Sequential Measurement and Analysis of Large Underground Retaining Structures by Diaphragm Wall Anchor for the Spring Area

Abstract

The performance of a diaphragm wall-anchor structure in spring area in Jinan city, China, is studied. Based on field measured data, lateral wall deflections, lateral soil movements, horizontal displacement of the capping beam, the maximum lateral wall deflection, ground surface settlement, lateral earth pressures on diaphragm wall, internal force of diaphragm wall, axial anchoring forces, settlements of adjacent building, and pore-water pressure are investigated. The results indicate that the maximum deflections of the lateral wall are 0.07%∼0.18% of the excavation depth (He). The ground surface settlement influence zone extends beyond 2.5He from the pit for this project. The δv,max ranges from 0.67 δh,max to 1.0 δh,max. The maximum lateral active earth pressures on diaphragm walls above the excavation bases range between 0.4He and 0.6He. The axial anchoring forces of the top three layers of anchors change significantly during the excavation while the axial anchoring force of the fourth layer of anchor is constant. The deformation of surrounding building has three stages, including a uniform subsidence stage, an accelerated subsidence stage, and a stable subsidence stage.

Providing stability to a highway cut in a landslide area with the use of diaphragm wall panels

“…In order to give stability to the cut, anchored diaphragm wall panels oriented towards the slope were used. This is an unusual solution, because underground walls are primarily used as a securing and sealing element in deep excavations and foundations of buildings either for temporary excavation support or as part of the permanent structure [4][5][6][7]. Currently, the construction of individual diaphragm wall panels is being carried out on the construction site, and the upper part of the wall is being dug out for the purpose of its multi-level anchoring.…”