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针对新旧路堤的不均匀沉降问题,结合山区高填方加筋工程,开发离散-连续耦合程序,局部加筋区域采用离散元PFC模拟,外围区域采用连续单元FLAC模拟,分析土工格栅在新旧路堤的受力分布,研究加筋区域土体细观参数的变化,揭示土工格栅处治新旧路堤的细观机理。结果表明:离散-连续耦合方法可作为精细化分析的有效手段;在沉降未达到稳定前,细观上加筋层孔隙率逐渐减小,接触数增大,滑动比变化十分剧烈,宏观上土体进一步压密,加筋层中的土工格栅拉力逐渐增大,筋材加筋作用开始显现;在沉降稳定后期,加筋层孔隙率进一步减小,部分区域孔隙率增大发生剪胀,滑动比数值均较小,一般在8%以下,宏观上表现为沉降已完成。
In order to solve the problem of uneven settlement of old and new embankments, a discrete-continuous coupling program was developed based on the high-embankment reinforcement project in mountainous area. The locally stiffened area was simulated by discrete element PFC, and the continuous area FLAC simulation was used in the surrounding area. Of the force distribution, research reinforced region soil mesoscopic parameters of changes, reveal the geogrid treatment of old and new embankment meso-scale mechanism. The results show that the discrete-continuous coupling method can be used as an effective method for the refinement analysis. Before the subsidence does not reach the stable level, the porosity of the stiffened layer decreases gradually, the contact number increases and the sliding ratio changes very sharply. Body further compaction, the geogrid reinforcement in the reinforcement layer gradually increased, tendon reinforcement began to show; in the late settlement stability, the reinforcement layer to further reduce the porosity, partial porosity increased dilatation, Sliding ratio values are small, generally below 8%, macroscopically, the settlement has been completed.