【摘要】 层理构造影响工程岩体力学性质及其稳定性.为了探究层理对板岩力学性质的影响及其破坏过程,制备了0°、45°与90°三种典型层理板岩试样,开展了不同层理板岩破坏过程的声发射单轴压缩岩石力学试验,揭示了不同层理板岩破坏过程中的岩体破裂机制和声发射数量与能量释放演化规律.研究结果表明:0°和45°层理板岩为劈裂与剪切混合破坏,破坏孕育过程中先产生剪切破裂,再产生张拉破裂,在初始受压阶段会出现大量声发射振铃计数,约占总计数的50%,而声发射能量释放分别呈现阶段性和瞬时性特征;90°层理板岩的破坏主要为贯穿岩样的劈裂破坏,破坏孕育过程中几乎均为张拉破裂,声发射振铃计数主要出现在岩样临近破坏前夕,声发射能量释放呈现瞬时性特征.三种典型层理板岩破坏前夕都出现声发射振铃计数突增和累计声发射能量高位释放且相近的现象.因此,振铃计数突增及累积声发射能量释放到一定量值的现象,可作为典型板岩破坏预测的前兆.更多还原

【Abstract】 Bedding structure affects the engineering rockmass mechanics properties and its stability. In order to explore the influence of bedding on mechanical properties of slate and its failure process, three typical slate samples with 0°, 45° and 90° bedding structures were prepared. The rock mechanics tests of acoustic emission uniaxial compression for different fracture processes of bedding slate were carried out to reveal the law of rockmass fracture mechanism, sound emission quantity and energy release in the process of different bedding slate failure. The results show that: the 0° and 45° bedding slates are with a mixture of tensile and shear failure. During the process of failure incubation, shear fracture is first occurred and then tensile fracture is followed. In the initial compression stage, a large number of acoustic emission ringing counts occur, accounting for about 50% of the total number, and the characteristics of AE energy release show "stage" and instant separately. The failure of 90°bedding slate is mainly the splitting failure which runs through the rock sample, and almost all of them are tensile fractures during the failure process. The acoustic emission ringing count mainly occurs on the eve of the rock sample’s total failure, and the acoustic emission energy release presents a transient feature. On the eve of the failure of three kinds of typical bedding slate, the phenomenon of sudden increasing of acoustic emission ringing count and high releasing of accumulated acoustic emission energy appeared. Therefore, the phenomenon of sudden increasing of ringing count and high level releasing of accumulated acoustic emission energy can be taken as the precursor of typical slate failure for prediction.更多还原