Study On The Collaborative Mechanism Between Mining Dynamic Disaster & Regional Geostress Field And Its Response Characteristic

There is close co-relation between regional stress and dynamic disaster inducing by mining. It is important approach to indicate the mechanism of generation and induction of disaster and accomplish the early warning ahead via dynamically analyzing the process of time-spatial revolution of disaster’s dangerousness during the mining disturbance and obtaining variation law and response characteristic.In order to demonstrate the collaborative mechanism between the mining disturbance effect and regional stress in mine field, quantitative relationship is built between dynamic disaster and regional stress, intertidal period stress, mining disturbance effect. On the basis of geo-dynamic division, several questions are discussed such as the regional prediction and dynamic assessment of disaster’s dangerousness under the mining disturbance, the variation law of regional intertidal period stress and its triggering effect to different type and different scale mine earthquake, the structure of dynamic disaster body and the collaborative mechanism and quantitative relationship between the structure and surrounding regional stress environment.In the process of mining disturbance, the condition of inducing dynamic disaster varies from time to time. Therefore, the dangerousness of inducing disaster also changes. In order to quantitatively analyze the time-spatial revolution law of different disaster-causing factors of dynamic disaster in the mining process and its effect to induce disaster dangerousness, some concepts are put forward, on the basis of geo-dynamic division, including rock burst hazard, rock burst potential, etc. According to the experiment, stress-accessing indexes of the rock burst hazard are established, which is able to reflect the similar degree between rock failure and limiting failure intensity and accomplish regional prediction and dynamic assessment of dynamic disaster’dangerousness under the mining disturbance effect.The occurrence of mining dynamic disaster is not only closely related to triggering factors of geology and mining, but it also influenced by earth tide. In order to quantitatively analyze the correlation between earth tide effect and mine earthquake occurrence, analysis is conducted to illustrate then correlation between the daily tide change of local earth tide strain and the level of mine earthquakes and their types on the basis of micro-seismic observation at Huating mine field in Huating county, Gansu province. Results show that:As a kind of extra force, earth tide stress shows distinctly triggering effect on mine earthquake. Tidal stress shows different triggering force effect to different types of earthquakes:It is easily happen when maximum vertical value and minimum horizontal value of tidal stress occurs for mine earthquake controlling by gravity, and vice versa for mine earthquake controlling by tectonic stress.The generation of mining dynamic disaster and its occurrence is finished under the co-operation of disastrous rock body and stress field of surrounding area. In order to quantitatively analyze regional stress effect generating by mining disaster, theoretical relationship is established between regional tectonic condition, mining engineering feature and disastrous body, and build the drill strain observation system in Huating mine aiming at dynamic disaster monitoring which successfully observe the drill strain response of bigger-scale mine earthquake incident in mine and several natural earthquake recently. Research result demonstrate that:the generating and inducing process of larger-scale mine earthquakes involve larger layer size scale, which is much more than traditional mining involve; there is a distinct correlation between the hypocenter and the stress field in "relevant area"; there exists two model of "phase step" and "vibration" of drill strain vary with earthquake response in surrounding region of mine earthquake; the drill strain expresses different response patterns change with the different scale of mine earthquake and the distance between observation point and hypocenter, there is "chain" mechanism between the disastrous body and relevant region.Drill strain observation equipment is disturbed by environmental factors and solid tide, which makes slightly usual change in the regional stress field are discovered. In order to accurately extract relevant disastrous characteristics from data measured in the drill strain, signals and calculation method are put forward and built to analyze the different forms of abnormal strain of rock body in relevant region and estimate the generating statement of disaster through fractal dimension, statistical sub-cluster and strain rate, etc. Results show that reflective omen information of rock burst can be concluded as follow:the "up→down" change of box counting dimension of drill strain velocity-time curve; the active increasing change of multiple featured parameters of statistical sub-cluster; the change of "0 →positive→0→negative→0" of stress rate velocity.Exploratory study in this dissertation preliminarily verify the correlation between the mine earthquake and regional tectonic stress environment, and the possibility of exploring generating mechanism of mine earthquake through regional stress and strain effect of mining disturbance. It is likely to establish collaboratively quantified mechanism between mining dynamic disaster and regional stress field and realize quantitative prediction of disaster if obtaining the disaster resource size scale of mine earthquake and rock burst, "relevant regional size scale" generated, strain (stress) response and its relevant characteristic parameters.