13th International Conference on Fracture June 16–21, 2013, Beijing, China -6- 3.1. Project overview Artificial hollowed piles are used to pile foundation of Ouhai Sports Center Stadium. Effective pile length is 4.00m ~ 30m, pile diameter is 600mm ~ 1000mm, the pile concrete is C25. The project total pile is 129, according to the verify results of low strain detection and excavation, 9.6% of the damage occurred at 7.4m from the top of the pile of NO.71 piles. No. 71 piles pile length is 21m, diameter is 1m. Real damage of No.71 pile is shown in Fig.1. 3.2.Finite Element Modeling Applying of finite element software ANSYS, according to the design drawings, we establish finite element model of the role of interaction between pile and soil for NO.71 pile (Fig.2(a)). According to actual damage on the No. 71 pile, pile model with cracks was established at 7.4 meters from the top of the pile. Crack depth is 9.6% of the diameter of pile foundation (Fig.2(b)). The element type of pile foundation model is SOLID45. Pile-soil interaction applies the nonlinearity the spring element COMBIN139 to simulate. In order to establish the finite element computation model which are in line with the environment of the actual engineering, model updating technology based on the measured data was used to improve the finite element model. （a）Site excavation detection （b）Detection of low strain Figure 1 The actual damage location of No. 71 piles （a）Before damage （b）After damage Figure 2 Finite element model of pile-soil interaction 3.3.Efficient mode selection
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