How can I seal my excavation in DeepEX?

Excavating below the general water table in permeable soils can often lead to significant groundwater flow into the excavation pit. To manage this, effective measures must be taken to control the groundwater table and ensure the stability and integrity of the excavation.

When constructing base slabs within the excavation pit, these slabs typically act as barriers against groundwater. However, this can lead to significant uplift water pressures, which pose a risk to the structural integrity of the base slab and the overall excavation system. To counteract these pressures, additional preventive measures such as tiedowns are often necessary.

Sealing the Excavation in DeepEX

DeepEX, our advanced shoring design software, offers a solution to this challenge. Here’s how you can use DeepEX to seal your excavation and manage groundwater pressures effectively:

Selecting the Sealing Option:

In DeepEX, you can choose to seal the excavation by creating a liner at the bottom of the base slab. This liner acts as a barrier, preventing groundwater from seeping into the excavation.

Figure 1: Option to seal the excavation in DeepEX

Hydrostatic Pressure Consideration:

When the excavation is sealed, DeepEX considers the water pressures to be hydrostatic below the excavation level. The software calculates these pressures using a simplified flow method (1D flow) above the excavation, providing an accurate representation of the forces acting on the base slab.

Figure 2: Water pressures on a sealed excavation model – DeepEX software

Vertical Pressure Display:

DeepEX displays the generated vertical pressures on the base slab, allowing you to visualize and understand the impact of groundwater on your excavation design.

Figure 3: Vertical pressures on a DeepEX model with sealed excavation

Finite Element Analysis (FEA) Integration – Designing Preventing Measures

With the DeepEX 2D Finite Element Analysis engine (2D FEM), you can include additional structural elements such as tiedowns and foundation piles. These elements are crucial in supporting the base slab and counteracting the uplift water pressures.

Figure 4: DeepEX FEM analysis results – Sealed excavation with tiedowns

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