有限宽度崩落矿岩散体侧压力分布规律
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摘要
金属矿山崩落矿岩散体侧压力对支撑围岩和控制岩体移动具有不可忽视的作用.采用散体颗粒流侧向压力测试实验系统,以弓长岭铁矿崩落矿石为例,研究有限宽度散体崩落矿岩侧压力分布规律:散体静止侧压力随散体埋深的增加呈非线性增加趋势,并基于量纲和谐原理回归散体侧压力随埋深和角度的变化计算式;在无散体回填工况下,散体侧压力随散体放出量的增加而减小,增加散体放出范围,可加速散体侧压力下降速度;在散体回填工况条件下,以模型中间为界,随着散体放出,下部4个测点侧压力值降低,上部4个测点侧压力值升高.上盘侧散体侧压力总体受放矿流动的影响不明显,放矿开始后的突变量也要明显小于下盘侧压力,即在散体补充条件下,散体放出对散体侧压力的影响范围在高度和宽度上都是有限的.该成果对揭示散体承压机理,开发崩落矿岩散体在矿山工程中的应用具有指导意义.
The lateral pressure of caved ore-rock in metal mine has a significant effect on supporting the surrounding rock and controlling the rock mass movement. Taken the caved ore in Gongchangling Iron Mine as an example,the distribution lawof the granular lateral pressure in the caved ore-rock with the limited width was studied. The experiment results showthat the static lateral pressure was nonlinear increase with granular buried depth increase,the formula of granular pressure changed with buried depth and angle was obtained by regression based on the theory of dimensional harmonious principle. In the case of no backfill, the granular lateral pressure decreases with the increase of the discharge amount, the range of drawing increasing can accelerate the decreased speed of granular lateral pressure. The pressure values of the lower four measuring points decrease with the drawing amount,and the pressure values of the upper four measuring points increase. The break variable of lateral pressure at hanging wall is lower than the value at footwall,and the drawing amount has less influence on the lateral pressure of hanging wall. That is to say that the drawing amount has limited influence range on the granular lateral pressure in height and width under the condition of backfill. This achievement has guiding significance for revealing the pressure bearing mechanism and application in the mine engineering of granular.
The lateral pressure of caved ore-rock in metal mine has a significant effect on supporting the surrounding rock and controlling the rock mass movement. Taken the caved ore in Gongchangling Iron Mine as an example,the distribution lawof the granular lateral pressure in the caved ore-rock with the limited width was studied. The experiment results showthat the static lateral pressure was nonlinear increase with granular buried depth increase,the formula of granular pressure changed with buried depth and angle was obtained by regression based on the theory of dimensional harmonious principle. In the case of no backfill, the granular lateral pressure decreases with the increase of the discharge amount, the range of drawing increasing can accelerate the decreased speed of granular lateral pressure. The pressure values of the lower four measuring points decrease with the drawing amount,and the pressure values of the upper four measuring points increase. The break variable of lateral pressure at hanging wall is lower than the value at footwall,and the drawing amount has less influence on the lateral pressure of hanging wall. That is to say that the drawing amount has limited influence range on the granular lateral pressure in height and width under the condition of backfill. This achievement has guiding significance for revealing the pressure bearing mechanism and application in the mine engineering of granular.
引文
[1]Lambe T W,Whitman R V.Soil mechanics[M].New York:John Wiley&Sons,Inc,1969.
[2]Reimbert M,Reimbert A.Pressure and over pressure vertical and horizontal silos[C]//International Conference on Design of Silos for Strength and Flow.London:Powder Advisory Cent London,1980.
[3]Brauer K,Pfitzner M,Krimer D O.Granular elasticity:stress distributions in silos and under point loads[J].Physical Review E,2006,74(6):11-14.
[4]Yang S C,Hsiau S S.The simulation and experimental study of granular materials discharged from a silo with the placement of inserts[J].Powder Technology,2001,120(3):244-255.
[5]Brown R L,Richards J C.Kinematics of the flow of dry powders and bulk solids[J].Rheologica Acta,1965,4(3):153-165.
