网栅土工砌块残余强度试验研究

Experimental Research on Residual Strength of Grid Geotechnical Masonry

为研究网栅土工砌块的强度特性,对其进行了室内大型单级剪切试验,得到了不同干密度下剪应力-剪切位移关系曲线及强度变化曲线,并采用摩尔库伦强度理论得到其峰值强度与残余强度的拟合强度指标。试验结果表明:网栅土工砌块的峰值强度及残余强度,随着干密度及法向应力水平的提高而提高;残余强度为峰值强度的80%～90%;摩尔库伦强度理论能很好的解释峰值强度与残余强度的作用机制。

The research is based on grid geotechnical masonry laboratory single-stage shear test, obtained shear stress-shear displacement relationship curve and intensity variation curve under different dry density situation, Mohr-Coulomb strength theory has been used to fit the peak strength and residual strength index. The results showed that： the peak strength and residual strength of grid geotechnical ma- sonry increased following the dry density and normal stress level increases; residual strength is in the range of 80% to 90% of the peak strength; Mohr-Coulomb strength theory can be used for well explai- ning action mechanism of peak strength and residual strength.