隧道模型试验中软弱围岩相似材料配合比试验研究

Experimental Study on the Mixture Ratio of Similar Materials in Soft Rocks in Tunnel Model Test

隧道模型试验中围岩相似材料的力学参数直接影响模型试验的准确性。选用无毒的重金石粉、砂、石膏、水和洗涤精作为围岩相似材料的原材料,通过不断调整混合材料的配合比,得到符合要求的隧道模型试验中软弱围岩相似材料。研究结果表明,随重金石粉比例增加,模型材料的重度逐渐增加,弹性模量和内摩擦角均呈现先增加后减少,黏聚力逐渐增加;水膏比对模型材料的重度和内摩擦角的影响不大,但随着水膏比的减小,黏聚力和弹性模量减小;洗涤精可以增加混合物的黏稠度,小幅度范围内调整模型材料的力学参数,保证混合物的重复使用。

The mechanical parameters of similar materials for rock masses directly affect the accuracy of tunnel model test.Non-toxic barite powder,sand,gypsum,water and detergent are selected as the raw materials of similar materials for rock masses.By constantly adjusting the mixture ratio of the mixed materials,the similar materials of weak rock masses for the tunnel model test are obtained.The results show that with the increase of the proportion of barite powder,the weight of the model material gradually increases,the elastic modulus and internal friction angle both increases first and then decreases,and the cohesive force gradually increases.The water-paste ratio has little influence on the weight and internal friction angle of the model material.As the water-paste ratio decreases,the cohesion and elastic modulus decrease.The detergent can increase the viscosity of the mixture,adjusting the mechanical parameters of the model material in a small range and ensuring the reuse of the mixture.