Centrifuge Model Test Investigation on Deformation of Deep Excavation with Frame Top Down Method

Abstract:

Taking one large deep excavation as the research background, this paper compares the effect of deformation control of the frame top down scheme and the traditional top down scheme through centrifugal model tests. In addition, it further studies the relationship between the maximum wall deflections and the maximum ground settlements, as well as the size and scope of ground settlements. The test results show that the excavation induced maximum ground settlements using frame top down method δvm is 0.35～0.7 times of the excavation induced maximum wall deflection δhm, and unsupported exposure time has some effect on δvm/δhm. The predicted results by empirical prediction method based on measured data is much different from the test results. Excavation induced performance using frame top down and traditional top down construction schemes is similar, and the excavation induced performance using frame top down scheme can be controlled effectively. The conclusion of this paper has significant referential meaning for designs and constructions of actual engineering.

Key words:excavation engineering; frame top down method; deformation behaviors; centrifuge model test