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为研究滚刀贯入过程中不同强度岩石的破坏行为,采用泥岩、花岗岩、砂岩和水泥砂浆制作立方体试样,结合岩石贯入试验加载系统和声发射监测系统,进行无侧向约束条件和有侧向约束条件下TBM常截面盘形滚刀贯入试验,获得完整荷载–贯入度曲线和声发射参数信息,分析不同岩石试样的破坏过程、破坏类型和破坏模式。结果表明:(1)软岩试样荷载–贯入度曲线跌落现象不明显,呈现延性破坏特征,而硬岩试样荷载–贯入度曲线跌落现象显著,具有脆性断裂特征。(2)无侧向约束条件下试样破坏类型属于劈裂破坏模式,有侧向约束条件下试样破坏过程由中间劈裂裂纹和侧向裂纹共同控制。(3)声发射参数曲线和荷载–贯入度曲线之间具有良好的对应关系,可以反映贯入过程中岩石试样内部损伤劣化和宏观裂纹形成过程。(4)类岩石材料滚刀贯入试验在一定程度上有助于更好地理解岩石贯入破坏过程和破坏模式,但类岩石材料与自然岩石材料在强度和变形性质上并不能完全吻合,因此相似材料模拟试验的结果需要进一步的验证。
In order to study the failure behavior of rock with different strength during the hob penetration, cubic samples were made of mudstone, granite, sandstone and cement mortar. Combined with rock penetration test loading system and acoustic emission monitoring system, Under the lateral restraint condition, the TBM cross-section disc cutter penetration test was carried out to obtain the complete load-penetration curve and acoustic emission parameter information, and to analyze the failure process, failure types and failure modes of different rock specimens. The results show that: (1) The load-penetration curve of soft rock samples is not obvious and exhibits ductile failure characteristics, but the drop of load-penetration curve of hard rock samples is marked with brittle fracture characteristics. (2) The failure type of the specimen without lateral restraint belongs to the splitting failure mode, and the failure process of the specimen under the lateral restraint condition is jointly controlled by the middle splitting crack and the lateral crack. (3) There is a good correspondence between the acoustic emission parameter curve and the load-penetration curve, which can reflect the damage and macro-cracks formation process inside the rock specimen during the penetration process. (4) The rock penetration test of rock-like materials will help to better understand the rock-penetrating failure process and failure mode to a certain degree. However, the rock-like materials and natural rock materials can not completely match the strength and deformation properties, Therefore, the simulation results of similar materials require further verification.