碎裂矿段层间采动应力规律与优化  

Laws and Optimization of Interlayer Mining-induced Stress in Fragment Ore Section

作　　者：胡建华[1] 罗先伟[1] 周科平[1] 张绍国 黄应盟 

机构地区：[1]中南大学资源与安全工程学院,湖南省深部金属矿开发与灾害控制重点实验室,湖南长沙410083 [2]广西高峰矿业有限责任公司,广西河池547205

出　　处：《矿冶工程》2011年第5期18-21,25,共5页Mining and Metallurgical Engineering

基　　金：国家十一五科技支撑计划(2006BAB02A02);湖南省自然科学基金资助项目(09JJ4025);中南大学前沿研究计划资助项目(2010QZZD001);中南大学中央高校基本科研业务费专项资金资助(2011QNZT087)

摘　　要：应用Phase2D对高峰矿100号延伸矿体进行了空区充填影响下的碎裂矿段层间开采应力研究,获取了在碎裂矿段中的上向和下向不同开采顺序下的采动应力迁移规律。数值模拟结果显示,下向式开采主要表现出明显的压应力效应,最大压应力达到18 MPa,低于其抗压强度,最大拉应力值为0.47 MPa,低于顶板充填体的抗拉强度1.2 MPa,能够获得较高的安全系数,其值为1.57;而在上向式的采矿过程中,开采过程主要表现出拉应力效应,最大的拉应力为0.79 MPa,低于顶板矿石的抗拉强度,大于顶板弱结构面的抗剪强度,因而会导致弱结构面受拉破坏,形成顶板失稳。研究结果表明,在不同的开采顺序中,上向式开采的拉应力效应,有利于顶板矿体中弱结构面的发育与扩展,形成上层顶板的冒落,影响采场的采矿安全生产作业。为合理优化开采应力,改善采场的拉应力状态和承载结构,应选择下向式回采对碎裂矿段进行回采。Research has been done with Phase2D on the mining-induced stress between fragment ore sections after back-filling goafs in 100# extended ore-body, with moving law of mining-induced stress in fragment ore sections during over-hand and underhand mining obtained. Results from numeric simulation tests showed that during underhand mining, there was an obvious compression stress of maximally 18 MPa, which was lower than the compressive strength, and a tensile stress of maximally 0.47 MPa, which was lower than the tensile strength（ 1.2 MPa） of roof filling body, so a safety coefficient up to 1.57 could be obtained for the filling-body roof. While during overhand mining, there was a dominant tensile stress of maximally 0.79 MPa, which was lower than the tensile strength of roof and higher than the shear strength of weak structural plane in roof, resulting in roof unstable due to the destruction of weak structural plane under the impact of tensile stress. It was concluded that tensile stress during overhand mining contributing to the development and expansion of weak structural plane in roof rock body, would result in the roof falling and mining operation unsate in stope. In order to optimize the mining-induced stress and improve the tensile-stress state and loading structure in stope, it is suggested that underhand mining method should be adopted in fragment ore sections.

关 键 词：碎裂矿段 采动应力 数值模拟 开采顺序优化 

分 类 号：TD311[矿业工程—矿井建设]