Analysis of fracture reliability of anti-slide deep pile reinforced slope under flood effect

To obtain main crack location and fracture reliability characteristics of anti-slide pile, which was taken as concrete deep structure, the flood load contribution, statistical parameters, landslide pressure and earth pressure have been analyzed. In the process of crack propagation, the tie rod arch was found. Then, equivalent bending moment and concentrated loads formula were built along pile loaded side, where the main crack appeared around them. Furthermore, the analytic equations of stress intensity factor and the complex I–II crack propagation direction were proposed based on fracture criterion of the maximum circumferential stress. Moreover, the displacement is analyzed and the crack propagation direction is characterized by tie rod arch, in addition, the mode is consistent with complete pile. The confidence interval of the main crack location at the pile loaded side is determined with 95% probability according to the criterion of the formation of the main crack at the location of the minimum landslide thrust horizontal component. Taking flood load, landslide pressure and earth pressure as basic random variables, applied center point method, the analytical formula of fracture reliability index of anti-slide deep beam pile was established. Simultaneously, the new model experiment and example were conducted to verify these formulas confirmation. It is seen that the results obtained by the two methods are in good agreement. The confidence interval of main crack position in load section has been verified. Furthermore, the adverse effects of flood load and holding time are more significant than that of landslide thrust and earth pressure on the fracture and bearing characteristics of anti-slide pile.