| The earth is now in an active period of earthquakes.In recent years,frequent high-intensity earthquakes have caused damage to people's lives and property.Due to the special location of the terrain in China,there are many natural slopes in the western region and the northwest region,as well as many artificial slopes in China's infrastructure construction and economic development.The prestressed slope reinforcement technology has a good supporting effect,strong anti-seismic performance,and can be used together with other reinforcement measures,which has a strong engineering application prospect.At present,the study on the stability of the prestressed anchored rock slope is still in the primary stage,which needs to be further studied.Rock slope of prestressed anchor,the author of this paper is that a special kind of slope type,using the research methods of combining theoretical calculation and numerical simulation,study the pressure type shear stress and axial force distribution characteristic of anchor cable anchorage segment,prestressed anchoring theory of dynamic response analysis of rock slope,the dynamic response law of rock slope and prestressed anchorage law of dynamic response of rock slope.The main work of this paper is as follows:(1)the research results in the field of dynamic stability analysis of rock slope at home and abroad are compared and summarized,including the seismic performance of common support structures,the anchoring mechanism of anchorage cables,as well as the failure modes and characteristics of anchorage structures.(2)the effects of pressure type anchor cable anchorage principle,consider the squeezing effect of borehole grouting and anchoring segment of anchor cable and rock soil interface cohesion,for the anchoring of the influence of shear stress and axial force,and the introduction of the strength reduction factor,through the theoretical analysis and mathematical deduction,the mathematical expression of the form,the pressure type anchor cable anchorage shear stress and axial force,and with the domestic scholar's research results were compared.(3)to study the dynamic stability of the prestressed anchored rock slope,establish the dynamic calculation model,and deduce the yield acceleration of the unstable rock mass by using the energy method and the analytical method respectively;The quasi-static method is adopted to establish the motion equation based on the block theory,and the mathematical expressions of the sliding surface displacement and the axial force of the anchor cable are obtained by theoretical derivation under the action of simple harmonic load and random earthquake load respectively,and the mathematical expressions of the axial force of the anchor cable are verified by calculation examples.(4)taking a rock slope engineering with a single weak layer as the background,the dynamic response law of the rock slope and the influence of seismic parameters and slope parameters on the response law were studied by FLAC3 D simulation and analysis software;The common rock slope types and the dynamic failure modes and characteristics of different slopes are summarized.(5)the static stability of the anchored rock slope is calculated by using the strength reduction method and the FLAC3 D program against the background of an actual prestressed rock slope;Using Matlab program,the dynamic safety factor of slope is calculated.Using FLAC3 D program to simulate the dynamic response law of rock slope after the adoption of prestressed reinforcement technology,the influence of earthquake parameters,anchorage parameters and other factors on the dynamic response law was studied,and the influence factors of axial force of anchor cable were analyzed. |
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