Classification of. Retaining walls. • Gravity wall-Masonry or Plain concrete. • Cantilever retaining wall-RCC. (Inverted T and L). • Counterfort retaining wall- RCC. Types of reinforced concrete retaining walls are cantilever retaining walls and counterfort retaining walls. Functions and parts of these retaining walls. In this type of retaining wall, counterforts (cantilevers) are provided on the earth side between wall and footing to support the wall, which essentially spans as a.
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This type of wall proves to be economical for moderate heights say 6 to 7m. Each of these components are designed as a cantilever.
How could counterforts in counterfort retaining wall assist in resisting earth pressure?
Before proceeding with the structural design it is necessary to ensure that the preliminary dimensions assumed for the various components of the wall will render it safe against above referred types of failures.
This type of wall with a key is shown in Fig. Risk assessment in geotechnical engineering. To avoid failure of the retaining wall it is necessary that the following requirements are satisfied.
How well do we know what we are doing? In this type of wall the base slab as well as the stem of the wall span horizontally as continuous slabs between vertical brackets known as counterforts as shown in Fig. The horizontal component retaihing all lateral pressures tends to slide the wall along its base. Reliability analysis of cantilever retaining walls. Wall retaining submerged backfill. If the factor of safety against sliding works out to be less than 1.
Counterfort retaining wall
Wall retaining dry and levelled backfill. It is a common practice to neglect the passive resistance of the soil in front of the toe of the wall in this check. Wall retaining back-fill in slope: Design retainiing Isolated Column Footing. Towards reliability-based design for geotechnical engineering Kok Kwang Phoon Skip to search form Skip to main content.
Structural Reliability Analysis and Design. The foundations of the retaining wall should be placed at such a depth where soil of required bearing capacity is available. The base width b of the retaining wall vary between 0.
Counterfort retaining wall | architecture |
The lateral pressure due to the backfill and surcharge if any tends to overturn the retaining wall about its toe. Wall retaining submerged backfill: Wall retaining backfill in slope. Depending upon the height H of the wall the top width of stem can vary between mm to mm.
Prior to start of structural design of a retaining wall it is necessary to adopt some tentative dimensions for different components of the wall. The passive pressure developed by the key resists sliding and raises the factor of safety to required limit. Hence total lateral earth pressure at the base of wall is given by. This is shown in pressure diagram in Fig.
The wall is so proportioned that the dead weight of the wall provides required stability against the thrust exerted by the backfill including surcharge if any.
The lateral pressure exerted by the submerged soil is considered to comprise of the following two components. Wall with backfill levelled and subjected to uniform surcharge. When the height of the retaining wall to be provided exceeds 6 counterfkrt 7m, counterfort retaining wall prove to be economical.
Let the intensity of surcharge load per unit area be w. If the water table is such that the retained soil remain fully submerged, in such a case the saturated soil results in increasing the weight of the backfill, decreases the angle of repose of the soil which ultimately amounts to increase in pressure on the wall.
The maximum and minimum pressure are given by. This constant factor of safety may not be able to cuonterfort the uncertainties associated with the random variables.