摘要
为研究黄淮粉土的长期路用性能,开展了基本物理性质、标准CBR试验、平衡湿度和干湿循环条件下的CBR试验研究。研究表明:压实度为93.00%时,黄河粉土和淮河粉土的标准CBR值分别为7.42%,4.60%,平衡湿度下黄河粉土和淮河粉土的CBR值分别为13.39%,19.41%;随着干湿循环次数的增加,黄淮粉土CBR值都逐渐减小,基本符合指数函数规律,经过5次干湿循环,黄河粉土和淮河粉土的CBR分别衰减了27.00%,46.00%,且性能衰减仍无明显稳定迹象。因此,建议粉土路基设计时必须考虑长期路用性能,根据平衡湿度条件下CBR值和干湿循环条件下的CBR值综合确定利用范围,并采取隔水和包边措施,防止性能过度衰减。
In order to study the long-term road performance of Huanghuai silt,the basic physical properties,standard CBR test,CBR test under equilibrium moisture and drying and wetting cycles were carried out.The results show that the standard CBR values of Yellow River silt and Huaihe River silt are 7.42%,4.60%respectively when the compactness is 93.00%,and the CBR values of Yellow River silt and Huaihe River silt are 13.39%,19.41%respectively under equilibrium moisture;With the increase of the number of dry/wet cycles,the CBR value of Huanghuai silt gradually decreases,which basically conforms to the law of exponential function.After five dry and wet cycles,the CBR of Yellow River silt and Huaihe River silt are attenuated by 27.00%,46.00%respectively,and there is still no obvious stable sign of performance attenuation.Therefore,it is suggested that the long-term road performance must be considered in the design of silt subgrade,the utilization range shall be comprehensively determined according to the CBR value under the equilibrium moisture condition and the CBR value under the dry/wet cycle condition,and water insulation and edge wrapping measures must be taken to prevent excessive attenuation of performance.
作者
张晶
王云
付伟
刘星
ZHANG Jing;WANG Yun;FU Wei;LIU Xing(CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China)
出处
《路基工程》
2022年第1期62-65,共4页
Subgrade Engineering
基金
国家重点研发计划重点专项项目(2018YFC0809605)。
关键词
黄淮粉土
长期路用性能
平衡湿度
干湿循环
CBR
Huanghuai silt
long-term road performance
equilibrium moisture
drying and wetting cycle
CBR
