Deep Excavation and Improvement of Passive Earth Reaction in Weathered Chalk: Design with Deep Soil Mixing or Concrete Cross Wall Solutions-Video

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At Pont de Sèvres station, soft, weathered chalk and nearby buildings required strict control of diaphragm-wall movement. Engineers improved passive earth pressure using deep soil mixing across most of the excavation and five unreinforced concrete cross-walls near a sensitive building. They modeled the concrete walls as soil clusters, deriving equivalent parameters for design and finite-element settlement analysis. For deep soil mixing, probabilistic models represented potential column deviations and helped estimate stiffness. As excavation approached its base, measured wall deformations remained well below contractual limits, indicating the solutions were performing as expected.

Keywords

Pont de Sèvres station

diaphragm-wall movement

deep soil mixing

soil-structure interaction

finite-element settlement analysis