脆性岩体岩爆倾向性的相似材料配比试验研究

坚硬脆性岩体具有岩爆倾向性。选取单轴抗压强度? c、抗压抗拉强度比? c /? t与冲击能量指数WB为岩爆概化指标。在制作岩爆模型材料时，采用石英砂、石膏、水泥、水、甘油和明胶等相似材料成分运用正交试验设计的原理进行配比试验，制作模型小试件。对模型小试件进行单轴抗压强度试验和劈裂试验，找出了各相似材料成分配比对试件? c、? c /? t与WB的影响特征，选取了合适的岩爆模型材料的配方。该配方力学指标稳定，既满足物理模拟岩爆的模型材料的要求，又便于一次性浇注大尺寸模型试件，较适用于大型物理模拟试验。

Proportioning test study on similar material of rockburst tendency of brittle rockmass

Rigid and brittle rocks trend to rockburst，which is generalized by uniaxial compressive strength ? c, ratio of compressive strength and tensile strength ? c /? t and exponential of strike energy WB. Before physical model is made, some similar materials, such as quartz sand, gypsum, cement, water, glycerin and glutin, are blended by different proportions of ingredients according to the principle of orthogonal test design. In course of the proportioning, the small model samples are produced and uniaxial compressive test and split test are done with them. From the results of the tests, it is found that the different proportions of similar materials influence ? c , ? c /? t and WB differently. Based on physical simulation, ? c , ? c /? t and WB are checked in general and the directions for the material generalization are confirmed. The mechanical parameters of materials by the directions, which are steady, not only meet with requests for rockburst, but are convenient for making big model. Therefore, great physical simulation for rockburst is feasible.