Rock slope deformation pre-warning method based on microearthquake apparent stress

Abstract

The invention provides a rock slope deformation pre-warning method based on microearthquake apparent stress. The method includes the steps of (1) installing and arranging an ESG microearthquake monitoring system in a monitoring area; (2) conducting blasting excavation construction on the monitoring area, wherein since blasting excavation construction can cause microearthquake events in the monitoring area, the monitoring area is monitored through the ESG microearthquake monitoring system; (3) during monitoring, when the occurrence frequency of a high apparent stress microearthquake event within 4 days in partial regions in the monitoring area is larger than or equal to 2, drawing a curve graph of average microearthquake apparent stress changing along with the time and a curve graph of accumulated microearthquake apparent volume changing along with the time separately; if an average microearthquake apparent stress curve in the curve graph sharp increases from a gentle state to a peak value and then sharp decreases and meanwhile an accumulated apparent volume curve changes from a gentle state to a constantly increasing state, giving a rock slope deformation pre-warning to the partialregions. The method can effectively improve the accuracy of the rock slope deformation pre-warning.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, in particular to a rock slope deformation early warning method based on microseismic apparent stress. Background technique [0002] After the rock mass is excited by the external disturbance stress, there will be a local elastic-plastic energy concentration phenomenon inside it. When the energy accumulates to a certain critical value, it will cause the generation and expansion of micro-cracks in the rock mass, and the generation and expansion of micro-cracks Accompanied by the release of elastic or stress waves and rapidly propagating in the surrounding rock mass, such elastic waves are called microseisms in geology. The microseismic monitoring technology collects elastic wave information by arranging sensors in the monitoring area, obtains the time, location and nature of rock mass microseismic occurrence through the inversion method, and evaluates the damage status and safety status of t...

AI Technical Summary

Problems solved by technology

However, for shallow rock masses with low geostress, especially rock slopes, due to the formation of large-area free surfaces, the mechanism of rock mass failure is complicated, and the initiation, development, expansion, and penetration of cracks will be affected by various factors. Impact

Under different construction intensities, the frequency of microseismic events in different parts of shallow rock mass, especially in rock slopes, is roughly the same. It is difficult for traditional early warning methods to make a correct assessment of the overall stability of rock slopes. , according to the theory of in-situ stress, the in-situ stress of shallow rock mass is lower than that of deep rock mass, and the phenomenon of micro-crack aggregation is not as obvious as that of deep rock mass. Misjudgments that are too few to draw attention to

Images