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DC Underpinning analyzes building underpinnings and retaining walls.

An arbitrarily shaped unit of underpinning, defined as a closed polygonal line, is loaded by:

• active, increased active earth pressure or earth pressure at rest behind the wall
• passive earth pressure in front of the wall
• water pressure behind and in front of the wall, eventually the base water pressure below the wall:
• imposed loads (forces and moments) on the wall
• imposed loads (limited and unlimited area loads) on the ground as live and dead loads.

In case of an inclined back edge of the unit of underpinning, the earth pressure depends on the inclination angle. Also, the gravity axis of the wall runs inclined with inclined front and back edges, and horizontal and vertical loads are converted in components along and across to the system axis. In case of imposed loads on the wall and vertical components of the earth pressure by the wall skin friction angle, the moment component by the eccentricity is considered. The calculation of the section forces for the unit of underpinning is performed at the buckled bar chain, considering thus eventual bends in the gravity axis.

The ground may be arbitrarily layered. The program automatically considers the water level by using the specific weight under buoyancy. The ground surface may have – outgoing from the wall head – up to two slopes or ground surface offsets, as well as one slope in the construction pit. The program automatically determines the effects on the earth pressure distribution, as well as the effects with imposed loads on the ground, as e.g. the distribution of earth pressure at rest caused by limited imposed loads according to Fröhlich.

In case of different water levels in front of and behind the wall and permeable layers, we consider the flow pressure. Additionally, the program calculates the safety against hydraulic ground failure.

You may select various redistribution figures for the earth pressure.

The program calculates the wall unit as a cantilever beam or as simple or continuous girder. The wall foot may be supported as moveable, elastic (spring) or fixed, and considering torsion - jointed, elastic (rotating spring) or fixed. Anchors may be applied as bearings (calculation of the anchor force = supporting force) or as predefined forces (anchor force = concentrated load).

You may optionally iterate the required wall length in different excavation stages.

The program outputs the earth pressure distribution, loading and section forces of the wall, deformations, the eccentricity concerned e/d, the concrete stress and the pressure-zone width in detail. The required anchor lengths may be determined with the analysis of the deep sliding plane, with a detailed printout of the anchor position, inclination, force, length and safety factor, as well as optionally the forces influencing the analysis.

Additionally, the program calculates the following:

• safety against sliding
• bearing capacity and
• the settlement.

An additional option DC Underpinning Optimization enables the automatic optimization of the underpinning in two variants:

• Optimization of the anchor forces, so that the moments of support and span should have an equal value and no eccentricity occurs at the wall foot
• Optimization of the wall width by moving different points, so that all the performed checks are completed.

Program available in English language

Brochure

BROCHURE_DC_UNDERPINNIG.pdf 75.01 Kb