[6]Walker D M.An approximate theory for pressure and arching in hoppers[J].Chemical Engineering Science,1966,21:976-997.
[7]戴兴国,古德生,吴爱祥.散体矿岩静压分析与计算[J].中南大学学报(自然科学版),1995,26(5):584-588.(Dai Xing-guo,Gu De-sheng,Wu Ai-xiang.Analysis and computation of static pressure in loose ore and stuff[J].Journal of Central South University(Science and Technology),1995,26(5):584-588.)
[8]陈喜山.古典杨森散体压力理论的拓展及采矿工程中的应用[J].岩土工程学报,2010,32(2):315-319.(Chen Xi-shan.Extension of classical Janssen loose mass pressure theory and its application in mining engineering[J].Chinese Journal of Geotechnical Engineering,2010,32(2):315-319.)
[9]王闫超,晏鄂川,陆文博,等.无黏性有限土体主动土压力解析解[J].岩土力学,2016,37(9):2513-2520.(Wang Yan-chao,Yan E-chuan,Lu Wen-bo,et al.Analytical solution of active earth pressure for limited cohesionless soils[J].Rock and Soil Mechanics,2016,37(9):2513-2520.)
[10]杨明辉,戴夏斌,赵明华,等.墙后有限宽度无黏性土主动土压力试验研究[J].岩土工程学报,2016,38(1):132-137.(Yang Ming-hui,Dai Xia-bin,Zhao Ming-hua,et al.Experimental study on active earth pressure of cohesionless soil with limited width behind retaining wall[J].Chinese Journal of Geotechnical Engineering,2016,38(1):132-137.)
[2]Reimbert M,Reimbert A.Pressure and over pressure vertical and horizontal silos[C]//International Conference on Design of Silos for Strength and Flow.London:Powder Advisory Cent London,1980.
[3]Brauer K,Pfitzner M,Krimer D O.Granular elasticity:stress distributions in silos and under point loads[J].Physical Review E,2006,74(6):11-14.
[4]Yang S C,Hsiau S S.The simulation and experimental study of granular materials discharged from a silo with the placement of inserts[J].Powder Technology,2001,120(3):244-255.
[5]Brown R L,Richards J C.Kinematics of the flow of dry powders and bulk solids[J].Rheologica Acta,1965,4(3):153-165.
[6]Walker D M.An approximate theory for pressure and arching in hoppers[J].Chemical Engineering Science,1966,21:976-997.
[7]戴兴国,古德生,吴爱祥.散体矿岩静压分析与计算[J].中南大学学报(自然科学版),1995,26(5):584-588.(Dai Xing-guo,Gu De-sheng,Wu Ai-xiang.Analysis and computation of static pressure in loose ore and stuff[J].Journal of Central South University(Science and Technology),1995,26(5):584-588.)
[8]陈喜山.古典杨森散体压力理论的拓展及采矿工程中的应用[J].岩土工程学报,2010,32(2):315-319.(Chen Xi-shan.Extension of classical Janssen loose mass pressure theory and its application in mining engineering[J].Chinese Journal of Geotechnical Engineering,2010,32(2):315-319.)
[9]王闫超,晏鄂川,陆文博,等.无黏性有限土体主动土压力解析解[J].岩土力学,2016,37(9):2513-2520.(Wang Yan-chao,Yan E-chuan,Lu Wen-bo,et al.Analytical solution of active earth pressure for limited cohesionless soils[J].Rock and Soil Mechanics,2016,37(9):2513-2520.)
[10]杨明辉,戴夏斌,赵明华,等.墙后有限宽度无黏性土主动土压力试验研究[J].岩土工程学报,2016,38(1):132-137.(Yang Ming-hui,Dai Xia-bin,Zhao Ming-hua,et al.Experimental study on active earth pressure of cohesionless soil with limited width behind retaining wall[J].Chinese Journal of Geotechnical Engineering,2016,38(1):132-137.)