Analysis of Deformation Data of a Deep Foundation Pit in Karst Poor Geological Conditions
Abstract
This paper is based on a deep foundation pit project under the geological conditions of karst. The monitoring data is analyzed, and the deformation rule of the foundation pit is obtained. At the same time, the influence factors of foundation pit deformation are studied, and the relationship between the displacement of slope of foundation pit at different stages is studied. Get conclusions as following, in the excavation of the foundation pit, the different supporting forms of foundation pit have great influence on the horizontal displacement of foundation pit. The horizontal displacement deformation of slope at the excavation stage is larger, accounting for 68%~78% of total deformation. The horizontal displacement deformation of slope at the backfill stage is significantly smaller, accounting for 22%~32% of the total deformation.
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Introduction
The deformation analysis of foundation pit is based on the phenomenon of deformation. The causes and factors of deformation are analyzed. Thorough study of deep foundation pit deformation mechanism, the foundation pit deformation is effectively controlled, and the stability of foundation pit is maintained. At present, at home and abroad, many scholars have studied the deformation of deep foundation pit. Woo[1] ,Ou[2] ,Wong[3] studied the relationship between the maximum lateral movement of support structure and excavation depth of foundation pit. Yu jianlin and gong xiaonan[4] verified the influence of space effect on deep foundation pit. Sun jianping and wei huanwei[5] showed that the horizontal displacement and subsidence ratio of slope top of foundation pit gradually tended to value over time. This paper mainly studies the effect of different supporting forms on the deformation of deep foundation pit. Meanwhile, the relationship between the displacement of slope of foundation pit at different stages is studied.
Conclusion
1 In the foundation pit project, the horizontal displacement and settlement of slope changes over time gradually increasing.
2 In the excavation stage, different supporting forms have great influence on the horizontal displacement of foundation pit slope. The effect of different supporting forms on the vertical displacement of the excavation stage is small.
3 The horizontal displacement of the excavation stage accounted for about 68%~78% of total displacement, the vertical displacement of slope deformation accounted for about 61%~67%.
4 Two different kinds of support form have very little effect on the vertical displacement and horizontal displacement of foundation pit slope.
5 In the backfill stage, horizontal displacement is smaller, accounting for about 22%~32% of total displacement. The vertical displacement of slope deformation is smaller, about the total amount of deformation 33%~39%.