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- 저자 : Cinicioglu (검색결과 2 건)
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Method for the Rapid Evaluation of Vehicle Mobility on Unpaved Terrain
Ozer Cinicioglu,Caglar Cagbayir 대한토목학회 2012 KSCE JOURNAL OF CIVIL ENGINEERING Vol.16 No.5
In cases where the mobilization of vehicle convoys in off-road conditions are considered, the mechanism of soil-vehicle interaction emerges as the key parameter controlling the travel time along the chosen route. Therefore, this paper proposes a new simplistic method that would allow the rapid evaluation of vehicle mobility in off-road conditions based on soil topography and vehicle characteristics. This method considers the limit equilibrium of soil under the loading conditions imposed by an accelerating vehicle and by natural terrain geometry. The influence of surface topography on soil’s stress state is considered by modifying the dynamic fluidization theory. In this paper it is proven that the underlying assumptions of the fluidization theory are very well suited to define the nature of stress rotations in sloping ground and the resulting geometry of bearing capacity failure surfaces. Additionally, in order to consider the inertial effects and the effects of shear transfer between the vehicle and the soil, a Coulomb-type mechanism is adopted.
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Determination of active failure surface geometry for cohesionless backfills
Altunbas, Adlen,Soltanbeigi, Behzad,Cinicioglu, Ozer Techno-Press 2017 Geomechanics & engineering Vol.12 No.6
The extent by which economy and safety concerns can be addressed in earth retaining structure design depends on the accuracy of the assumed failure surface. Accordingly, this study attempts to investigate and quantify mechanical backfill properties that control failure surface geometry of cohesionless backfills at the active state for translational mode of wall movements. For this purpose, a small scale 1 g physical model study was conducted. The experimental setup simulated the conditions of a backfill behind a laterally translating vertical retaining wall in plane strain conditions. To monitor the influence of dilative behavior on failure surface geometry, model tests were conducted on backfills with different densities corresponding to different dilation angles. Failure surface geometries were identified using particle image velocimetry (PIV) method. Friction and dilation angles of the backfill are calculated as functions of failure stress state and relative density of the backfill using a well-known empirical equation, making it possible to quantify the influence of dilation angle on failure surface geometry. As a result, an empirical equation is proposed to predict active failure surface geometry for cohesionless backfills based on peak dilatancy angle. It is shown that the failure surface geometries calculated using the proposed equation are in good agreement with the identified failure surfaces.
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