Anchorage design analysis and field monitoring of large key blocks in high and steep rock slope

Abstract

One of the main failure modes of rock slope is the instability of the key block formed by cutting combination of structural planes. In view of the block stability and control problem caused by the combination of structural planes in the high and steep rock slope in Southwest China, the key block theory method and on-site monitoring method are used to study the stability of the key block after the excavation of the slope, the optimization of the design parameters of anchor cable support, and the deformation characteristics and change laws of the slope with the construction process are analyzed. The research results show that the large block formed by the discontinuity layer and layer fracture of the slope reaches 26000 m3, sliding along the structural plane on both sides, with low safety factor. The safety monitoring data show that the block is stable after the reinforcement with anchor cable.