|
|
|
| Analysis on deformation-failure mechanism of counter-tilt hard rock high and steep slope |
| HU Huihua，ZHANG Peng，GONG Daoping |
| (Hunan Provincial Communications Planning，Survey and Design Institute，Changsha，Hunan 410219，China) |
|
|
|
|
Abstract For the counter-tilt hard rock slope，the deformation mechanism and failure mode are controlled by rock mass structure. Based on the detailed investigation of the development and intersecting combination relationship of different structural planes in a highway slope，the deformation and failure process of the slope and the deep monitoring data are comprehensively analyzed. It is found that the deep deformation is controlled by the fault F13，the middle layer potential slip surfaces are consist of the fault F14 and part of tracing joints，and the shallow potential slip surfaces are consist of joints，weathering fracture，and unloading crack. A geological analysis model of 11 sliding surfaces in deep layer，middle layer，and shallow layer is constructed. Then the rigid body limit equilibrium analysis and discrete element simulation are carried out to summarize the deformation and failure mechanism of the counter-tilt hard rock slope. The results show that under the conditions of scouring，cutting and artificial disturbance，the slope will deform and destroy along the potential sliding surfaces with different depths and different combinations of structural planes. Through comparison of multiple schemes，treatment of anti-pressure foot protection combined with anchor bolt reinforcement，supplemented by drainage measures is proposed. After eight years of operation and monitoring，the scheme has proved to be safe，economical and reliable.
|
|
|
|
|
|
|
|
|
2020, Vol. 39 
