张鹏,刘博,邱贤阳,沈文博,曹日红,田志刚,李小元,支伟

• 1:中南大学资源与安全工程学院
• 2:长沙矿山研究院有限责任公司金属矿山安全技术国家重点实验室
• 3:深圳市中金岭南有色金属股份有限公司
• 4:广西中金岭南矿业有限责任公司

摘要(Abstract)：

在深部开采趋势与“双碳”目标双重压力下，地下矿山安全生产成为保障国家资源安全的核心环节。目前，国内有大量地下矿山将大直径深孔采矿法作为主力采矿方法，在实际生产过程中根据不同矿山的地质条件最大会形成宽度超过20 m的大跨度硐室。面对复杂的地下环境以及频繁的生产爆破作业扰动，了解大跨度硐室的动态响应特征显得十分重要。以盘龙铅锌矿为工程背景，通过FEM-DEM耦合数值模拟手段研究了爆源距离、硐室跨度对于上部硐室稳定性的影响。结果表明:(1)硐室跨度一定时，随着爆源距离从27.5 m减小到2.5 m，爆破后硐室周围塑性区块体和破坏裂隙的增幅分别为251.41%和42.12%，多次爆破作用扰动了硐室的稳定性;(2)随着爆源距离的减小，单次爆破作用后剪切破坏和拉剪破坏块体增量的增幅分别为66.25%和373.37%，块体破坏形式越复杂，硐室表面PPV越大，稳定性越弱;(3)整个爆破周期内，随着硐室跨度增大，硐室顶板的“冒落”位移从0.07 cm增大至2.08 cm、塑性区块体和破坏裂隙增幅分别为195.35%和208.49%，大跨度硐室稳定性越差;(4)大跨度硐室在静态开挖后处于弹性能积聚范围更广，能量水平更高不稳定状态，在爆破周期内弹性能进一步储存，使得大跨度硐室有着更高概率发生整体性破坏。研究结论对于地下矿山在爆破设计以及支护工程中具有一定的参考意义。

关键词(KeyWords)： 大跨度硐室;重复爆破;PPV;节理裂隙;塑性区;弹性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(52374152);; 中国五矿集团有限公司全国重点实验室专项资金项目(2024GZKJ05);; 中国博士后科学基金面上资助(2024M752145)~~

作者(Author): 张鹏,刘博,邱贤阳,沈文博,曹日红,田志刚,李小元,支伟

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