RESEARCH OF INFLUENCE OF GROOVING PLANE RIGIDITY ON STRENGTH- DEFORMED CONDITION OF BERTHS THIN WALLS

Abstract

Almost 45% of berths in Ukraine, according to the construction scheme refer to 
thin walls. The main bearing element is the front and anchor walls, made of steel grooving plane. In 
the practice of designing berths thin walls, thus far, methods based on classical pressure theory are 
widely used. The walls themselves are considered as vertical beams, which are under the influence 
of  active  and  passive  soil  pressure,  determined  by  the  Coulomb  formulas  (E. Jacobi,  Bloom-
Lomeyer  methods,  etc.).  However,  efforts  in  structural  elements  prove  to  be  overstated  and 
constructive decisions are uneconomical. In the work the analysis of influence of grooving plane 
hardness  change  on  the  work  of  the  whole  structure  is  presented.  We  consider  the  Larsen  5 
grooving plane, manufactured by different manufacturers and came out in three modifications L 5, 
L  5D,  L  5-UM.  The  finite  element  method  implemented  in  PLAXIS  is  used.  In  the  calculation 
scheme of the thin-wall construction, the main structural elements are represented: front and anchor 
walls,  anchor  strands,  foundation  soil  and  backfill.  When  creating  a  calculation  scheme,  it  is 
necessary  to  enter  data  on  the  structure  and  soil  conditions,  and  the  lack  of  initial  data  or  their 
incompleteness may cause uncertainty, which can lead to errors in the calculations. 
The purpose of the study is to determine the magnitude of the influence of changes in the 
hardness characteristics of the grooving plane L 5, L 5D, L 5-UM on the stress-strain state of thin 
walls. 
To achieve the goal of the study the following tasks were solved: 
1. Build a berth calculation scheme in PLAXIS; 
2. Perform calculations for three levels of grooving plane rigidness; 
3. Perform a comparative analysis of the data obtained with the results of a field experiment, 
which was performed by Rengach V. N. [5] 
According  to  the  results  obtained,  it  can  be  concluded  that  changes  in  the  rigidness  of 
grooving plane have the greatest effect on the deformation and magnitude of bending moment. So 
with  increased  rigidity  from  107*10 3   to  160*10 3   kNm/m  moment  in  the  wall  and  maximum 
displacement are changed by 10%.