Research On Characteristics Of Infrasonic Sound During Rock Failure

Zhejiang is a province with frequent geological disasters.The frequent occurrence of landslide geological disasters has caused great harm to the province's economic construction and the safety of people's lives and property.Therefore,the monitoring and early warning of landslide disasters are extremely important.The development of new landslide disaster monitoring and early warning technology is a necessary issue in the field of geological disaster prevention.Select typical rock samples in Zhejiang area,carry out indoor tests under various loading conditions such as uniaxial compression of rock,rock bridge shearing and structural plane shearing of rock surface,and collect the infrasound signals generated by rock fracture under different loading conditions,processing and analysis,and also study the characteristics of infrasound signals generated when different types of rocks in Zhejiang area are damaged in different ways,and based on this,the key technologies of infrasound monitoring and early warning for rock landslide disasters in Zhejiang area were proposed.The main conclusions are as follows:(1)Rocks of different lithology have multiple infrasonic waves greater than the peak of the background signal during uniaxial compression,rock bridge shearing and structural plane shearing.The uniaxial compressive strength and loading duration of the rock are mainly different from the rock.The nature is related to the completeness of the rock sample.Limestone,tuff,sandstone and basalt all show that the amplitude of infrasound waves gradually reaches the maximum when the vertical stress is close to the peak,and the main frequency range of the generated infrasound signals is mainly concentrated in 1 ? 8Hz.There is no obvious correlation between the frequency characteristics of infrasound signals and lithology and loading methods.(2)During the process of uniaxial compression,rock bridge shearing and structural plane shearing,rocks with different lithology show that the cumulative ring count gradually increases,and before the stress reaches the peak value,the cumulative ring number increases significantly.There is no obvious correlation between the characteristics of cumulative ring count and lithology and loading methods.(3)Based on the infrasound characteristics of four typical rocks under different rock mass failure conditions such as uniaxial compression,rock bridge shearing and structural plane shearing,it is proposed that the rock landslide disaster monitoring and early warning system in Zhejiang should meet the overall design goals,including(1)Infrasound characteristic frequency range of 1Hz ? 8Hz;(2)Infrasound sensor having high sensitivity;(3)Hardware system needing to be equipped with band-pass filtering function;(4)Real-time visual display and monitoring data can be viewed;jobs.At the same time,the overall architecture design of the infrasound monitoring and warning hardware system and software system for rock landslides should be completed.The hardware system is mainly composed of sonic sensors,infrasound data acquisition module,GPRS communication module,alarm module and computer remote monitoring system,while the software system is mainly composed of a data processing unit and a data storage unit,so as to realize the analysis and processing of the collected signals and the storage and backup of the original monitoring data.The research results will provide strong technical support for the prevention and control of lithological landslide disasters in Zhejiang Province,and will also improve the level of early warning and prediction of landslide disasters in the region.