1.深圳市综合交通与市政工程设计研究总院有限公司, 深圳 518000
2.河海大学岩土力学与堤坝工程教育部 重点实验室,江苏 南京 210098
3.河海大学苏州研究院,江苏 苏州 215100
王明(1989—),男,高级工程师。主要从事岩土工程方面的研究。E-mail: 874032846@qq.com
叶梓(1995—),男,副研究员,博士。主要从事岩土及地下工程方面的研究。E-mail: ziye_1995@163.com
收稿:2024-04-17,
修回:2024-06-18,
纸质出版:2025-08-28
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王明,刘振忠,薛泽等.流态固化土基本物理力学性能试验与应用研究[J].防灾减灾工程学报,2025,45(04):941-948.
WANG Ming,LIU Zhenzhong,XUE Ze,et al.Experiment and Application Study on Basic Physical⁃mechanical Properties of Soil⁃based Controlled Low⁃strength Materials[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(04):941-948.
王明,刘振忠,薛泽等.流态固化土基本物理力学性能试验与应用研究[J].防灾减灾工程学报,2025,45(04):941-948. DOI: 10.13409/j.cnki.jdpme.20240417005.
WANG Ming,LIU Zhenzhong,XUE Ze,et al.Experiment and Application Study on Basic Physical⁃mechanical Properties of Soil⁃based Controlled Low⁃strength Materials[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(04):941-948. DOI: 10.13409/j.cnki.jdpme.20240417005.
深基坑、管廊肥槽、桥涵台背等工程常需要进行回填作业,流态固化土由于其自密实、自流平、自硬化的优势,近年来得到广泛关注,具备替代传统碾压夯实回填材料的潜力。本文依托宁波西洪大桥某管廊回填工程,研究了不同固化剂配比下流态固化土的无侧限强度、渗透系数、压缩特性与流动特性,并且结合现场试验探讨了其工程应用的可行性。结果表明,添加减水剂组流态固化土的强度、渗透性等服役性能指标与施工和易性均显著提升。9%水泥掺量+1%膨胀剂+0.5%减水剂试样相较9%水泥掺量+1%膨胀剂试样的7 d无侧限抗压强度由0.79 MPa提升到1.36 MPa,上升了72%,渗透系数下降了20.6%,压缩模量提升了25.7%;该配比的拌合后含水率为64.6%,拥有180 mm的坍落度。减水剂能有效增加固化土中的水化产物总量,形成网状络合结构链接内部土颗粒,具备良好的支撑效应,提高胶凝材料的聚合度,保证其内部结构更为致密。现场试验发现,流态固化土7 d无侧限抗压强度达0.61 MPa,抗渗性能大幅提高,但较试验室数据性能损失近50%。
Backfill operations are often required for deep excavations
pipeline trenches
bridge abutments
and culverts. Soil-based controlled low-strength materials (CLSM)
with advantages of self-compaction
self-leveling
and self-hardening
have gained widespread attention in recent years and have the potential to replace traditional compacted backfill materials. This study
based on the backfilling project of the pipeline corridor at the Ningbo Xihong Bridge
investigated the effect of curing agent proportions on the unconfined compressive strength (UCS)
permeability
compressibility
and flowability of soil-based CLSM
and discussed the feasibility of its engineering application through field tests. The results showed that adding a polycarboxylate superplasticizer (PS) significantly enhanced the strength
permeability
and workability of soil-based CLSM. Specifically
the mixture with 9% cement
1% expansion agent
and 0.5% PS exhibited a 7-day UCS increase from 0.79 MPa to 1.36 MPa
a 72% improvement
a 20.6% reduction in permeability coefficient
and a 25.7% increase in compressive modulus compared to the mixture with 9% cement and 1% expansion agent. The post-mixing moisture content of this mixture was 64.6%
exhibiting a slump of 180 mm. The PS significantly increased the total amount of hydration products in the soil-based CLSM
forming a network-like structure that connected the internal soil particles. It had a strong supporting effect
increased the polymerization degree of the binder
and ensured a denser internal structure. Field tests revealed that the 7-day UCS of the soil-based CLSM reached 0.61 MPa
with significantly improved impermeability
but showed nearly a 50% reduction in performance compared to laboratory results.
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