CAJ | 학술논문

埋深超过600 m的泥河铁矿一期工程设计为两阶段(-750 m阶段、-830 m阶段)充填开采，开拓巷道的稳定性是影响阶段开采顺序选择的关键因素之一。选取典型勘探线剖面建立二维有限元计算模型，根据一期工程可能的阶段开采顺序制定自下而上(方案一)和自上而下(方案二)2种计算方案。对2种方案各开采步骤进行有限元应力分析，对比2种方案下开拓巷道的围岩应力分布状态和巷道稳定的安全系数，选取合理的阶段开采顺序。结果表明，在开采过程中2种阶段开采顺序下的绝大部分巷道围岩局部有拉应力产生；方案二与方案一相比，拉应力的分布范围更小，开拓巷道围岩最小主应力最小值较大，安全系数也较高，开拓巷道更为稳定。因此，采用自上而下开采顺序的方案二即先采-750 m阶段、后采-830 m阶段的开采方案更优。
매심초과600 m적니하철광일기공정설계위량계단(-750 m계단、-830 m계단)충전개채，개탁항도적은정성시영향계단개채순서선택적관건인소지일。선취전형감탐선부면건립이유유한원계산모형，근거일기공정가능적계단개채순서제정자하이상(방안일)화자상이하(방안이)2충계산방안。대2충방안각개채보취진행유한원응력분석，대비2충방안하개탁항도적위암응력분포상태화항도은정적안전계수，선취합리적계단개채순서。결과표명，재개채과정중2충계단개채순서하적절대부분항도위암국부유랍응력산생；방안이여방안일상비，랍응력적분포범위경소，개탁항도위암최소주응력최소치교대，안전계수야교고，개탁항도경위은정。인차，채용자상이하개채순서적방안이즉선채-750 m계단、후채-830 m계단적개채방안경우。
Nihe Iron Mine with burial depth of over 600m is designed to be exploited by two-stage(-750 m lever,-830 m lever) backfill mining method in its first phase project. The stability of opening roadways is one of the key factors that affect the selection of stepwise mining sequence. The typical exploration profiles are chosen to establish two-dimensional finite ele-ment calculation models. Two calculation schemes which are the bottom-up stage mining sequence( scheme one) and the top-down stage mining sequence( scheme two) are formulated according to the possible stepwise mining sequences. Finite element stress analysis is conducted at different mining steps of the two schemes. The surrounding rock stress distribution of the opening roadways and safety factors of roadway stability are contrasted in the two schemes to select the reasonable stage mining se-quence. The results show that tensile stress occurs in the fractional rock-mass around the majority of opening roadways during exploitation in the two mining sequences. Compared with scheme one,tensile stress distribution region in scheme two is smal-ler,and minimums of minor principal stress in the surrounding rock of opening roadways are larger,with higher safety factors and more stable opening roadways. Therefore,scheme two which adopts the top-down stage mining sequence,namely mining -750 m level first and -830 m level later,is optimal.