The excavation of long-hole slot raises in a single lift comes with the difficulties of face jamming, insufficient face movement and boulder formation. The main reasons behind these problems are improper blast design, presence of geological discontinuities or inaccuracy in drilling. The proper blast design to get uniform breakage pattern for slot raise excavation consists of design of drilling, charging and delay parameters. This paper has discussed the numerical simulation based approach for assessment of blast induced deformation pattern in slot raise blasting. The numerical models with different variants of slot raise blast design was made for this purpose in Ansys-Explicit Dynamics. The model was given tested rock mass properties data of Rampura Agucha underground Lead–Zinc mine. The deformation pattern output for these variants were analysed. The analysis of deformation pattern suggests that the ratio of number of reamer holes and blast holes have more impact on deformation pattern. The more uniform deformation contour was observed for the cut hole blast with six reamer holes and five blast holes for the experimental site. The deformation pattern output for excavation of periphery holes were also analysed. The drilling pattern and delay timing for the slot raise blast was decided on the basis of model output. The experimental trials at the mine was taken on the basis of revised blasting pattern. The face jamming has been reduced with revised pattern. The blasting pattern has also been advantageous in reducing overall blasting cost by reducing the number of drill holes in cut portion.

在单个提升机中进行长孔槽提升的开挖会带来面部堵塞，面部移动不充分和巨石形成的困难。这些问题背后的主要原因是爆破设计不当，地质不连续性存在或钻孔不准确。为了获得均匀的破损模式以进行槽形隆起开挖，正确的爆破设计包括钻探，装料和延迟参数的设计。本文讨论了基于数值模拟的爆破评估方法槽隆起爆破中引起的变形模式。为此，在Ansys-Explicit Dynamics中创建了具有不同槽缝喷砂设计变体的数值模型。该模型已得到Rampura Agucha铅锌地下矿山的岩体特性测试数据。分析了这些变量的变形模式输出。变形模式的分析表明，扩孔器和爆破孔的数量比对变形模式的影响更大。对于实验位置，在具有六个铰刀孔和五个爆破孔的切孔爆破中观察到更均匀的变形轮廓。还分析了用于开挖外围孔的变形模式。狭缝隆起爆破的钻孔模式和延迟时间是根据模型输出确定的。矿场的试验是根据修改后的爆破方式进行的。修正了花样，减少了人脸卡纸的情况。喷砂图案还有利于通过减少切口部分中的钻孔数量来降低总体喷砂成本。