Abstract: This paper presents a deep excavation support case history of Jingchu Mansion in Jiangxia District, Wuhan City. The application of soil mixed tangent pile wall inserted with hot rolled steel beams into the preformed hole plus the reusable hot formed ground anchor in the deep excavation in the Wuhan old clay strata is the focus of this paper. The deep excavation used soil-cement mixed column tangent pile wall with hot rolled steel beam inserting into preformed holes plus one layer of reinforced concrete waler plus some local hot formed reusable ground anchors as the supporting structure. The excavation monitoring data indicate that, both the deformation of the supporting structures and the settlement of the adjacent buildings and utilities are controlled within the acceptable range. The innovative supporting structure could effectively reduce the construction cost and shorten the construction schedule and further provides references for the excavation supporting in similar conditions. The typical construction problems such as excessive excavation are also discussed in the paper.

Key words: Soil Mixed Wall with Hot Rolled Steel Beam in Preformed Hole, Old Clay, Deep Excavation Monitoring, Economic Benefit