontal slice method, an ordinary differential equation of stresses was established and then solved numerically. Finally, the method based on Mitchell’s three-dimensional limit equilibrium model was used to calculate the required strength of the cemented backfill. The calculated results were compared with previous studies and validated with numerical models. The results showed good consistency for the backfills with high aspect ratios.

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“…The analysis of lateral active earth pressure in cohesive soils is carried out using the horizontal flat element method. In this method (Rao et al [36]), the failure wedge is divided into a number of horizontal flat elements.…”

Section: Effect Of Soil Arching On the Stability Of Retaining Structuresmentioning

confidence: 99%

Stability Assessment of Earth Retaining Structures under Static and Seismic Conditions

et al. 2019

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An accurate estimation of static and seismic earth pressures is extremely important in geotechnical design. The conventional Coulomb’s approach and Mononobe-Okabe’s approach have been widely used in engineering practice. However, the latter approach provides the linear distribution of seismic earth pressure behind a retaining wall in an approximate way. Therefore, the pseudo-dynamic method can be used to compute the distribution of seismic active earth pressure in a more realistic manner. The effect of wall and soil inertia must be considered for the design of a retaining wall under seismic conditions. The method proposed considers the propagation of shear and primary waves through the backfill soil and the retaining wall due to seismic excitation. The crude estimate of finding the approximate seismic acceleration makes the pseudo-static approach often unreliable to adopt in the stability assessment of retaining walls. The predictions of the active earth pressure using Coulomb theory are not consistent with the laboratory results to the development of arching in the backfill soil. A new method is proposed to compute the active earth pressure acting on the backface of a rigid retaining wall undergoing horizontal translation. The predictions of the proposed method are verified against results of laboratory tests as well as the results from other methods proposed in the past.

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Determination of Active Earth Pressure on Rigid Retaining Wall Considering Arching Effect in Cohesive Backfill Soil

Cited by 67 publications

References 22 publications

Numerical and theoretical research on stress distribution in the loosening zone of the trapdoor problem

Numerical and theoretical research on stress distribution in the loosening zone of the trapdoor problem

A Strength Design Method of Cemented Backfill with a High Aspect Ratio

Stability Assessment of Earth Retaining Structures under Static and Seismic Conditions

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