Research On The Mechanical Characteristics Of Slope Support Of Anchor Cable And Anti-slide Pile

With the development of economy and society,many large-scale traffic engineering,hydraulic engineering and construction engineering involve the excavation and transformation of natural slopes.Digging slopes generally require supporting measures to prevent landslide disasters.In common supporting structures,anchor cables and anti-slide piles are widely used in slope support because of their superior anchoring and anti-slide performance.However,the current standard method has some imperfections in calculating the stress of anchor cables and anti-slide piles.How to determine the actual stress state of anchor cables and anti-slide piles is a very worthy research topic.Therefore,this dissertation studies the stress of two common supporting structures,anchor cable and anti-slide pile.For the anchor cable support,as the slope is excavated and the anchor rods are applied layer by layer during the construction,the forces at different elevation positions are not uniform.It results in that some supporting structures to reach the resistance limit when the slope was damaged,but some supporting structures had not yet exerted all the resistance.At the same time,different slope failure modes also affect the degree of synchronization of anchor cable resistance.From the perspective of considering the construction process and failure mode,the dissertation uses the incremental method and stress-displacement field to study the position of slope reinforcement.It is considered that during the construction process,according to the calculation of anchor cable reaching the ultimate resistance at the same time,the result is dangerous.The incremental method should be used to calculate the layer-by-layer stability of the excavation,determine the degree of resistance of the anchor cable at different locations.At the same time,a reasonable reinforcement position should be selected according to the failure mode of the slope.The retrogressive landslide should focus on strengthening the foot of the slope,and the thrust load-caused landslide should focus on strengthening the upper and middle parts.For the anti-slide pile support,it can play a good supporting effect in the case of vertical excavation of the slope.However,the results of the total earth pressure above the sliding surface obtained by different specifications are different,and sometimes even vary greatly.In view of the above deficiencies,the dissertation compares various normative methods.The studies show as follows: First,the vertical force balance is not considered in the transfer coefficient method.When the sliding surface is small and the pile surface is smooth,the calculation result of the horizontal earth pressure is too small.Second,The foundation pitgrading method simply equates part of the grading soil to a load and then transmits it to the pile according to the diffusion angle.This simplified calculation method is only suitable for the calculation of small grading heights.Third,the reaction force balance method proposed in the dissertation has a wide range of applicability.It can not only calculate the Coulomb earth pressure results,but also calculate the Earth pressure of curved sliding surfaces or other irregular sliding surfaces.