Underground structure engineering load reduction filling

With the continuous advancement of science and technology, an increasing number of underground projects are thriving in China's engineering sector. The application of lightweight soil in structural load reduction is also becoming more widespread, particularly in the backfilling of subway tunnel roofs.

Subway construction typically occurs in bustling urban areas, with many sections employing open-cut methods and the excavation areas being municipal roads. After the completion of the subway tunnel structure, the area must be backfilled and traffic restored.

Modern architecture emphasizes green environmental protection and aesthetic naturalness. Many commercial roofs in design incorporate greenery, often using natural soil for full covering in the conventional construction process. However, ordinary soil has high water absorption rates, poor permeability, heavy self-load, and requires large equipment for construction. Under natural absorption conditions, each cubic meter can reach about 2.5 tons, which is approximately five times the weight of foamed concrete.

Due to its advantages such as low bulk density, light soil is now being gradually promoted and used in green roofs.