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东山供水工程部分PCCP输水管道沿昌源河河滩地埋设,揭示地层岩性以第四系全新统洪冲积卵石混合土为主,局部夹级配不良砾石层或砂层。在这种地质条件下,PCCP沟槽开挖料难以满足回填要求,为确保该段PCCP安装质量,做到安全、环保施工,提高经济效益,文中对该段管道施工进行了详细研究,并总结出了PCCP在类似地质条件下较为合理的回填方案。
The PCCP pipeline of Dongshan Water Supply Project was buried along Changyuan River and flood plain, revealing that the stratigraphic lithology is dominated by the flood-gravel cobblestone of the Quaternary Holocene, with partial grading of poor gravel layer or sand layer. Under such geological conditions, it is difficult to meet the requirements of backfilling with PCCP trench excavation materials. In order to ensure the installation quality of this section of PCCP, to achieve safety and environmental protection and to enhance economic benefits, the construction of this section of pipeline is studied in detail and summarized PCCP out of similar geological conditions in a more reasonable backfill program.