工程泥浆制备流态回填材料技术研究与综合效益分析

Technical Research and Comprehensive Benefit Analysis of Flowable Backfill Materials Prepared from Engineering Slurry

摘要:

针对钻孔灌注施工产生的废弃工程泥浆含水率高、处置难，而传统泥浆脱水干化处置技术成本高、碳排放量大和泥饼难利用等问题，研究提出工程泥浆制备流态回填材料用于工程回填利用技术方案，依托上海某高速公路交通功能完善项目完成工程应用，并对技术经济性和碳减排效益进行分析。结果表明，工程泥浆制备流态回填材料的7 d和28 d强度达0.65 MPa和1.12 MPa，坍落扩展度达760 mm，现场单点浇筑后流态回填材料可在承台侧壁四周自密实回填，回填效果良好。与工程泥浆脱水干化处置技术相比，该技术单方工程泥浆处置成本可减少约17.50 %，碳减排约45.59 %。

Abstract:

In response to the issues of high water content and difficult disposal of waste engineering slurry generated during bored pile construction, as well as the high costs, high carbon emissions, and difficulty in utilizing mud cakes in traditional slurry dewatering and drying disposal technologies, this study proposes a technical solution for preparing flowable backfill materials from engineering slurry for use in engineering backfilling. The technology was applied in a traffic function improvement project of a Shanghai expressway, and an analysis of its technical-economic feasibility and carbon reduction benefits was conducted. The results show that the 7 d and 28 d compressive strengths of the flowable backfill materials prepared from engineering slurry are 0.65 MPa and 1.12 MPa, respectively, with a slump flow of 760 mm. After single-point pouring on site, the flowable backfill material can self-compact around the sidewalls of the foundation cap, achieving good backfilling results. Compared to traditional engineering slurry dewatering and drying disposal technologies, the cost of disposing of engineering slurry per cubic meter with this technology can be reduced by about 17.50%, with a carbon reduction of about 45.59%.