Can soil arching be insensitive to phi?

Singh, S., Sivakugan, N., and Shukla, S.K. (2010) Can soil arching be insensitive to phi? International Journal of Geomechanics, 10 (3). pp. 124-128.

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Arching is a common phenomenon that is encountered in backfilling behind retaining walls, trenches, or underground voids in the mine. Marston's equation has been widely used and modified for computing stresses within backfills, duly accounting for the reduction in stresses due to arching. A critical appraisal of Marston's equation and its improved forms reveal that the average vertical stress within the soil backfill at any depth is governed by the product of earth pressure coefficient K and wall-backfill frictional coefficient µ, which does not vary significantly with variation in friction angle phi of the granular soil backfill. The average normal stress depends on the value assumed for delta/phi and whether the lateral earth pressure coefficient has been assumed as Ka, K0, or KKrynine. Therefore, it is not necessary to direct any effort toward determining the friction angle of the backfill precisely. Rather, attention should be paid to the value of delta/phi and the appropriate expression for K. Thus, it can be stated that soil arching is almost insensitive to the friction angle phi of the backfill.

Item ID: 11350
Item Type: Article (Research - C1)
ISSN: 1943-5622
Keywords: arching; earth pressure coefficients; soil friction angle; wall-backfill interface friction angle
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Date Deposited: 16 Aug 2010 04:17
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering @ 100%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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