Circular precast concrete manholes: numerical modeling

Sabouni, Reem; NaggarM.H., El

doi:10.1139/l11-059

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…8 that the calculated and measured results are comparable. The full verification of the numerical model against the experimental results for other aspects such as the pressure underneath the cylindrical shaft base, the strains in the cylindrical shaft segments and the strains in the cylindrical shaft base are described in detail in Sabouni and El Naggar (2011b).…”

Section: Model Verification Using Experimental Resultsmentioning

confidence: 99%

Lateral Earth Pressure on Cylindrical Concrete Shafts

Sabouni

Naggar

2016

Geotech Geol Eng

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Cylindrical concrete shafts are one of the main components of any concrete storm water or sewerage system. The state of stresses within the soil surrounding these shafts are not fully understood, since it is different than the well known stresses behind retaining walls due to the radial stiffness of the shaft. This paper concentrates on studying the lateral pressure around such shafts. The presented study consists of two main parts: an experimental program that comprises full-scale testing of cylindrical shafts under in situ conditions in a controlled laboratory environment, and a numerical modeling investigation using the finite element method. The research results showed that the lateral earth pressure ranged between above the at-rest to slightly below the active earth pressure based on the soil type. The shafts in clayey soils experienced larger lateral pressure values than those in sandy soils. The effect of compaction was found to be significant at the top two meters of backfill and negligible below that. The live load was found to have a marginal effect on the pressure close to the top of cylindrical shaft and this effect decreases with depth (i.e. distance from top of cylindrical shaft). Comparisons were made between the lateral earth pressure observed in this study and some proposed procedures by the Canadian Highway Bridge design code for calculating pressure behind retaining walls.

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Section: Model Verification Using Experimental Resultsmentioning

confidence: 99%

Lateral Earth Pressure on Cylindrical Concrete Shafts

Sabouni

Naggar

2016

Geotech Geol Eng

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“…Their results indicated that both manholes were able to withstand the applied loads, the maximum overall calculated strain approximately 75% in the 1200 mm manhole and 83% in 1500 mm manhole less than the base cracking strain. Sabouni and El Naggar (2011b) also generated a numerical model (FE) for both The same procedure and materials as used by Najafi and Sever (2015a) were used in this research.…”

Section: 4mentioning

confidence: 99%

“…All their manholes withstood the truck loads, even the non-reinforced one. Sabouni and El Naggar (2011b) used these results to validate a 3-dimensional Finite Element model (FE) for circular, precast and concrete manholes. The FE model was used to test a different combination of concrete manholes in native soil conditions, including soil compaction, groundwater level, trench dimensions and method of installation.…”

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confidence: 99%