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以宜-巴高速公路某加筋土路堤断面为研究对象,结合现场监测数据,采用弹塑性有限元计算程序对加筋土-锚杆组合支护结构的变形受力特性进行研究,并针对筋材刚度、加筋间距、坡后锚杆连接与否等因素进行参数分析。主要研究结果表明:加筋土路堤中相邻阶梯水平位移变化幅度较大,且坡后台阶处出现较大不均匀沉降,需保证此处填土的压实度;加筋土路堤最大水平位移和垂直位移随着筋材轴向刚度的增加而减小;随着加筋间距的增加,加筋土路堤的安全系数相应减小,各加筋体承担的荷载不断增大;锚杆与加筋体连接情况下最大水平位移和垂直位移均较未连接的情况要小,安全系数提高。
Taking the section of reinforced earth embankment of Yibao Expressway as the research object, combining with the on-site monitoring data, the deformation and stress characteristics of the reinforced earth-rock bolting combined support structure are studied by the elastoplastic finite element program, Material stiffness, stiffened spacing, anchor connection or not after the slope and other factors parameter analysis. The main research results show that the horizontal displacement of adjacent steps in the reinforced embankment is larger, and the uneven settlement is larger at the back of the slope, so the compaction degree of the fill should be ensured. The maximum horizontal displacement of the reinforced embankment And the vertical displacement decrease with the increase of the axial stiffness of the tendons. With the increase of the stiffener spacing, the safety factor of the embankment decreases correspondingly, and the load of each reinforcement body increases. The maximum horizontal displacement and vertical displacement under the connection of the tendons are smaller than the ones without the connection and the safety factor is increased.