应用研究 2024年 第53卷 第21期

DOI: 10. 7672 / sgjs2024210041

废弃泥浆改性机理与工程应用研究

张慧乐¹,丁显坤²,杨发¹,吴丹¹,王述红²

作者简介:

张慧乐,高级工程师,E⁃mail:zhanghuile@ cribc. com

作者单位:

1.中国京冶工程技术有限公司,北京 100088; 2.东北大学,辽宁沈阳 110819

基金项目:

∗辽宁省重点研发计划(2019JH2 / 10100035)

摘要:

为妥善处理并利用岩土工程施工产生的废弃泥浆,首先完成原材料选取和材料基本性能测试,然后进行多因素试验设计,通过无侧限抗压强度试验研究不同水泥和玄武岩纤维掺量对废弃泥浆改性材料力学性能的影响,并利用扫描电镜(SEM)试验从微观角度分析废弃泥浆改性机理,最后依据试验结果开展实际工程应用研究,验证废弃泥浆应用效果。试验结果表明,掺加水泥和玄武岩纤维可有效改善废弃泥浆改性材料力学性能,掺加玄武岩纤维后改性材料压缩变形阶段有效缩短;微观上,水泥与泥浆颗粒形成胶结团粒,玄武岩纤维将胶结团粒和泥浆颗粒更有效地连接,形成更紧密的整体结构单元。

English:

In order to properly deal with and utilize the waste mud produced by geotechnical engineeringconstruction, the selection of raw materials and the basic performance test of materials are firstcompleted, and then the multi⁃factor test design is carried out. The influence of different cement andbasalt fiber content on the mechanical properties of waste mud modified materials is studied by unconfinedcompressive strength tests, and the modification mechanism of waste mud is analyzed from themicroscopic point of view by scanning electron microscope ( SEM ) tests. Finally, the practicalengineering application research is carried out according to the test results, and the application effect isverified. The test results show that the addition of cement and basalt fiber can effectively improve themechanical properties of waste mud modified materials, and the compression deformation stage ofmodified materials is effectively shortened after adding basalt fiber. Microscopically, cement and mudparticles form cemented agglomerates, and basalt fiber connects cemented agglomerates and mud particlesmore effectively to form a closer overall structural unit.