高填方渠道填筑施工三维模拟分析

摘要

The multi-layer filling construction of high embankment canal of Middle Route Project of South-to-North Water Diversion is numerically simulated by MIDAS FEM software combing with the construction practices. The simulation results show that the deformation induced by filling construction is mainly at central area of the canal bottom;with increase of filling elevation, the initial deformation is found at outside slope toe, then transferred to the central area of the canal bottom;the deformation of ca-nal slope surface increases with the filling construction. According to the simulation results, the filling construction at slope toe and canal bottom should be conducted seriously with strict quality controlling measures. And quality controlling measures should be adopted to ensure the safety of filling construction and operation.%利用MIDAS有限元分析平台，结合南水北调中线总干渠某高填方渠段工程实际，建立了填方渠道分层填筑施工的三维有限元分析模型。分析结果表明，渠道分层填筑施工时变形影响区域主要集中在渠道底部中心部位；随着填筑高度不断增加，变形影响范围由初始的渠道外坡脚向渠道底部中心转移，最后发生在渠道底部中心部位；渠道内外坡面变形也随着填筑高度的增加而相应增大。根据填筑施工模拟结果，在渠道填筑初期，内外坡脚和渠道底部中心部位应严格按照设计参数进行填筑施工，并适当加强质量控制措施，确保渠道填筑施工及后期运行安全。