磷石膏复配早强剂改良滨海地区软土路基 水泥土搅拌桩的试验研究
An experimental study on cement-soil mixing piles improved by phosphogypsum compound early-strength agent in coastal soft soil subgrade
关键词：
水泥土搅拌桩；磷石膏；早强剂；无侧限抗压强度；渗透系数
Key words：
Cement-soil mixing pile; Phosphogypsum; Early-strength agent; Unconfined compressive strength; Permeability coefficient
刊期：
2026年第9期
DOI：
10.19761/j.1000-4637.25020097
文章编号：
基金项目：
教育部产学合作协同育人项目（231000641165259、231102168094524）；企业委托横向课题项目（2025xhx097）。
作者：
项 许1，牛智勇2，栾从起2，*，王建望3
单位：
1.中铁一局集团（广州）建设工程有限公司，广东 广州 511400；2.宿州学院 资源与土木工程学院， 安徽 宿州 234000；3.延安大学 建筑工程学院，陕西 延安 716000
摘要
摘 要：针对广澳高速公路改扩建工程软土路基易产生不均匀沉降、渗透变形等问题，为优化水泥土搅拌桩加固效果、提升桩体强度与抗渗性能，同时实现工业固废资源化利用，本文采用磷石膏复配早强剂改性水泥土，通过正交试验研究磷石膏掺量、水泥掺量及早强剂掺量对固化水泥土力学性能与渗透性能的影响。结果表明：水泥掺量对7 d和28 d无侧限抗压强度的影响最大；磷石膏掺量对7 d和28 d渗透系数的影响最显著，水泥掺量和早强剂掺量对7 d和28 d渗透系数的影响不显著；综合考虑无侧限抗压强度和渗透系数，建议最优配合比组合为A3B3C2，即磷石膏、水泥、早强剂掺量分别为10%、25%、1.0%，此时试件的28 d无侧限抗压强度和渗透系数均满足该路基工程要求。研究成果可为磷石膏在类似软土地基加固工程中的应用提供参考。
Abstract: To address issues such as uneven settlement and seepage deformation in soft soil subgrades during the reconstruction and expansion project of the Guangzhou-Macao Expressway, and to optimize the reinforcement effect of cement-soil mixing piles, enhance their strength and impermeability, while simultaneously promoting the resource utilization of industrial solid waste, this study employs phosphogypsum compounded with an early-strength agent to modify the cement-soil. Orthogonal experiments were conducted to investigate the effects of phosphogypsum content, cement content, and early-strength agent content on the mechanical properties and permeability characteristics of the solidified cement-soil. The results indicate that cement content exerts the greatest influence on the 7-day and 28-day unconfined compressive strength. Phosphogypsum content shows the most significant effect on the 7-day and 28-day permeability coefficients, whereas the influences of cement content and early-strength agent content on these coefficients are not significant. Considering both unconfined compressive strength and permeability coefficient comprehensively, the optimal mix proportion is recommended as A3B3C2, namely 10% phosphogypsum, 25% cement, and 1.0% early strength agent. Under this formulation, both the 28-day unconfined compressive strength and the permeability coefficient meet the requirements of this subgrade project. The findings can provide a reference for the application of phosphogypsum in similar soft soil foundation reinforcement projects.
结论
（1）各因素对7 d、28 d无侧限抗压强度的影响程度大小顺序分别为B>C>A、B>A>C，其中，水泥掺量对无侧限抗压强度的影响最大。各因素对7 d和28 d渗透系数的影响程度大小顺序均为A＞B＞C，其中，磷石膏掺量的影响最显著，水泥掺量和早强剂掺量的影响不显著。
（2）综合考虑7 d和28 d无侧限抗压强度和渗透系数，建议最优配合比组合为A3B3C2，即磷石膏、水泥、早强剂掺量分别为10%、25%、1.0%，此时试件的28 d无侧限抗压强度为3.95 MPa，渗透系数为1.89×10-7 cm/s，满足该工程要求。基于现有室内试验成果，后续将开展现场工艺性试桩试验，验证该配合比下水泥土搅拌桩的施工均匀性、强度发展规律及长期防渗效果。
参考文献
[1] Li Shuanglong,Deng Zhiping,Wei Limin,et al.Lateral behavior of high-speed railway bridge pile foundation in soft soils under adjacent surcharge loads considering time-dependent characteristics[J].Alexandria Engineering Journal,2025,110:451-467.
