干湿循环影响下石膏质岩的强度特性及围岩分级研究

Research on the Strength Characteristics and Surrounding Rock Classification of Gypsum Rock under the Influence of Drying and Wetting Cycles

石膏质岩是一种具有膨胀性的岩石,在公路勘察设计阶段运用标准规范对石膏质岩隧道进行围岩分级往往不能满足施工要求。为了解决这个问题,对石膏类矿物含量各异的岩样在干湿循环条件下进行了饱和单轴抗压强度试验,得到了石膏质岩在干湿循环影响下的应力应变全过程曲线。通过对比饱和岩样的单轴抗压强度特性,总结了石膏质岩受干湿循环影响的强度特征,并且提出了针对石膏质岩隧道围岩分级的定量方法。

Gypsum rock is expansive,hence the surrounding rock classification of gypsum rock tunnel by applying standard technical specification often cannot meet the requirements of construction in the survey and design stage of highway.In order to solve this problem,saturated uniaxial compressive strength test is conducted on samples which gypsum mineral contents vary under the condition of drying and wetting cycles.Through comparing the result of saturated rock＇s uniaxial compressive strength characteristics,the gypsum rock＇s strength characteristics under the influence of drying and wetting cycle are summarized,and the quantifying method for the surrounding rock classification of gypsum rock tunnel is put forward.