Rock and Soil Mechanics ›› 2018, Vol. 39 ›› Issue (12): 4385-4394.doi: 10.16285/j.rsm.2017.2597

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Meso research on mechanical properties and slab failure mechanism of pre-fractured rock mass under the condition of one side restriction loading

ZHOU Yu1, SUN Zheng1, WANG Li2, WANG Yu1, DING Yin-ping3   

  1. 1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing, Beijing 100083, China; 2. PowerChina Road Bridge Group Co., Ltd., Beijing 100048, China; 3. China Railway 16th Bureau Group Co., Ltd., Beijing 100018, Chin
  • Received:2018-01-01 Online:2018-12-11 Published:2018-12-31
  • Supported by:
    This work was supported by the National Science Foundation for Young Scholors of China (51504016) and the Fundamental Research Funds for the Central Universities (FRF-BD-17-007A).

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Abstract: The slab failure of rock mass is one of the common destruction phenomena in underground engineering. Based upon equivalent rock mass (ERM) technique, the fracture (parallel to the free surface) and rock block are represented by the smooth-joint model and bonded-particle model, respectively. The strength, crack distribution, crack initiation and evolution, and slab failure formation mechanism of fractured rock mass under one side restriction (OSR) compression are studied by comparing experimental results and numerical modelling. With the increase in the number of fracture, the OSR compressive strength of rock mass exhibits linear decreasing. Under OSR loading, five types of cracks generated in rock mass can be identified. The type-Ⅰ and type-Ⅱ (shear) cracks are caused by the loading end effect, while the type-Ⅲ, type-Ⅳ and type-Ⅴ cracks are caused by slab failure of rock mass. In the process of slab failure, type-Ⅴ cracks which causes rock mass spalling at the unconfined boundary first occurs. Then type-Ⅳ cracks result in the propagation of original fractures generate. Finally, the type-Ⅲ cracks generate, which indicates that the slab failure phenomenon is developing towards the interior of rock mass. In various specimens under OSR loading, the relationship between the acoustic emission (AE) quantities and crack magnitude approximates Gaussian function distribution.

Key words: fractured rockmass, slab failure, one side restriction loading, equivalent rock mass technique, PFC

CLC Number: 

  • TU 452
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