金属矿山
金屬礦山
금속광산
METAL MINE
2015年
1期
29-33
,共5页
动力稳定%安全系数%时程分析%LS-DYNA%数值模拟
動力穩定%安全繫數%時程分析%LS-DYNA%數值模擬
동력은정%안전계수%시정분석%LS-DYNA%수치모의
Dynamic stability%Safety coefficient%Time history analysis%LS-DYNA%Numerical simulation
针对露天矿开采过程中，爆破开挖作业对最终边坡稳定的影响问题，采用动力有限元法分析爆破过程中边坡的稳定性随时间变化情况。首先建立矿山边坡的二维有限元模型，利用有限元强度折减法求解，得到边坡的最危险滑动面及折减安全系数；再根据得到的最危险滑动面，重新建立边坡和炸药的三维实体模型，布置爆破孔网参数并设置各个炮孔的起爆时间，通过LS-DYNA大型动力有限元程序，求解边坡在炸药爆炸后30 s时间内的动力响应过程。结合极限平衡法和动力有限元法计算结果，计算边坡在同时起爆方式下每一时刻的安全系数。提出应根据边坡时程安全系数及边坡滑面单元是否同时发生整体破坏等条件综合评价边坡稳定性。数值模拟结果能够动态显示爆破过程中边坡的应力、应变状态，计算结果与极限平衡法计算结果接近，可以为露天矿爆破设计提供参考。
針對露天礦開採過程中，爆破開挖作業對最終邊坡穩定的影響問題，採用動力有限元法分析爆破過程中邊坡的穩定性隨時間變化情況。首先建立礦山邊坡的二維有限元模型，利用有限元彊度摺減法求解，得到邊坡的最危險滑動麵及摺減安全繫數；再根據得到的最危險滑動麵，重新建立邊坡和炸藥的三維實體模型，佈置爆破孔網參數併設置各箇砲孔的起爆時間，通過LS-DYNA大型動力有限元程序，求解邊坡在炸藥爆炸後30 s時間內的動力響應過程。結閤極限平衡法和動力有限元法計算結果，計算邊坡在同時起爆方式下每一時刻的安全繫數。提齣應根據邊坡時程安全繫數及邊坡滑麵單元是否同時髮生整體破壞等條件綜閤評價邊坡穩定性。數值模擬結果能夠動態顯示爆破過程中邊坡的應力、應變狀態，計算結果與極限平衡法計算結果接近，可以為露天礦爆破設計提供參攷。
침대로천광개채과정중，폭파개알작업대최종변파은정적영향문제，채용동력유한원법분석폭파과정중변파적은정성수시간변화정황。수선건립광산변파적이유유한원모형，이용유한원강도절감법구해，득도변파적최위험활동면급절감안전계수；재근거득도적최위험활동면，중신건립변파화작약적삼유실체모형，포치폭파공망삼수병설치각개포공적기폭시간，통과LS-DYNA대형동력유한원정서，구해변파재작약폭작후30 s시간내적동력향응과정。결합겁한평형법화동력유한원법계산결과，계산변파재동시기폭방식하매일시각적안전계수。제출응근거변파시정안전계수급변파활면단원시부동시발생정체파배등조건종합평개변파은정성。수치모의결과능구동태현시폭파과정중변파적응력、응변상태，계산결과여겁한평형법계산결과접근，가이위로천광폭파설계제공삼고。
For the significant impact of blasting on slope stability during open-pit mining process,the dynamic finite ele-ment method is used to analyze the variation of slope stability with the time in blasting. Firstly,the finite element model of mine slope is established,then the finite element strength reduction method is adopted to get the most dangerous sliding surface and safety coefficient of the slope. After that,based on the most dangerous sliding surface obtained,a three-dimensional entity model of slope and explosives was created,the blasting parameters are arranged and the initiation time for each hole is set up. Next, this model is calculated after the initiation. The dynamic response process after slope explosive for 30 s is solved by LS-DYNA large dynamic finite element program. Combining with the limit equilibrium method and dynamic finite element method, the safety factors of slope at every moment under unified detonation are calculated. Slope stability should be comprehensively evalu-ated by the time-history safety coefficient and whether the elements of the sliding surface are destroyed at the same time. The simulation results can dynamically display the security status of slope blasting process,and the result is very close to that by the limit equilibrium method. This research could make a reference for the blasting design.
