Law Of Prestress Loss Of Existing Anchor Cable In Slope And Its Influence On Long-term Stability

Prestressed anchor cable reinforcement technology can give full play to and improve the strength and stability of geotechnical engineering,which is widely used in the field of geotechnical engineering.However,empirical formula is now often used to determine the amount of prestress loss,and the research on the long-term rule of prestress loss and the long-term stability caused by it is not enough.First of all,based on the Kelvin solution of infinite body theory,the transfer mechanism of anchorage force of prestressed anchor cable is verified by an example.According to the different stages of the whole process of prestress loss,this paper analyzes the main influencing factors of prestress loss in the process of short-term loss and long-term loss.In the long-term operation of slope engineering,the long-term loss mechanism and main influencing factors of prestress are discussed under the influence of creep damage of grouting body and long-term creep of rock mass.Secondly,this paper uses FLAC3D finite difference software to establish the numerical model of rock slope anchored by prestressed anchor cable.Starting from the grouting body rock interface in the long-term service anchor cable anchoring system,the numerical simulation test is carried out to explore the long-term relaxation rule of prestress under different working conditions when the mechanical properties of grouting body suffer from time-dependent damage,as well as the displacement stress-strain field and long-term stress-strain field of slope Stability and stability.Finally,the numerical simulation test of prestressed anchor cable slope considering creep effect is carried out,and the long-term development trend of prestress loss is discussed from the distribution law of axial force under different creep conditions.By comparing the displacement field,stress field and strain field of slope,the influence of creep effect of rock mass on displacement stress-strain field of slope is analyzed,and the safety factor,shear strain increment and plasticity of slope are compared.The influence law of long-term stability of slope can be found in this area.The results show that the long-term prestress loss is caused by the time-dependent damage effect of the grouted anchorage cable,and the prestress value tends to be the same after the slurry damage is stable,and the long-term stability of the slope also decreases with the development of time;under the influence of the long-term creep of the rock mass,the prestress decreases to basically the same as the creep develops to the stable stage,and the long-term stability decreases.