Abstract:

Mashui River large bridge is a key project of the Shanghai-Chengdu national trunk highway; the slope stability of Mashui River large bridge is difficult to be evaluated due to the complex geological conditions and tectonic evolution. How to reflect the geological conditions and tectonic evolution in slope stability analysis is very important for the result objectivity. According to the geological structure and tectonic character of rock mass, the author summarized the deformation and failure mode of the slope. On the basis of the failure mode, the numerical model with finite difference method was built. The stress and deformation state were simulated with the slope under three states, such as in natural state, the action of a bridge and the 50 meters rising of water level. The results indicate that the slope stress field changes very much locally and the influence depth reaches 50 meters. Therefore, an increased cross-section of pile foundation is suggested to improve its bearing capacity.

Key words: Mashui River large bridge, slope, network map of structural plane, stability, numerical simulation