相似材料力学性质影响因素试验研究

选取地下工程物理模型试验中常用的石膏作为胶结剂,石英砂作为骨料制成相似材料试件.将相似材料试件置于不同尺寸、温度、含水率及加载速度条件下进行单轴压缩试验,得到单轴抗压强度和弹性模量,分析不同因素对相似材料力学性质的影响规律.研究发现,相似材料力学性质受尺寸、含水率及加载速度影响大,受温度影响小,且相似材料力学性质受不同因素影响原因与岩石的影响原因相同.为避免这些因素的影响,大型相似材料模型铺设时要严格控制用水量、充分搅拌原料、合理控制密实度及养护已经铺设的材料,同时精确控制荷载施加速度.

Experimental study on the factors affecting mechanical properties of similar material

Gypsum and quartz sand are chose as cementing material and aggregate of similar mate-rial respectively,which are wildly used in physical model tests of underground engineering.Uni-axial compression tests are conducted on similar material on the conditions of different model si-zes,temperatures,moisture contents and loading rates to get uniaxial compressive strength and elasticity modulus,then the influence rules of different factors on mechanical properties of similar material are analyzed.The results show that mechanical properties of similar material are affected by model sizes,moisture contents and loading rates,but little is affected by temperatures.And the mechanical properties of similar material and rock are affected by different factors for the same reasons.Therefore,to avoid those influence,it is important to strictly control the usage of water,fully mix the raw materials,reasonably control the compactness,maintain the materials that have been paved,and precisely control the loading rate when paving the large-scale similar material models.