论文部分内容阅读
以程潮铁矿西区为背景,分析崩落法开采引起的地表塌陷过程和特征,并结合现场监测数据,阐明顶板冒落导致地表塌陷的3个阶段,分析研究崩落开采采矿量与地表塌陷的定量关系。结果表明,程潮铁矿西区地表塌陷可分为初始冒落、渐进冒落和剪切冒落3个阶段,并且以渐进冒落为主。崩落法开采引起的岩体崩落能否到达地表导致塌陷,与开采深厚比和碎胀系数有关,当覆岩厚度与开采矿体的累计厚度之比小于临界值时,岩体移动会发展至地表,引起地表塌陷。
Based on the western part of Chengchao Iron Mine, the process and characteristics of surface subsidence caused by caving mining are analyzed. Based on the on-site monitoring data, three stages of roof subsidence caused by surface caving are clarified. The quantitative relationship between the amount of caving mining and surface subsidence is analyzed. The results show that the surface subsidence in the western part of Chengchao Iron Mine can be divided into three stages: initial caving, progressive caving and shear caving, and are dominated by progressive caving. Caving caused by caving mining can lead to the collapse of the ground surface, which is related to the ratio of deep expansion and coefficient of expansion. When the ratio of overburden thickness to accumulated thickness of ore body is less than the critical value, the movement of the rock mass will develop to the surface , Causing the surface subsidence.