Mechanical response of roof rock mass unloading during continuous mining process in underground mine  

地下连续采矿过程中顶板岩体卸荷的力学响应(英文)

作　　者：胡建华[1] 雷涛[1] 周科平[1] 罗先伟[1] 杨念哥[1] 

机构地区：[1]中南大学湖南省深部金属矿开发与灾害控制重点实验室资源与安全工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第12期2727-2733,共7页中国有色金属学报（英文版）

基　　金：Projects (50934006, 51074178) supported by the National Natural Science Foundation of China;Project (2010QZZD001) supported by the Fundamental Research Funds for the Central Universities of China

摘　　要：Taking the test stopes during continuous mining induced roof caving of Tongkeng ore-body No.92 as example, the calculation flow of unloading analysis was established. According to the unloading region division method of the affected zone theory, and the deterioration laws of mechanics parameters of unloading rock mass, the continuous mining process in underground mine was analyzed by the software MIDAS/GTS, the mechanical response of roof rock mass unloading was studied, and the differences were analyzed with the conventional simulation. The result shows that the maximum tensile stress, subsidence displacement and equivalent plastic strain of roof rock mass are 1.5 MPa, 20 cm and 1.5% in the unloading analysis, while 1.0 MPa, 13 cm and 0.9% in the conventional analysis. The values of unloading analysis, which are also closer to the actual situation, are greater than those of conventional analysis; the maximum step in continuous mining is 48 m, which shows that the induced treatment of the roof should be carried out after 2 mining steps以铜坑矿92#矿体连续采矿顶板诱导崩落采场为研究对象,建立模拟的卸荷计算流程。依据影响区域理论的卸荷带划分方法,基于开挖卸荷过程中岩体力学参数变化规律,利用有限元软件MIDAS/GTS对地下连续采矿过程进行卸荷分析,并与常规分析进行对比。结果表明:卸荷分析的顶板最大拉应力、下沉位移以及等效塑性应变分别达到1.5MPa、20cm和1.5%;常规分析的顶板最大拉应力、下沉位移以及等效塑性应变分别为1.0MPa,13cm和0.9%;卸荷分析值均比常规分析值大,更接近实际情况;连续采矿开采的最大步距为48m,在开采两步距以后,应当对顶板进行诱导处理。

关 键 词：continuous mining mining-unload rock mass mechanics mining-unload disturbance region dynamic mechanical parameters 

分 类 号：TD327.2[矿业工程—矿井建设]