| 摘要: |
| 对改良磷石膏进行了击实试验、无侧限抗压强度试验和加州承载比试验.然后通过离心机模拟了不同压实度和填土高度的路基（某方案改良的磷石膏作为路基填料）的沉降情况，并通过室内压缩试验结合分层总和法计算路基顶面的最终沉降.最后得出满足路基强度要求的改良磷石膏最佳配合比为：半水石膏占风干磷石膏质量10%，液黏剂占风干磷石膏质量0.5%.85%、95%、100%压实度的填土高度不大于20 m的路堤可满足20 cm的沉降要求. |
| 关键词: 道路工程 改良磷石膏 室内土工试验 离心机试验 |
| DOI：10.3969/j.issn.1007-9629.2022.01.012 |
| 分类号:U414.1 |
| 基金项目:国家重点研发计划（2016YFB0303603-4）；国家自然科学基金资助项目（51878577） |
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| Road Performance of Modified Phosphogypsum |
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MENG Weizheng1,2, JIANG Guanlu1,2, YUAN Dezhao1,2, BAO Jingjing1,2
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1.School of Civil Engineering， Southwest Jiaotong University， Chengdu 610031，China;2.Key Laboratory of High-speed Railway Engineering， Ministry of Education， Chengdu 610031，China
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| Abstract: |
| Compaction test， unconfined compressive strength test and California bearing ratio test were conducted to modified phosphogypsum. The settlement of roadbed with different compaction degree and height （modified phosphogypsum system as roadbed filler） was simulated by geotechnical centrifuge. The final settlement of subgrade with different boundary conditions was obtained by compression test and layer-summation method. The optimum mix ratio after comprehensive consideration is semi-hydrated gypsum accounts for 10% of the mass of air-dried phosphogypsum， liquid adhesive accounts for 0.5%.The modified phosphogypsum satisfies strength requirement of roadbed. Embankment（20 m height and below）with a compaction degree of 85%、95% and 100% satisfies the post-construction settlement requirements of 20 cm. |
| Key words: road engineering modified phosphogypsum laboratory soil test centrifuge test |
