ABSTRACT:

The instability of open pit slope is one of the main engineering disasters in mining. Especially in recent years, landslide disasters happened frequently on the high-steep slope that emerged from the deep mining of open pit mine due to the high pressure, which greatly influences the normal production and threatens the safety of workers. Aimed at the frequently happened phenomena of slope rock mass deformation and failure in Nanfen Open-pit Iron Mine, the artificial mechanical excavation test is carried out on the bottom bench of the high and steep slope with a height of 700 m, and the in situ real-time monitoring of deep mechanics is proceeded with the remote monitoring and warning system of sliding force, so as to intensively study the law of cracking deformation and failure of slope rock mass under the condition of high pressure. The test results show that under the influence of high pressure environment and ground excavation disturbance, local shallow pull-type failure mostly occurs at the bedding rock slope, and the sliding deformation area runs through the whole slope surface with a vertical height of about 12m. During the failure process, while the cracks generate, expand, run through the slope and the slope or become instability, the monitoring curve of sliding force can issue warning messages in advance, which can effectively avoid serious security accidents caused by landslide and crack disasters and has great theoretical and practical significance for prevention and control of mine landslide disasters.

1 INTRODUCTION

Rock landslide is a kind of landslide composed of various intact rock after the Tertiary. Bedding rock landslide is the most common in rock landslide, the volume of landslide is large, and the hazard is comparatively serious (Wang et al. 2004, Zhou et al. 2006).

In recent years, the vertical height of the open-pit slope is increasing with shifting the mining method of open-pit from hillside mining to hollow mining. The deformation and failure mode of the slope is closely related to regional geological structure features and rock structural characteristics, and its stability is severely affected by rock lithology, joint fissure and blasting vibration (Qiao & Li 2004). Especially the blasting vibration of open-pit production and rainfall are important factors for the stability of mine slope. The harm from production blasting vibration is an indirect damage, especially for jointed slope and high steep rock slope containing faults or fracture zone sand it is mainly caused by seismic waves generated in the blasting (Li et al. 2006).

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