›› 2016, Vol. 37 ›› Issue (10): 3035-3040.doi: 10.16285/j.rsm.2016.10.039

• Testing Technology • Previous Articles    

Safety monitoring experiment of unstable rock based on natural vibration frequency

DU Yan1, 2, XIE Mo-wen1, JIANG Yu-jing3, LI Bo2, GAO Yang4, LIU Qiu-qiang5   

  1. 1. School of Civil Engineering, University of Science & Technology Beijing, Beijing 100083, China; 2. Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan; 3. State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, Shandong 266590, China; 4. Structural Heath Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; 5. China Institute of Geo-Environment Monitoring, Beijing 100081, China
  • Received:2014-11-08 Online:2016-10-11 Published:2018-06-09
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (41372370, 41572274), the China Postdoctoral Science Foundation (2016M591078) and the Fundamental Research Funds for the Central Universities (FRF-TP-16-014A1).

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Abstract: Reduction of sliding resistance of unstable rock mass after an earthquake and heavy rainfall, is one of the main causes of failures. The instability and failure of unstable rock masses depend on the condition of the surface structure. As cracks open and the cohesive force of the bonding surface decreases, rock blocks become unstable, and then collapse occurs. If the conventional displacement-based monitoring method is adopted, it is generally difficult to achieve the goal of monitoring and early warning. In contrast, natural vibration frequency can effectively demonstrate the changes in physical and mechanical parameters of rock, and thus the safety assessments of unstable rock can be easily made. Through model experiments, the internal cohesive force and friction force of rock under constant sliding force are analyzed based on the natural vibration frequency. The friction force is compared to the maximum static friction force, in order to check whether or not the rock is prone to failure. It is shown that the calculated friction force can be used to effectively represent the safety of rock and the rock fails when the natural vibration frequency is below 6 Hz. The increase of the frictional force is up to 80% of stabilizing force, so that the friction increases rather than decreases in some cases. By monitoring the natural frequency, a quantitative assessment of the rock damage is made, and the static friction force index is identified, providing a new way for safety monitoring and damage evaluation of rocks based on natural vibration frequency.

Key words: unstable rock, natural vibration frequency, laser Doppler vibrometer, safety monitoring, early warning

CLC Number: 

  • TU 458

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