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为降低工程成本,京沪高铁建设中就地取用了石英二长岩全风化物作为路基填筑。通过全风化石英二长岩的无侧限动三轴试验,采集分析了该类土样的应力应变及加载次数关系,计算并探讨回弹模量随加载次数的变化规律,以及含水率与破坏应变等临界参数的关系。结果表明该填料主要工程特性为:含水率越大,临界参数性能越差,破坏趋势出现的越早。在工程实践中通过严格控制填料含水率和物理改良,取得了良好的工程效果和经济效益。
In order to reduce the project cost, the quartz monzogranite weathering material was used locally as the subgrade filling in the construction of the Beijing-Shanghai high-speed railway. Based on the unconfined triaxial test of fully weathered quartz monzogranite, the relationship between stress and strain and the number of loadings of this type of soil samples were collected and analyzed. The variation rules of the moduli of rebound modulus with loading times and the relationship between moisture content and damage Strain and other critical parameters of the relationship. The results show that the main engineering properties of the filler are as follows: the larger the water content, the worse the critical parameters, the earlier the failure trend appears. In engineering practice through strict control of filler moisture content and physical improvement, and achieved good engineering results and economic benefits.