[2] 周越洲,李重阳,李国清,等.软土地基倾斜桩竖向承载力研究[J].建筑结构学报,2022,43(8):274-281.
[3] 杨红霞.软土地基摩擦桩桩顶轴向荷载与沉降非线性模型研究[J].公路交通科技,2006(5):72-74.
[4] Liu Hongbo,Zhu Wenbo,Dai Guoliang,et al.Analytical approach for vertical dynamic responses of stiffened deep cement mixing pile in unsaturated ground[J].Soil Dynamics and Earthquake Engineering,2024,187:108969.
[5] Zhao Junnan,Zong Zhongling,Huang Yunhan,et al.Vertical and lateral bearing performance of bidirectional Helix-Stiffened cement mixing piles on marine soft soil sites: Field tests and numerical simulations[J].Ocean Engineering,2025,323:120678.
[6] 丁建文,万星,高洪梅,等.赤泥磷石膏与水泥协同固化淤泥的力学特性与微观机理[J].岩土工程学报,2026,48(3):509-518.
[7] 谢建海,雷航州,李明泽,等.磷石膏基胶凝材料的制备及其混凝土性能研究[J].混凝土与水泥制品,2025(8):6-9,20.
[8] 杨雪娇,钟晋,刘磊,等.磷石膏无害化处理技术及其在土壤调理中的应用研究进展[J].化工矿物与加工,2025,54(3):57-64.
[9] Shi Xiong,Zeng Ao,Huabo Duan,et al.Status and development trends of phosphogypsum utilization in China[J].Circular Economy,2024,3(4):100116.
[10] Dewindt M A,Weiksnar K D,Laux S J,et al.A review of the suitability and performance of phosphogypsum as a material for road base and subbase construction[J].Resources, Conservation and Recycling,2025,215:108120.
[11] 丁建文,张帅,洪振舜,等.水泥-磷石膏双掺固化处理高含水率疏浚淤泥试验研究[J].岩土力学,2010,32(9):2817-2822.
[12] Zhang Dingwen,Liu Ziming,Sun Xun,et al.Laboratory tests on enhancing strength of cement stabilized organic soil with addition of phosphor gypsum and calcium aluminate cement[J].Journal of Southeast University(English Edition),2017,33(3):301-308.
[13] Huang Kai,Cai Guojun,Yan Chao,et al.Strength and microstructure characteristics of red-bed weathered residual soil stabilized by titanium gypsum-cement[J].Construction and Building Materials,2023,403:133071.
[14] Pang Yingdi,Li Na,Fan Meixin,et al.Soil utilization of solid waste: Small-strain dynamic properties and microscopic mechanism of phosphogypsum-modified coastal cement soil[J].Journal of Materials Research and Technology,2024,33:4265-4279.
[15] 王涛,张赛,郝钢,等.磷石膏改良长江漫滩水泥搅拌桩试验研究[J].混凝土,2022(5):167-172.
[16] Luan Congqi,Wang Jinbang,Zhou Zonghui.Synergic effect of triethanolamine and C-S-H seeding on early hydration of the limestone calcined clay cement in UHPC[J].Construction and Building Materials,2023,400:132675.
[17] 邹璇,郝瑞甫,齐敦哲,等.早强剂对大掺量石灰石粉胶凝材料体系水化的影响研究[J].混凝土与水泥制品,2025(10):41-46.
引用本文
项许,牛智勇,栾从起,等.磷石膏复配早强剂改良滨海地区软土路基水泥土搅拌桩的试验研究[J].混凝土与水泥制品,2026,53(9):68-72. Xiang Xu,Niu Zhiyong,Luan Congqi,et al.An experimental study on cement-soil mixing piles improved by phosphogypsum compound early-strength agent in coastal soft soil subgrade[J].China Concrete and Cement Products,2026,53(9):68-72 (in Chinese).
下一个： 钢纤维布置方案对层布式钢纤维混凝土力学性能及韧性的影响
相关文件