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自然界中的岩体含有大量的原生裂纹,这些裂纹在外载作用下扩展和相互贯通最终导致岩体失稳破坏。由于真实岩石为不透明材料,观察研究其原生裂纹的扩展演化机制十分困难。最新研制了一种新型材料;该材料透明度高,且具有很好的脆性和单轴压缩剪涨性,可以作为模拟岩石的相似材料,在该材料内部及表面预制裂纹,观察分析预制裂纹不同赋存方式对材料破坏机制的影响。试验中清晰观察到次生裂纹萌生扩展各个阶段的形状及预制裂纹不同的赋存方式对材料破坏模式的影响,以及表面预制裂纹赋存深度与试件强度和次生裂纹裂最终扩展宽度的关系。试验所得的成果对于研究真实岩体的破坏机制具有重要的参考价值。
In nature, the rock mass contains a large number of primary cracks, which expand and interpenetrate under the external load and eventually lead to the failure of the rock mass. Due to the fact that the real rock is an opaque material, it is very difficult to observe the expansion and evolution mechanism of its primary cracks. Recently, a new type of material has been developed. The material has high transparency and good brittleness and uniaxial compressive shearing property. It can be used as a similar material for simulating rock and prefabricated cracks in the material and the surface. Observation and analysis of different prefabricated cracks Influence of Deposit Methods on Material Failure Mechanism. The effects of different shapes of secondary crack initiation and propagation and different modes of occurrence of prefabricated cracks on material failure mode were clearly observed in the experiment. The relationship between the depth of surface pre-crack propagation and the ultimate tensile strength of secondary crack . The results obtained from the experiment have important reference value for studying the failure mechanism of real rock mass.