【摘要】 为了研究接触带复合岩体变形破坏特征,以水泥、砂和石膏为相似材料,制作由两种不同强度材料构成的复合试件,通过单轴压缩试验,分析相似材料强度比及较高强度材料体积占比对复合试件力学特性的影响。研究结果表明,(1)相似材料强度比越大对复合试件整体强度的影响越大,较高强度材料体积占比的变化对复合试件整体强度的影响较为显著;(2)相似材料强度比为1.74时破裂面从复合试件一端穿过相似材料接触面,相似材料强度比值为2.49时破裂面由接触面向复合试件两端延伸,相似材料强度比为4.33时复合试件逐渐由两端破坏转为较低强度材料端破坏;(3)声发射计数的变化与复合试件破坏位置与形态呈对应关系,随着相似材料强度比的增加,较高强度材料端声发射计数逐渐减小,较低强度材料端声发射计数逐渐增加。研究结果可为接触带复合岩体力学特性分析提供参考。更多还原

【Abstract】 In order to study the deformation and failure characteristics of contact zone composite rock mass, the cement, sand and gypsum are used as similar material to make specimens with two different strength materials. By uniaxial compression test, influence of similar material strength and high strength material volume ratio on the mechanical properties of composite specimens is analyzed. The results show that:(1) The larger the strength ratio of the similar material, the greater the impact on the overall strength of the composite specimens; the change of the volume ratio of the higher strength material has a significant impact on the overall strength of the composite specimens.(2) When the similar material strength ratio is 1.74, the rupture plane passes through composite specimen end to similar material contact surface; when it up to 2.49, the rupture plane extends from contact surface to both ends of the composite specimen; when it to 4.33, the composite specimens failure gradually changes from both ends into low strength material end.(3) There is a corresponding relationship between variation of acoustic emission(AE) counts and damage location and shape of composite specimens. With strength ratio of the similar material increasing, AE counts of high strength material end gradually decreased and low strength material end gradually increased. The study provides a theoretical reference for the strength analysis of contact zone composite rock mass.更多还原