Road Performance Analysis of Different Solidified Silt Base Based on DCP
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摘要: 为分析沥青乳液、沥青微粉、无机复合型三种不同固化粉土基层的路用性能，依托黄河冲积平原农村公路项目进行不同结构层的现场动力锥贯入仪（DCP）试验，同时与8%水泥固化粉土基层对比分析。结果表明：沥青乳液、沥青微粉、无机复合型固化粉土基层的贯入度Dd为1.33～1.74 mm/blow，均小于水泥固化粉土结构层的贯入度2.09 mm/blow，其整体固化效果更优。三种不同固化粉土的DCP换算无侧限抗压强度与取芯实测无侧限抗压强度、DCP累积平均贯入度与FWD弯沉之间具有良好的相关性，采用分层计算与累积计算可分别用于单层强度和整体承载能力的快速评价。DCP测试结果还可为黄河冲积平原粉土改良固化路用性能的评价提供数据参考与工程借鉴。Abstract: In order to analyze the road performance of asphalt emulsion, asphalt powder and inorganic compound type solidified silt base course, field dynamic cone penetrometer (DCP) tests of different structural layers were conducted based on the Yellow River alluvial plain rural highway project, and compared with 8% cement solidified silt base simultaneously. The results show that the penetration of asphalt emulsion, asphalt powder and inorganic composite solidified silt base is between 1.33 mm/blow and 1.74 mm/blow, less than 2.09 mm/blow of the penetration of cement stabilized silt structural layer, and the overall curing effect is better. There is a good correlation between DCP converted unconfined compressive strength and measured unconfined compressive strength of coring, DCP cumulative average penetration and FWD deflection of the three different solidified silts, layered calculation and cumulative calculation can be used for rapid evaluation of single-layer strength and overall bearing capacity respectively. The DCP test results can also provide data reference and engineering reference for the evaluation of improved and solidified road performance of silt in the alluvial plain of the Yellow River.
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Key words:
- road engineering /
- silt /
- curing materials /
- DCP test /
- road performance
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表 1 粉土样品基本物理性质
比重 液限wL/% 塑限wP/% 黏粒含量/% 粉粒含量/% 砂粒含量/% 最大干密度ρd/(g·cm−3) 最佳含水率/% 2.71 29.7 23.0 6.9 69.1 24.0 1.77 18.9 
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表 2 水泥样品试验结果
密度/(g·cm−3) 比表面积/(m2·kg−1) 标准稠度/% 初凝时间/min 终凝时间/min 抗折强度/MPa 抗压强度/MPa 3 d 28 d 3 d 28 d 3.08 350 28.2 184 255 6.7 9.5 34.3 55.8
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表 3 不同固化粉土路段的贯入度汇总
测试层位 贯入度Dd/（mm/blow) 沥青乳
液固化段沥青微
粉固化段无机复合型
固化段常规水泥
固化段15 cm固化粉土基层
（0～15 cm）1.74 1.33 1.51 2.09 20 cm水泥稳定粉土基层
（15～35 cm）2.16 2.13 2.14 2.07 20 cm粉土地基
（35～55 cm）2.86 2.89 2.96 2.87
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