Bulging deformation mechanism of asphalt pavement in sulfate saline soil areas of Xinjiang
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摘要: 依托新疆阿克苏地区的两条公路,在进行公路路面鼓胀病害调查的基础上,选择4个典型病害部位开挖试坑,观察了路面结构层中损坏的情况,同时取样测试了基层及路基填料的含盐量、矿物成分、pH值等,分析了两条公路路面鼓胀病害的产生机理。研究结果表明：公路A（省道）路面基层中的离子以
SO2−4 、Ca2+ 为主,因此发生了钙矾石型硫酸盐侵蚀。公路B（国道）路面基层中Ca2+ 含量较高,同时含有一定量SO2−4 和CO2−3 ,因此发生了硅灰石膏型硫酸盐侵蚀。此外,夏季高温条件、水泥中碱含量超标等都加剧了两种硫酸盐侵蚀的发生。最后,根据两条公路病害产生机理,提出了硫酸盐渍土地区路面鼓胀病害的预防措施。Abstract: Based on two highways in Aksu prefecture of Xinjiang, four typical diseased sections are selected to excavate test pits on the basis of investigating bulging diseases of highways, the damage of structure layer pavement is observed, the salt content, mineral composition and pH value of base and subgrade fill are sampled and tested, and the mechanism of pavement diseases of the two highways is analyzed. The results show that the ions in the base course of Highway A (Provincial Highway) are mainlySO2−4 andCa2+ , so a chemical reaction takes place and Ettringite is formed. The content ofCa2+ in the base course of Highway B (National Highway) is high, and it also contains a certain amount ofSO2−4 andCO2−3 , so a chemical reaction takes place and Wollastonite gypsum is formed. In addition, the high temperature in summer and the alkali content in cement exceed the standard, accelerate the occurrence of two kinds of sulfate erosion. Finally, according to the mechanism of the two highway diseases, the preventive measures for bulging diseases of highways in the sulfate saline soil areas are put forward.-
Keywords:
- sulphate saline soil /
- asphalt pavement /
- semi-rigid base /
- bulging deformation /
- sulfate attack
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图 2 公路A（省道）K20+150断面
Figure 2. Cross-section in K20+150 of Highway A (Provincial Highway)
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图 3 公路A（省道）K17+330断面开裂部位路肩开挖取样
Figure 3. Cross-section in K17+330 of Highway A (Provincial Highway)
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图 6 公路A取样位置示意图
（图中□表示取样完成了含盐量、XRD、pH值测试；△表示取样完成了含盐量测试）
Figure 6. Schematic diagram of sampling location of Highway A
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图 7 公路B取样位置示意图
（图中□表示取样完成了含盐量、XRD、pH值测试；△表示取样完成了含盐量测试）
Figure 7. Schematic diagram of sampling location of Highway B
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图 10 公路A（省道）试坑中盐分离子种类及含量
Figure 10. Types and contents of salt separators in Highway A (Provincial Highway) test pit
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图 11 公路B（国道）试坑中盐分离子种类及含量
Figure 11. Types and contents of salt separators in test pit of Highway B (National Highway)
表 1 公路A病害部位含盐量测试结果
Table 1 Test results of salt content in diseased parts of Highway A
取样位置 试样编号 Cl− /SO2−4 含盐量/% 盐渍土名称 K20+150 1 0.018 1.002 硫酸盐中盐渍土 2 0.038 0.677 硫酸盐中盐渍土 3 0.048 0.709 硫酸盐中盐渍土 4 0.103 0.383 硫酸盐中盐渍土 Y1 0.090 0.428 硫酸盐中盐渍土 Y2 0.035 0.355 硫酸盐中盐渍土 Y3 0.061 0.588 硫酸盐中盐渍土 K17+330 5 0.201 1.705 硫酸盐中盐渍土 Y4 0.101 2.041 硫酸盐强盐渍土 Y5 0.067 0.717 硫酸盐中盐渍土 Y6 0.068 1.447 硫酸盐中盐渍土 
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表 2 公路B病害部位含盐量测试结果
Table 2 Test results of salt content in diseased parts of Highway B
取样位置 试样编号 Cl− /SO2−4 含盐量/% 盐渍土名称 K45+500 6 0.670 1.614 亚硫酸盐中盐渍土 7 0.407 1.533 亚硫酸盐中盐渍土 8 0.111 0.570 硫酸盐中盐渍土 Y7 0.416 2.827 亚硫酸盐强盐渍土 Y8 0.444 2.635 亚硫酸盐强盐渍土 Y9 11.417 2.637 氯盐中盐渍土 Y10 0.095 0.568 硫酸盐中盐渍土 坡脚外原状土 0.181 7.838 硫酸盐过盐渍土 K36+210 10 0.262 1.352 硫酸盐中盐渍土 11 0.209 1.806 硫酸盐中盐渍土 13 0.518 0.135 亚硫酸盐非盐渍土 Y11 0.475 0.184 亚硫酸盐非盐渍土
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