Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Improvement of uplift capacity of strip anchor plate using granular trench
The improvement of the uplift capacity of horizontal anchor plate embedded in clay by constructing granular and cohesive-frictional trench over the anchor plate has been studied using finite-element lower-bound limit analysis. The improvement is obtained in the form of an efficiency factor (ξ), for various combinations of trench width (Bt), embedment ratio (H/B) and normalized cohesion (c u0 /γ clay B). The analysis was done for both homogeneous and non-homogeneous clay. The non-homogeneous clay has been modelled assuming linearly variation of cohesion with depth below ground surface. The study revealed that the improvement of uplift capacity achieved by constructing the granular trench is more significant in case of soft clay or for small values of c u0 /γ clay B. Further, the efficiency factor increases with an increase in the embedment ratio. Finally, for non-homogeneous soil, the magnitude of efficiency factor is found to be lesser than the magnitude of efficiency factor in homogeneous soil keeping other parameters unchanged.
Abbreviations: A: area of anchor plate; [A eq]: global matrix of equality constraint; [A ineq]: global matrix of inequality constraint; B: width of anchor plate; Bt: width of granular trench; [B eq]: global vector associated with equality constraints, [B ineq]: global vector associated with inequality constraints; cu0: undrained cohesion of clay at the ground surface; cu: undrained cohesion of clay at depth h from ground surface; c: cohesion of soil; Dc: number of discontinuities in the statically admissible stress field; E: total number of elements in finite element mesh; Fc: Pullout capacity factor in weightless soil; {g}: coefficient vector of objective function of optimum pullout load; h: depth below ground surface; H: embedment depth of the anchor plate measured from the ground surface; Ld: vertical extent of the domain considered below the anchor plate; Lr: horizontal distance between the right edge of the anchor plate and the right hand side vertical boundary (KL); N: total number of nodes of the mesh; Ni: total number of nodes present along the soil and anchor’s top or bottom interface; p: total sides of yield polygon; Pu: ultimate collapse load of horizontal anchor plate; rc: rate of increase of cohesion with depth; x: co-ordinate in x-direction; y: co-ordinate in y-direction; δ: internal friction angle between the interface of the anchor plate and surrounding soil; ξ: efficiency factor; γ clay: Bulk unit weight of clay; γ sand : unit weight of sand; ϕ: internal friction angle of granular material; {σ}: global vector of unknown nodal stress; σx: normal stress component in x-direction; σy: normal stress component in y-direction; τxy: shear stress component in x-y plane
Improvement of uplift capacity of strip anchor plate using granular trench
The improvement of the uplift capacity of horizontal anchor plate embedded in clay by constructing granular and cohesive-frictional trench over the anchor plate has been studied using finite-element lower-bound limit analysis. The improvement is obtained in the form of an efficiency factor (ξ), for various combinations of trench width (Bt), embedment ratio (H/B) and normalized cohesion (c u0 /γ clay B). The analysis was done for both homogeneous and non-homogeneous clay. The non-homogeneous clay has been modelled assuming linearly variation of cohesion with depth below ground surface. The study revealed that the improvement of uplift capacity achieved by constructing the granular trench is more significant in case of soft clay or for small values of c u0 /γ clay B. Further, the efficiency factor increases with an increase in the embedment ratio. Finally, for non-homogeneous soil, the magnitude of efficiency factor is found to be lesser than the magnitude of efficiency factor in homogeneous soil keeping other parameters unchanged.
Abbreviations: A: area of anchor plate; [A eq]: global matrix of equality constraint; [A ineq]: global matrix of inequality constraint; B: width of anchor plate; Bt: width of granular trench; [B eq]: global vector associated with equality constraints, [B ineq]: global vector associated with inequality constraints; cu0: undrained cohesion of clay at the ground surface; cu: undrained cohesion of clay at depth h from ground surface; c: cohesion of soil; Dc: number of discontinuities in the statically admissible stress field; E: total number of elements in finite element mesh; Fc: Pullout capacity factor in weightless soil; {g}: coefficient vector of objective function of optimum pullout load; h: depth below ground surface; H: embedment depth of the anchor plate measured from the ground surface; Ld: vertical extent of the domain considered below the anchor plate; Lr: horizontal distance between the right edge of the anchor plate and the right hand side vertical boundary (KL); N: total number of nodes of the mesh; Ni: total number of nodes present along the soil and anchor’s top or bottom interface; p: total sides of yield polygon; Pu: ultimate collapse load of horizontal anchor plate; rc: rate of increase of cohesion with depth; x: co-ordinate in x-direction; y: co-ordinate in y-direction; δ: internal friction angle between the interface of the anchor plate and surrounding soil; ξ: efficiency factor; γ clay: Bulk unit weight of clay; γ sand : unit weight of sand; ϕ: internal friction angle of granular material; {σ}: global vector of unknown nodal stress; σx: normal stress component in x-direction; σy: normal stress component in y-direction; τxy: shear stress component in x-y plane
Improvement of uplift capacity of strip anchor plate using granular trench
Bhattacharya, Paramita (Autor:in) / Sadhukhan, Soumya (Autor:in)
International Journal of Geotechnical Engineering ; 14 ; 843-850
02.10.2020
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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