膨胀砂岩的抗剪强度与含水量的关系

Relationship between the shear strength and water content of swelling sandstones

针对南京红山窑水利枢纽工程中的红砂岩圆柱体试样,采用RMT-150B多功能刚性岩石伺服试验机,通过常规直接剪切试验的方法对不同含水量状态下的红砂岩圆柱体试样进行室内试验研究。通过对试验结果的线性回归分析得到膨胀岩的凝聚力c和内摩擦角φ与含水量w之间良好的对数关系,lgc和lgφ与含水量w之间呈线性相关,结合摩尔-库仑准则可以分析某些特定地区膨胀岩的抗剪强度与含水量的关系,这对工程设计、工程安全监测都具有非常重要的实际意义,可以为实际工程提供参考。

Laboratory shear test study is conducted on making use of a RMT - 150B muhifunctional rigidity Nanjing Hongshanyao hydro-junction project. Through cylinder specimens of red sandstone of different water contents by rock servo testing machine. The specimens are provided by the linear regression analysis of the test results, it is found that there exist logarithmic relationships between cohesion c, internal friction angle ψ and water content ω （ linear between lgc, lgtψ and water content ω ）. By applying the Mohr-Coulomb criterion, the relationship between shear strength and water content can be analyzed.