| 聚氨酯固化海砂的静力特性试验研究 |
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| 引用本文： | 高运昌,高盟,尹诗.聚氨酯固化海砂的静力特性试验研究[J].岩土力学,2019,40(Z1):231-236. |
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| 作者姓名： | 高运昌 高盟 尹诗 |
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| 作者单位： | 1. 山东科技大学 山东省土木工程防灾减灾重点实验室，山东 青岛 266590；2. 山东科技大学 土木工程与建筑学院，山东 青岛 266590 |
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| 基金项目： | 国家自然科学基金青年基金项目（No.51708189） |
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| 摘 要： | 聚氨酯是一种高聚物，可以通过填充孔隙、胶结土颗粒的作用达到提高强度和整体性的目的。采用聚氨酯对海砂进行固化处理，设计无侧限抗压强度试验和三轴剪切试验，分析不同胶凝时间和不同固化剂含量下固化海砂的强度特性和变形特性。试验结果表明，随着胶凝时间的增加，固化海砂的强度提高，在固化时间3 h时就可达到稳定强度的80%以上，并且在试验所采取的质量比范围内，质量比越高，固化效果越好；聚氨酯泡沫填充到孔隙中使颗粒之间的咬合力增大，增强了黏聚力；颗粒重排列的阻力增大，使得海砂抵抗变形的能力增加，峰值强度提高，静力特性发生明显变化。
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| 关 键 词： | 聚氨酯 海砂 三轴试验 无侧限抗压强度 |
| 收稿时间： | 2019-01-25 |
Experiments on static characteristics of sea sand solidified by polyurethane |
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| GAO Yun-chang,GAO Meng,YIN Shi.Experiments on static characteristics of sea sand solidified by polyurethane[J].Rock and Soil Mechanics,2019,40(Z1):231-236. |
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| Authors: | GAO Yun-chang GAO Meng YIN Shi |
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| Institution: | 1. Shandong Province Key Laboratory of Civil Engineering and Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao, Shandong 266590, China; 2. Institute of Civil Engineering and Architecture, Shandong University of Science and Technology,
Qingdao, Shandong 266590, China |
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| Abstract: | Polyurethane is a kind of polymer, which can be used to improve the strength and integrity of material by filling pore and cementing soil particles. This paper used polyurethane to solidify the sea sand. The unconfined compressive strength tests and triaxial shear tests were designed to analyze the strength and deformation characteristics of solidified sea sand under different gelation time and different contents of curing agent. The experimental results show that with the increase of cementing time, the strength of solidified sea sand increases. More than 80% of the stable strength can be achieved at the solidification time of 3 hours. Moreover, the higher the mass ratio, the better the solidification effect. The polyurethane foam is filled into the pores, which increases the bite force between particles and enhances cohesion. The resistance of particle rearrangement increases, making the ability of sea sand to resist deformation become stronger, increasing the peak strength and changing the static properties. |
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| Keywords: | polyurethane sea sand triaxial test unconfined compressive strength |
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