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针对河北省境内张家口、承德地区的山前冲洪积扇的粉质粘土路基在长期运营过程中由于裂缝而引起路基进水的现象,结合宣大公路养护大修工程,主要研究不同含水率条件下路基土强度及模量的变化情况,得出路基土粘聚力和内摩擦角及弹性模量随着含水量增加的变化趋势.结果表明:土的粘聚力和内摩擦角随着含水量的逐渐增加而逐渐变小并趋于稳定,剪切模量随着含水率的增加逐渐减低.同时,利用里正岩土软件,分析路基边坡稳定性在含水量增加的情况下的变化趋势,提出路基边坡在含水率增加的情况下的预防或处理办法,对指导张家口、承德地区路基的设计以及施工以及延长道路的使用寿命有重要的意义.
Aiming at the silty clay subgrade of alluvial fan in front of alluvial fans in Zhangjiakou and Chengde of Hebei Province, the phenomenon of subgrade infiltration caused by cracks during long-term operation, combined with the maintenance and overhaul project of Xuan-Da Highway, The results show that the cohesion and internal friction angle of soil change with the change of water content of subgrade soil with the increase of water content While the shear modulus decreases gradually with the increase of water content.At the same time, by using the software of Rizhuang, the change tendency of stability of subgrade slope under the condition of increasing water content is analyzed , Proposed that the prevention and treatment measures of subgrade slope in the case of increasing water cut is of great significance in guiding the design and construction of subgrade in Zhangjiakou and Chengde as well as prolonging the service life of the road.