多空区层状矿体诱导冒落机理及拉底方案优选

基于诱导冒落法提出了多空区层状矿体的回采方案，使用3DEC软件对诱导冒落机理及规律进行了研究.同时设计了4种不同退采顺序的拉底方案，并对其冒落效果进行了模拟.结果表明，矿柱尺寸越小、周边空区数量越多，矿柱越容易因应力集中而产生裂纹，当其裂纹与矿体层理面贯通时矿体便会冒落；当把拉底工程布置在最易破坏的矿柱下方并以其为中心向四周不断扩大拉底面积时，能够使矿体在最短时间内发生持续、稳定的冒落，从而可实现多空区矿体的安全高效回采.

Induced Caving Mechanism of Multi-mined-out Areas Layered Orebody and Optimization of Undercut Schemes

A technical scheme of mining multi-mined-out areas layered orebody based on induced caving method(ICM) was proposed， and 3DEC software was used to study the mechanism and law of induced caving. Four different withdrawal sequences were designed and simulated by the 3DEC software. The results showed that the larger the number of mined-out areas around the pillar and the smaller the size of the pillar， the more easily the cracks form in the pillar due to stress concentration. Once the crack connected with the bedding plane， the falling of the orebody begins. If the undercutting project is arranged at the bottom of the most vulnerable pillar and the undercutting area is continuously expanded from the pillar to the surrounding area， the continuous caving of orebody can occur in the shortest time. In this way， the safe and efficient mining of multi-mined-out orebody can be realized.