Study On Rules Of Mining Damage Caused By Open-pit With Under-ground Mining

Some mines use the open pit and underground mining, along with the produce process ,it can bring a large of damage, including the instability of slope and subsidence of coalfield etc. The superimposition mechanism and mutual interference mechanism of two mining activities in the slope rock mass are very complicated under the influences of simultaneous open-pit and underground mining.when repeated coal-mining in vertical and horizontal, the situation become much worse. If there is lack of a science and reasonable assess to this problem, the whole product system will be affected seriously. so it is of vital significance to find a practical method to quantitatively evaluate this composite affection. Aim at this matter, the article studied following aspects of questions with emphasis:(1) Study on the geology circumstances and the kinds of hazards caused by coal mining(2) Used the sonic wave test method to assess the integrity of the rock body(3) Study the basic laws of failure when mining under slope(4) Study on the laws of surface subsidence(5) Laws of subsidence when repeated coal-miningThe paper summarized former achievements on the study of the Open-pit With Under-ground mining subsidence.through the exploration of the scene,the theoretical analysis and numerical method to considered the mining reality in Ping Shuo coalfield,studied the present situation of diggings,mining damage reality,evaluating mechanics property.of rock engineering,developing laws of the slope stability due to the under ground mining,laws of repeated coal-mining on the ground subsidence at the same time.It obtained several achievements as follows:(1) analyzing the kinds of hazards caused by coal mining, introducing the geology circumstances ,geology tectonic and hydrology condition of the mining areas, studying the hazards caused by coal mining by classifying. giving the suggest s of analyzing the stability of slope by different zones, finally make certain the whole stability(2)used the sonic wave test method to assess the integrity of the rock body, also sum up the Research Results on rock mechanical experiment by some college and ??research institute(3)Sum up the Deformation and mechanics theory of overburden rock; also introduce the subsidence forecast method ,using type curve method to forecast the surface subsidence, To evaluate the different subsidence curve of slope and flat surface(4)On consider of present subsidence situation caused by coal mining, utilizing numerical imitation method, giving the model and regulation of the imitation calculation.(5)Analysis to the Theory combined with numerical imitation method, studied thebasic laws of failure when mining under slope(6)Studied the basic laws of deformation and mechanics when repeated coal-mining in vertical and horizontalThe result indicated: the slope stability is different when underground mining zones situated varies location; It is different for subsidence curve of slope and flat surface; Repeated coal-mining could prick up the surface subsidence...