拱形抗滑桩墙支护结构体系模型试验相似材料研制

根据模型试验相似比尺和桩土间应力协调要求,用机制砂、河砂、水泥、石粉等配置了40组（每组6个）低强度、低弹性模量的圆柱形微混凝土相似材料试件。测试结果表明：微混凝土具有和原型混凝土大致相同的应力应变阶段和破坏模式,可以模拟原型结构的力学行为和变形、破坏特征。砂率和石粉取代率不同时,微混凝土试件的轴压强度和弹性模量在较大范围内变化;砂率较合适时,同一配合比微混凝土6个试件的强度和弹性模量一致性较好。微混凝土可以满足不同比尺模型试验对相似材料力学性质稳定、力学参数可以在较大范围内调整的要求。

Development in Materials for Model Tests of Arch Anti-slide Pile Walls Supporting Structure System

Considering the similitude ratio of model test and the stress coordination between piles and soil, 40 groups（there are 6 specimens in a group）cylindrical model concrete specimens were made of mechine-made sand,river sand,cement,stone powder and etc.These specimens have low-strength and low-elastic modulus.The tests show that the model concrete has similar stress-strain curves and failure modes to the prototype.So the model concrete can be used to simulate the elastic and elasto-plastic deformation of the prototype.Uniaxial compressive strengths and elastic moduli of model concrete will change in a considerable range with different sand ratios and different stone power replacements.But the discreteness of uniaxial compressive strengths and elastic moduli of specimens with the same mixing proportion is small if the sand ratio is relative suitable.Model concrete which has stable mechanical parameters in a wide range of adjustment can meet the requirements of different scale model tests.