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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 a kind of expansive rocks. It is often unable to meet the construction requirements when rock mass grading is conducted on gypsum rock tunnels by using the standard specifications in highway survey and design stage. In order to solve this problem, the uniaxial compressive strength tests of rock samples with different gypsum mineral contents under the condition of dry-wet cycle were carried out. The stress-strain curve of gypsum rock under the influence of wetting and drying cycles was obtained. By comparing the uniaxial compressive strength characteristics of saturated rock samples, the intensity characteristics of gypsum rock subjected to wetting and drying cycles are summarized. A quantitative method for rock classification of gypsum rock tunnels is proposed.