郭乔明,杨璐,赵华,等. 复合长石粉路基填料强度特性及工程应用研究[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2026030011.

GUO Q M, YANG L, ZHAO H, et al．Research on the strength characteristics and engineering application of composite feldspar powder subgrade[J]. Journal of Henan Polytechnic University( Natural Science)， doi: 10.16186/j.cnki.1673-9787.2026030011.

复合长石粉路基填料强度特性及工程应用研究(网络首发)

郭乔明1，杨璐1，赵华2，吴奇霖3，李春志2，齐华安3，关博文3

1.江西省交通投资集团有限责任公司,江西 南昌 330199；2.南昌大学 工程建设学院,江西 南昌 330031；3.长安大学 材料科学与工程学院,陕西 西安 710064

摘要: 目的:为解决含锂瓷土矿提锂后产生的副产品长石粉难以大规模消纳制约锂电行业发展以及沿线路基填料紧缺的问题，以昌傅至金鱼石段改扩建项目工程沿线广泛分布的江西红色低液限黏土和提锂过程中产生的长石粉为研究对象，制备了一种新型复合长石粉路基填料。方法：首先，对该新型路基填料完成初步配合比设计，并对各个配合比的试样进行击实试验，确定最佳含水率和最大干密度，随后进行CBR试验，分析了各配合比填料的强度特性。根据室内试验结果，针对昌金改扩建下浦互通连接线路段开展复合长石粉路基填料现场试验，确定合适的路基施工参数和施工工艺，并进行质量检测。结果：试验结果表明，长石粉能够提高红色低液限黏土的最大干密度，促进颗粒的紧密排列，但过量的长石粉颗粒可能导致级配恶化，破坏颗粒排列体系，从而降低最大干密度。当路基填料配合比为长石粉：红色低液限黏土=4：6时具有合理的颗粒结构，达到最佳致密状态，其CBR值最大，具有较高的强度。结合PCAS软件对路基表面进行分析，当复合长石粉路基现场路段拌和次数为4时，路基填料的均匀性最高，同时压实度检测结果达到设计要求，应用效果良好，满足一级公路路基填筑要求。结论：结合复合长石粉在试验路实际工程中的应用，提出复合长石粉路基填料分层摊铺、拌合以及碾压工艺，实现长石粉在路基工程中应用。

关键词：路基工程；锂渣；长石粉；路基填料；路基施工

doi: 10.16186/j.cnki.1673-9787.2026030011

基金项目：国家自然科学基金资助项目（52168062）；江西省交通运输厅重点工程科技项目（2023C0014）

收稿日期：2026-03-11

修回日期：2026-05-06

网络首发日期：2026-08-18

Research on the strength characteristics and engineering application of composite feldspar powder subgrade (Online)

GUO Qiaoming1, YANG Lu1, ZHAO Hua2, WU Qilin3, LI Chunzhi2, QI Huaan3, GUAN Bowen3

1.Jiangxi Provincial Communications Investment Group Co., Ltd., Nanchang 330199, Jiangxi,China；2.School of Infrastructure Engineering, Nanchang University, Nanchang University, Nanchang 330131, Jiangxi, China；3.School of Material Science and Engineering, Chang’an University, Xi’an 710064, Shaanxi,China

Abstract: Objectives In order to solve the problem that the by-product feldspar powder produced after lithium extraction from lithium-containing porcelain clay ore is difficult to be consumed on a large scale, which restricts the development of lithium battery industry and the shortage of roadbed fillers along the line, this article focuses on Jiangxi red low liquid limit clay widely distributed along the reconstruction and expansion project of Changfu-Jinyushi section and feldspar powder produced in the process of lithium extraction as the research object, and prepares a new type of composite feldspar powder roadbed filler. Methods Firstly, the preliminary mix ratio design of the new subgrade filler was completed, and the compaction test was carried out on the samples of each mix ratio to determine the optimal moisture content and maximum dry density. Then the CBR test was carried out to analyze the strength characteristics of each mix ratio filler. According to the indoor test results, the field test of composite feldspar powder roadbed filler was carried out for the reconstruction and expansion of Changjin Xiapu Interchange Connection Line Section, and the appropriate roadbed construction parameters and construction technology were determined, and the quality inspection was carried out. Results The results show that feldspar powder can increase the maximum dry density of red low liquid limit clay and promote the close arrangement of particles. However, excessive feldspar powder particles may lead to deterioration of gradation, destroy the particle arrangement system, and reduce the density. When the mixture ratio of roadbed filler is feldspar powder : red low liquid limit clay = 4 : 6, it has a reasonable particle structure, achieves the best dense state, and has the largest CBR value and high strength. Combined with PCAS software, the surface of subgrade is analyzed. When the mixing times of composite feldspar powder subgrade section is 4, the uniformity of subgrade filling is the highest, and the compaction degree test results meet the design requirements. The application effect is good and meets the requirements of first-class highway subgrade filling. Conclusion Combined with the application of composite feldspar powder in the actual project of the test road, the layered paving, mixing and rolling process of the composite feldspar powder roadbed filler is proposed to realize the application of feldspar powder in the roadbed project.

Key words: subgrade engineering; lithium slag; feldspar powder; subgrade fill material; subgrade construction