岩体诱导冒落的数值模拟

Numerical Simulation on Induced Caving of Rock Mass

采用RFPA分析软件,针对不同回采深度、不同节理分布,并考虑彼此综合作用,模拟了采场顶板的冒落过程.结果表明,采场顶板冒落轨迹近似拱形抛物线,冒落高度大约为开挖推进跨度的40%~60%.通过对比分析,得到以下结论：侧压力越大,开挖步距越大,则冒落高度越小;深埋高应力岩体冒落区形状由抛物线渐变为层状;水平节理岩体的冒落形状由抛物线形渐变成马鞍形;竖向节理冒落呈尖塔形.研究对实现低成本高效率开采、消除地下安全隐患、科学诱导采空区冒落具有理论和工程价值.

Stope roof caving with stope depth and joint distribution taken into account was simulated using RFPA software. The profile of the caved roof is like a parabolic arch and caving height is 40 % --60 % of excavation advance span. Through comparative analysis, it is indicated that the higher the lateral pressure and the larger the excavation step, the smaller the caving height. The profile of the caved rock mass under high geo-stress changes gradually from parabolic shape to stratiform shape, while that with horizontal and vertical joints changes to be saddle- and tower-shaped,respectively. This work is valuable for productive mining at a low cost, elimination of potential danger and properly induced caving of goaf.