Research On Relationship Between Deformation And Earth Pressure On Support Structure Of Foundation Pit In Soil Active Area

This paper discussed the relations of deformation and earth pressure on support structure of foundation pits. By monitoring and numerical simulation of the actual excavation, the following conclusions were reached:1,The earth pressure at different operating conditions showed different changes. First of all, earth pressure curves showed clear non-linear, and active earth pressure of lateral excavation becomes larger due to the supporting role. Local soil pressure appeared in undulate incremental changes.2,Continuous wall of horizontal displacement at different conditions have different performance. Being part of a supportive role, as well as relatively small part of the depth of excavation, displacement changes were big at both ends and small in the middle. Wall displacement increased in the depth of excavation. When there was no support, displacement dramatically was larger. The maximum displacement appeared in the excavation works near the surface.3,Horizontal displacement and earth pressure relations on continuous wall have shown a clear non-linear relationship, but the performance of non-linear linear has been different. Part of horizontal displacement and earth pressure on Continuous wall showed exponential curve, and some showed sine curve, indicating that earth pressure calculations in a project should use different function for different deformation.4,Simulated and measured values in curve fitting were better; there is different that simulated values for the horizontal displacement was greater than the measured value; earth pressure simulated value was less than the measured value.5,Based on the research results in change and relationship of horizontal displacement and internal force, with the dynamic process of excavation, a way on the excavation design from stress control to deformation control had reached. That is, when the stress meet strength condition, then by the displacement conditions on the continuous wall deformation control to meet the deformation requirements.