Dynamic Response And Failure Mechanism Of Anchorage System Of Slope Under Earthquake

The geological disaster induced by earthquake is a research hotspot in the field of geotechnical earthquake engineering,and the seismic design of the slope dynamic response and the slope reinforcement structure of the earthquake are of great concern.Practice proved geotechnical anchorage technology has the characteristics of the seismic performance is superior,is widely used,but all of the often used in engineering of prestressed anchor,pull type prestressed anchor and pressure type prestressed anchor three main type of anchor seismic performance is still lack of deeper research.In this paper,considering the three anchor reinforcement soil,dual structure and rock slope,different type combination conditions,such as the dynamic finite element method(fem)simulation analysis of seismic slope in the process of dynamic deformation characteristics and anchor structure internal force variation law,and after three anchor reinforcement slope on the stability of the before and after the contrast research,to explore the effect of three kinds of reinforcement of slope anchor supporting differences.The following results and conclusions are obtained:(1)Under the action of earthquake,tension or stress model of the prestressed anchor structure on the slope deformation control effect had no significant difference between whole,but the full potential of binding the prestressed anchor reinforced slope deformation range significantly less than the prestressed anchor reinforced slope.(2)The acceleration peak of slope at the lower slope of the earthquake has a magnifying effect.Anchorage system of soil slope slope PGA amplification factor has obvious inhibitory effect,the control effect of different anchor system and has no obvious difference,but with the increase of the high slope of the inhibition effect weakened;The anchorage system has the same inhibitory effect on the slope surface PGA am plification coefficient of the binary structure slope,and the control effect of prestressed bolt support is better,but the influence of the slope height is not significant.The anchorage system has no obvious inhibitory effect on the PGA amplification coefficient of the rock slope surface.(3)The bolt axial force of the adjustment process relative to the earthquake loads leading to slope stress redistribution with hysteresis characteristics,in the process of seismic action,bolt axial force changes show that the oscillation rule,at the end of the seismic action of slope stress redistribution in the process of bolt axial force significantly increased.(4)The earthquake under the action of different types of slope anchor stress change rule of significant differences,for soil slope,the largest rise in binding bolt axial force,than before the earthquake increases by about 79%,increase pressure type anchor rod and pull type bolt axial force biggest increase 15%and 10%,respectively.For binary structure slope,the axial force of all bonded bolt is about 55%higher than before,and the largest increase is.The axial force of the pressure type bolt is the smallest,and the maximum increase is about 40%.In relative terms,the axial force growth of rock slope under earthquake action is not significant,the maximum increase is only about 2%.(5)The reinforcement of prestressed bolt is obviously advantageous to improve the overall stability of slope after earthquake.In the soil slope,the permanent deformation analysis and the slope stability analysis show that the slope anchorage effect of the pressure type bolt support is the best.The slope stability of the rock slope is the most stable.In the case of binary structure slope,there is no significant difference in the stability of the post-earthquake stability.