EFORMATION MECHANISM AND STABILIZATION MEASURES OF BROKEN GRANITIC ROCK SLOPE THAT EXPERIENCED WENCHUAN EARTHQUAKE

The stability of rock slope with cataclastic texture is controlled by joints that are crossed each other, and affected by terrain, rainfall and other factors. This paper presents a case study on the stability of a granitic rock slope with broken and cataclastic structures. The geological condition and the rockmass structure properties were investigated in detail. This study further took into account the data that are revealed during construction and monitoring of the slope. It thoroughly analyzed the slope deformation mechanism during the excavating. On the basis of the slope stability results, it suggested the stabilization measures. The results show that the slip surface in top of the slope was formed by unloading cracks. The other slip surfaces were developed under the effects of two groups of structural planes. In particular, the multi-point extensometers buried in the slope recorded the slope deformation characteristics during the 5.12 Wenchuan Earthquake and afterward railfalls. Then after the supporting, the slope deformation was obviously under the control.