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首页> 外文会议>International Conference on Structural Integrity and Fracture, SIF 2002, Sep 25-27, 2002, Perth, Australia >Acoustic emission controlled triaxial rock fracture and friction tests
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Acoustic emission controlled triaxial rock fracture and friction tests

机译：声发射控制的三轴岩石破裂和摩擦试验

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摘要

Eight cylindrical rock samples of Blauenthal granite and two of Flechtingen sandstone with 50 mm in diameter and 100 mm length were stressed to failure in triaxial compression tests. A stress indenter at the top of the cores resulted in a localized shear fracture. Fault nucleation, propagation and post-failure fric-tional sliding were monitored by ten piezoceramic sensors. Natural acoustic emissions and ultrasonic pulses were used to locate and characterize the focal mechanism of grain scale cracking events. The emission rate registered at one sensor close to the rupture nucleus servocontrolled the axial load and as a result the velocity of fault propagation and sliding. The crack microstructure after deformation was investigated using optical microscopy. The fracture tip is surrounded by a process zone manifested in a distribution of in situ acoustic emission hypocenters and microcracks. The width of acoustic damage zone is smaller in the fine-grained (～ 0.18 mm) sediment compared to the coarser-grained (～ 1.3 mm) crystalline rock. For the same material, fast growing fractures produce a wider damage zone than slow ones. For a given material, fracture propagation is associated with progressive localization of acoustic events; width of the acoustic zone is smallest during fric-tional sliding. In the Flechtingen sandstone implosion sources interpreted as pore collapse and grain crushing events dominate both the fracture and friction regime.
机译：在三轴压缩试验中，对八块Blauenthal花岗岩圆柱状岩石样品和两块直径50毫米，长度100 mm的Flechtingen砂岩进行了应力破坏。岩心顶部的应力压头导致局部剪切断裂。十个压电陶瓷传感器监测了断裂成核，传播和断裂后的摩擦滑动。使用自然声发射和超声脉冲来定位和表征晶粒开裂事件的焦点机制。在靠近破裂核的一个传感器处记录的发射率通过伺服控制轴向载荷，从而控制故障传播和滑动的速度。使用光学显微镜研究变形后的裂纹微观结构。骨折尖端被一个过程区域围绕，该过程区域表现为原位声发射震源和微裂纹的分布。细粒（〜0.18mm）沉积物中的声波损害区宽度小于粗粒（〜1.3mm）晶体岩石。对于相同的材料，快速生长的裂缝比缓慢的裂缝产生更大的损伤区域。对于给定的材料，断裂扩展与声事件的逐步定位有关。摩擦滑动时，声区的宽度最小。在Flechtingen砂岩中，内爆源解释为孔隙塌陷，而颗粒破碎事件主导着断裂和摩擦状态。

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