Analysis of active earth pressure against rigid caissons backfilled with crushed rock and sand

Authors: Paik, Kyuho; Sagong, Myung; Lee, Hyungjoo

Source: Canadian Geotechnical Journal, Volume 46, Number 10, October 2009 , pp. 1216-1228(13)

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Abstract:

Arching effects in backfill materials generate a nonlinear active earth-pressure distribution behind a rough, rigid retaining wall. There are several analyses for estimating the nonlinear active earth pressures on a retaining wall exerted by a homogeneous backfill in the presence of arching. However, it is not possible to use these analyses for a caisson backfilled with crushed rock and sand, which is common in marine structures. In this study, a new formulation is proposed for calculating the nonlinear active earth pressure acting on a caisson backfilled with crushed rock and sand. The new formulation allows important insights, including the dependence of the slope angle of the crushed rock - sand interface that minimizes the active force and overturning moment on the caisson on the shear strengths of the crushed rock and sand and the geometry of the problem.

Les effets d'arche dans les matériaux remblayés génèrent une distribution non linéaire des pressions actives des terres derrière un mur de soutènement rigide. Il existe plusieurs types d'analyses pour estimer les pressions actives non linéaires exercées sur un mur de soutènement par un remblai homogène, en présence d'effet d'arche. Cependant, ce n'est pas possible d'utiliser ces analyses pour un caisson remblayé avec de la roche broyée et du sable, ce qui est commun dans les structures marines. Dans cette étude, une nouvelle formulation pour calculer la pression active des terres non linéaire qui agit sur un caisson remblayé avec de la roche broyée et du sable est proposée. La nouvelle formulation souligne d'importants aspects, parmi ceux-ci mentionnons la dépendance de l'angle de la pente de l'interface roches broyées - sable qui minimise la force active et le moment de renversement sur le caisson sur la résistance au cisaillement de la roche broyée et du sable, ainsi que la géométrie du problème.

Document Type: Research article

Publication date: 2009-10-01

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Published since 1963, this monthly journal features articles, notes, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers, theoreticians, and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Papers on actual case records from practice are encouraged and frequently featured.
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Analysis of active earth pressure against rigid caissons backfilled with crushed rock and sand

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