Reinforcement Mechanism And Engineering Application Of Pre-stressed Anchor Cable With Dispersive

The pulling resistance of ordinary anchor cable with concentrated tension(OACCT)is mainly achieved by the cementing action between anchor cable of anchorage section and grouting body,which will cause uneven stress distribution in anchorage section and bond stress concentration at the near end of anchorage segment.In order to deal with the defects of OACCT in the application of structural engineering,a new pre-stressed anchor technology with dispersive pressure(PACDP)has been presented in the field of engineering at home and abroad.The design principle of the new anchor cable,in essence,is dispersing the pre-stress into the rock and soil at various depths by several non-bonded steel strands with varying length and steel bearings to form multi-section anchorage units.An example is given on a reinforcement project of pre-stressed anchor cable with dispersive pressure on the left high slope in highway S202-K5+300-K5+634 in this paper.The stability of high soil slope with that new anchor cable and the mechanical mechanism are studied by using finite element analysis software.The contributions and conclusions are listed as follows:(1)The stability of the cutting high slopes in highway S202-K5 + 300?K5 +634 is compared and analyzed before and after the implement of frame-type pre-stressed anchor cable with dispersive pressure based on arrangement principles of frame pre-stressed anchor cable.Feasibility analysis of the pre-stressed anchor to reinforce high soil-grade slope is also given here.The first part helps to give a basis of improving the work system inside the cable and the engineering application of PACDP.(2)By utilizing the finite element software of Abaqus,the mechanical mechanics of PACDP on the left side cutting slope in K5 + 300?K5 + 634 is analyzed systematically and quantitatively.The axial stress of the grouting body in the anchorage section of PACDP is equivalent to 1/3 of that of the ordinary pull-type anchor cable(3 is the number of the steel bearings in the model).There is no large displacement of the grouting body in the proximal end of the anchoring section.Meanwhile,the shear peak is smaller at the interface between the rock-soil mass and the grouting body,and the shear stress is also distributed evenly.What's more,the requirement of the peak strength of rock-soil mass is low.PACDP can greatly improve the anchor force of the anchor section.It can be proved that PACDP is more suitable for strengthening soft soil high slope than OACCT.By comparing and analyzing models of PACDP with different numbers of steel bearings in the anchorage section,the conclusion can be drawed that it is possible to reduce the axial stress of grouting body and rock-soil mass,and increase the anchoring force of the anchoring section by increasing the number of the steel bearings.(3)The construction technology of PACDP is summarized by the example of reinforcement on the left side cutting slope in K5 + 300?K5 + 634.The slope's stability monitoring method is also explained in details.Monitoring data showed that it is possible to apply reinforce the high slope of the soil-like roadbed.