不同胶结尺寸的粒间胶结强度统一表达式

Unified expression for bonding strength of cemented granules with different bond sizes

为研究胶结物的尺寸,即胶结宽度、胶结厚度,对粒间胶结物力学特性的综合影响,在分析已完成的不同胶结宽度和厚度微观胶结模型试验基础上,提出了考虑胶结尺寸的胶结强度统一表达式。结果表明:不同胶结尺寸试样的峰值压缩和峰值拉伸荷载均与端部约束因子?和高宽比例因子?相关;不同胶结尺寸试样的抗剪和抗扭能力可以使用统一的表达形式,即拟合剪切系数和抗转动系数来表征;在三维峰值荷载空间中,不同胶结尺寸下胶结试样荷载包线均呈开口空心椭球状,随着胶结宽度的增大,试样峰值荷载增大,且增大趋势明显;随着胶结厚度的增大,试样峰值荷载减小,而当胶结厚度达到一定程度后,减小趋势不明显。

To investigate the effects of bond sizes （including width and thickness） on the idealized inter-granular mechanical properties of cement, an unified strength expression of cement is proposed with considering the bond sizes, based on the previous research results and the results of experiments performed on inter-granular bonds with different sizes. The results reveal that, both the peak compression force and tension force are associated with the factor λ which is representable for the end constraint and the factor which refers to the ratio of height to width of samples. Shear and torsional capacity of cemented sample with different bond sizes can be expressed uniformly by the fitted shear coefficient and anti-rotation coefficient. In the three-dimensional peak force space, the strength envelopes of the cemented samples of different bond sizes show opening hollow oval balls. In addition, the values of the peak forces increase significantly as the bond width increases; the values of the peak forces decrease with the increase of bond thickness,and when the bond thickness approaches a certain extent, the trend of force decrease becomes insignificant.