Simulation Study On Strengthening Dangerous Rock Collapse Mass With Energy Dissipation Composite Frame Under Earthquake

Dangerous rock mass is common in mountain slopes in China.Most of these areas are located in earthquake-prone areas.Under the action of earthquakes,dangerous rock mass is very easy to form collapse geological disasters,causing major losses to the safety of human life and property.Therefore,more and more attention has been paid to the treatment of dangerous rock collapse,and the active reinforcement technology has been widely used because of its strong initiative and good reinforcement performance.So far,the development of the existing active reinforcement technology has strong limitations,and the research on active reinforcement of dangerous rock collapse slope under earthquake action mostly takes the dynamic response of rock slope as the main research objective,and few studies have been carried out on the mechanical properties of the support structure under dynamic load,which limits the development of the active reinforcement technology and its application in engineering.In this thesis,a new type of energy dissipation composite frame with active energy dissipation and damping effect is developed.Taking the new type of energy dissipation composite frame as the research object,it is compared with the hard-braced reinforced structure.Through the ABAQUS finite element numerical simulation research method,the seismic wave is applied to the dangerous rock collapse,so as to carry out in-depth and systematic research on the dynamic response of the support measures under the earthquake.The research aims to reveal the reinforcement advantages of the new energy dissipation composite frame,explore the energy dissipation mechanism and energy dissipation capacity of the energy dissipation device,and explain the effect of the energy dissipation device in reducing the bearing capacity of the supporting pile.The main conclusions are as follows:(1)Based on the background of the existing active support technology for the reinforcement of dangerous rock collapse,three new energy dissipation composite frames are developed,and the design idea and energy dissipation principle of each new energy dissipation composite frame are introduced in detail.After the scheme comparison,the new energy dissipation composite frame with a primary energy dissipation structure is finally selected as the support measure for the reinforcement of dangerous rock collapse in the finite element numerical simulation.(2)Compared with the rigid-braced reinforced structure,the energy dissipation device of the new energy dissipation composite frame significantly reduces the reaction of the supporting structure under the earthquake,and plays a good role in energy dissipation and vibration reduction.(3)Compared with the hard-braced reinforced structure,the energy dissipation device of the new energy dissipation composite frame under seismic action has obviously absorbed more seismic energy and has good energy dissipation effect.(4)By comparing the stress nephogram of the two strengthened structures under the same seismic wave and acceleration amplitude,it is found that the damage of the new type of energy dissipation composite frame mainly occurs in the steel ring of the energy dissipation device and the connection between the steel ring and the end plate,while the damage of the connector hard support reinforced structure mainly occurs in the column base of the support column,and the new type of energy dissipation composite frame is obviously superior to the hard support reinforced structure.