路堑边坡锚杆(索)框架梁设计存在的不足及对策

Deficiency in Design of Anchors(cable-anchors)-frame for Cut Slope and Its Countermeasures

研究目的:通过阐述锚杆(索)框架梁加固路堑边坡的现状,对以往设计中存在的不足进行分析,根据加固边坡理论,分析锚杆(索)框架梁的耐久性,提出切实可行的锚杆(索)的防腐措施。研究结论:通过对以往设计中存在的不足分析后提出:锚杆(索)长度应根据边坡坡率、地层参数合理选定,并根据稳定性计算首先确定边坡潜在滑动面的位置,以确保锚杆(索)锚固段位于稳定地层内。锚杆(索)分别涂刷环氧树脂、氯磺化聚乙烯涂料、直接铁丝网物理隔离、或多种组合防腐措施后,由于这些措施有效隔离了腐蚀介质与钢筋(绞线)的接触,特别是物理隔离措施隔断了在其受拉时可能产生的裂缝的贯通,能起到很好的防护作用,从而有效保证其使用寿命。

Research purposes： Based on the introduction of the current situation of using anchors to reinforce the cut slope, the analysis is made for the deficiency in design of the anchors （ cable - anchors ） - frame for the cut slope. Based on the theory of reinforcing the slope, the analysis is made for the durability of the anchors （ cable - anchors） - frame, and the feasible antisepic measures are offered for the anchors （ cable - anchors） - frame. Research conclusions：From the analysis of the deficiency in the previous design, it is pointed out that the length of anchors（or cable -anchors） must be selected reasonably according to the slope -ratio and the bed parameters, and the potential sliding- surface of a slope would be determined on the base of the stability analysis at first for ensuring the anchors（cable- anchors） fixed in the stable bed. The anchors （or cable- anchors ） would be painted with epoxy, chlorosulfonated polyethylene coatings, or insulated by a iron wire -net directly, or the integrated antisepic measures would be taken for the anchors. Adopting these measures could insulate the touch of eroding matter with the reinforcements （cables）. Especially the physical insulation could cut off the continuity of the cracks caused by the tensile force, obtaining a very good protection effect and ensuring their service life availably.