期望体理论的实验研究及端部放矿崩矿步距优化

放出体形态研究是研究崩落矿岩流动规律和确定最优采场结构参数的基础.基于标志颗粒法，通过底部与端部放矿物理实验，研究无限边界条件和半无限边界条件下放出体形态及其变化规律，验证期望体理论的可靠性和适用性.在此基础上，开展了18 m×20 m结构参数下端部放矿崩矿步距的优化实验研究.研究结果表明：实际放出体形态并不是标准的椭球体，而是与期望体更为相近；在无限边界条件和半无限边界条件下，放矿量与放出体高度满足幂函数关系，与放出体半径满足指数函数关系；建议在18 m×20 m结构参数下，优先选用无贫化放矿方式和4.6 m的崩矿步距.

Experimental research on the expectation body theory and optimization of the rate of advance during ore breaking in side drawing

Studies on the shape of an isolated extraction zone are the basis for investigating the flow laws of caved ore and rock and optimizing a stope’ s structural parameters. Based on the method of labeled markers, the shape of an isolated extraction zone and its changing law under both infinite and semi-infinite boundary conditions were analyzed, and the reliability and suitability of the ex-pectation body theory were validated through bottom and side drawing tests. On this basis, research on the rate of advance during ore breaking in side drawing was performed at the structural parameter of 18 m í 20 m. The results show that the actual shape of the isola-ted extraction zone is not a standard ellipsoid, but more similar to the expectation body. Under both infinite and semi-infinite boundary conditions, the mass drawn has a power function relation with the height of the isolated extraction zone and has an exponential function relation with the radius of the isolated extraction zone. It is suggested that the non-dilution drawing mode and the 4. 6-m rate of ad-vance during ore breaking should be preferentially used at the structural parameter of 18 m í 20 m.