卧虎山铁矿采场极限暴露面积回归优化模型

地下矿山开采中，合理的采场暴露面积是保障采矿作业安全的前提，采场暴露面积作为地下采场的主要结构参数需要进行优化。以卧虎山矿27-31线为研究对象，运用3DMine-Midas- Flac^3D耦合建模技术，构建了地表、矿体和采场的精细化模型，在采场长度参数为30 m和40 m的条件下，设计了10种采场暴露面积计算方案，通过数值模拟获得采场顶板最大拉应力和两帮最大压应力，基于此建立了采场暴露面积与顶板最大拉应力及两帮最大压应力的回归优化模型，在有安全系数的保障下确定了采场极限暴露面积。研究结果表明：（1）经采场稳定分析，最大压应力主要出现在采场两帮的围岩，而最大拉应力出现在顶底板；（2）通过建立采场暴露面积与最大拉应力和最大压应力的回归函数关系曲线，获得暴露面积与应力的关系规律，即在相同采场暴露面积条件下，采场越长则拉应力越小，而在相同拉压应力限值情况下，采场越长则极限暴露面积越大；（3）以矿山生产安全系数1.3为基数，通过回归函数曲线规律，根据采场矿体的赋存条件，以30 m和40 m的采场长度值，确定卧虎山矿的极限暴露面积分别为450 m²和600 m²。当岩体力学参数改变时，亦可采用回归函数曲线规律自适应判定采场极限暴露面积和采场跨度。

Regress Optimize Model of Limit Exposure Area to Stope in Wohushan Iron Mine

In the mining of underground mines，the reasonable exposure area of stope is precondition to ensure the safety of mining operation.As the main structural parameter of underground mines，it is necessary for exposure area to be optimized.Taking Wohushan mine 27-31 line as the research object，a refined model of surface，orebody and stope model was built by using 3DMine-Midas-Flac^3Dcoupling modeling technology was built by .10 calculation schemes of stope exposure area were designed under the length conditions of 30 m and 40 m for stope.Maximum tension stress of stope roof and maximum compressive stress of wall rock were obtained through numerical simulation.The regression optimization model of exposure area with tensile stress of roof and compressive stress of wall rock was established to determine the reasonable limit exposure area of stope under the protection of safety factor.The results showed that：（1）Maximum compressive stress mainly occurs in stope pillar and maximum tensile stress appears in stope roof by stope stability analysis；（2）The relationship between exposure accumulation and stress was obtained by establishing regression function curve of exposed area and maximum tensile stress and maximum compressive stress of stope.Under the same stope exposure area condition，the longer the stope，the smaller tensile stress.With same stress limit case，the longer the stope，the bigger exposure limit；（3）Taking the mine production safety coefficient of 1.3 as the base，according to occurrence condition of orebody and stope，the limit exposed area of Wohushan mine was determined to be 450 m²and 600 m²by the regression function curve using 30 m and 40 m length of stope. When rock mass mechanical parameters change，the limit exposure area and span value of stope was confirmed through adaptive decision of the regression function curve.