Abstract
Waste dump landslides caused by the excavation of the base of the waste dump slope were simulated, and the guided wave technique was applied for waste dump stability monitoring. The influence of inner diameter and wall thickness of waveguides on guided wave attenuation is analyzed. The variation characteristics of the ring down count (RDC) rate and the trend of b value during landslide are discussed, which provides a theoretical basis for the guided wave monitoring and early warning for the stability of waste dumps. The results show that: (1) The guided wave signal attenuation is related to the frequency and the wall thickness, while the inner diameter has little effect. In the range of 0∼170 kHz, the signal attenuation increases with the frequency. In the range of 170∼512 kHz, the higher the frequency and the thicker the wall, the greater the signal attenuation is. (2) Guided wave RDC rate and video monitoring can reflect the whole process of landslide. The RDC rate curves have three prominent data peaks, which implies three landslide accidents. The video monitoring can respond to the whole process of changes in the scene in real-time. The change of parameter curve is more intuitive than the field picture. (3) The b value fluctuates significantly during the instability of the waste dump. At the early stage of the waste dump landslide, low-amplitude guided wave events are the majority, and the b value is at a high level. When a landslide occurs, the high amplitude events caused by friction and collision between gravel and waveguide increase rapidly, and the b value drops to the minimum value rapidly. When the waste dump is readjusted to the equilibrium state, the b value shows an upward trend. There is an obvious turning point in the b value curve before waste dump failure, which can be used as the precursor of landslide.
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