基于原材料种类的3D打印岩体力学性能研究

Research on mechanical properties of rock mass based on 3D printing of raw materials

为探讨不同原材料对3D打印岩体试样物理力学性能的影响和作用机理,对不同原材料打印试样与实际岩体的异同进行了归纳分析。研究表明,类石膏粉末最为常用且最接近实际岩体性能,但其密度和抗压强度明显低于实际岩体;工程塑料的抗拉强度理想,但其密度过小,且弹性模量和峰值压应变与实际岩体差异较大;烧结物颗粒密度较大,但其抗拉强度、弹性模量和峰值压应变均与实际岩体存在较大差异;光敏树脂抗压强度和抗拉强度与部分岩体接近,但其密度、弹性模量和峰值压应变与实际岩体差异较大。

In order to explore the effects of different raw materials on the physical and mechanical properties of 3D printed rock samples and the mechanism of action,the similarities and differences between printed rock samples with different raw materials and actual rock samples were summarized and analyzed.The results show that the gypsum powder is the most commonly used and closest to the actual rock mass,but its bulk density and compressive strength are obviously lower than the actual rock mass.The tensile strength of engineering plastics is ideal,but the bulk density is too small,and the elastic modulus and peak compressive strain are different from the actual rock mass.The bulk density of sintered material is large,but its tensile strength,elastic modulus and peak compressive strain are different from the actual rock mass.The compressive strength and tensile strength of photosensitive resin are close to those of some rock masses,but the bulk density,elastic modulus and peak compressive strain of photosensitive resin are quite different from those of actual rock masses.