【摘要】 基于岩体结构面抗剪强度机制及相似材料的选择原则和要求,研制以高强水泥、硅粉、高效减水剂、标准砂、水等原料混合而成的模拟材料,并利用其制得的试样及结构面模型进行大量物理力学试验的对比分析,研究结果表明:相似材料的抗压强度与原岩结构面相近,调整不同混合材料的配合比,相似材料可以覆盖中低强度的岩石类型;利用相似材料及多尺度试样模具可制作与原岩结构面表面形态及起伏度近似一致的模拟结构面;利用模拟结构面代替原岩结构面进行直剪试验,模拟结构面表面的磨损程度、粗糙度系数衰减规律及破坏形式均与原岩结构面相似,且模拟结构面抗剪强度直剪试验结果与理论计算值相差不大;模拟材料具有物理力学性能稳定、制作方便、成本低廉的优点,可代替原岩结构面进行不同尺寸、可重复性的破坏性试验。更多还原

【Abstract】 Based on shear strength mechanism of rock joints and the selection principle and requirement of similar material,a new type of similar material with the mixture of high-strength cement,silica fume,superplasticizer,standard sand and water is developed.A large number of physico-mechanical tests are performed by using samples and rock joint models made from the new similar material.The results show that the compressive strength and elastic modulus of similar material are close to the mechanical feature of original rock;and similar material can cover low and medium-intensive rock types through adjusting the contents of different materials.The surface morphology and undulation of simulated structure surfaces made with similar material and multi-scale molds are consistent with original rock′s surface.According to direct shear test,surface wear degree,roughness coefficient attenuation law and failure mode of original rock structural plane and simulated structural plane agree well;and the difference between test results and theoretical values is small.The similar material with the advantage of steady physico-mechanical properties,production convenience and low cost can replace natural rock joints to do different dimensional and repeated destructive rock joint tests.更多还原