陕甘宁盐环定扬黄八干渠渠道衬砌关键技术研究

Research on the key technology of eight trunk canal lining from the Yellow River to Yanhuanding in Shanganning

在陕甘宁盐环定扬黄工程八干渠改造中,通过现场调查,分析研究了渠道衬砌的破坏原因,充分结合工程实际,选择合理的衬砌方案,渠道砌护改造以防渗、防冻为主。在防冻胀方面,采取了现浇混凝土圆弧坡脚、聚苯乙烯板保温措施,减轻了渠道的冻胀破坏;在有侧向渗水段落,渠底采用金属格宾石笼排除渠道基土内水分、消除流沙段边坡滑塌的排水措施。根据渠道浅积水段和深积水段不同状况,充分考虑了冻胀、边坡滑塌、地下水位高等多种不利因素,通过综合分析进行方案比选,提出因地制宜的砌护方案,同时对渠道衬砌中的主要技术指标做出了具体要求。

In eight trunk canal reconstruction of water lifting project from yellow river to Shanganning Yanhuanding,the reconstruction scheme for seepage prevention and antifreezing of canal lining were proposed by field investigation and combining the practical engineering.Measures including cast-in-place concrete curved slop toe and polystyrene board thermal insulation were taken to against the damage caused by frost heaving.Meanwhile the metal gabion stone cages were used to remove the canal based soil moisture and eliminate the drainage from quicksand slope slumping part in lateral seepage section.Additionally,suited masonry measures to local conditions were presented on the basis of comprehensive considering unfavorable factors including the frost heave,slope collapse and high underground water level and analysis.At last,some special technical indexes on canal lining masonry were pointed out.