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1、采矿工程数值计算方法——FLAC建模技巧与工程应用1FLAC建模方法1.1建模(1)设计计算模型的尺寸(2)规划计算网格数目和分布(3)安排工程对象(开挖、支护等)(4)给出材料的力学参数(5)确定边界条件(6)计算模拟1.2网格生成:Gridi,j例如:grid30,201.3网格规划:Genx1,y1x2,y2x3,y3x4,y4例如:Gen0,00,1010,2020,01.4分区规划网格。例如:GenxI1,yI1xI2,yI2xI3,yI3xI4,yI4i=1,10j=1,21(I区)GenxII1,yII1xII2,yII2xI
2、I3,yII3xII4,yII4i=10,20j=1,21(II区)1.5特殊形状的网格(1)圆形gencirclexc,ycrad(2)弧线genarcxc,ycxb,ybtheta(3)直线genlinex1,y1x2,y2(4)任意形状tab1x1,y1,x2,y2,¼,xn,yn,x1,y1gentab11.6赋给单元材料性质mode(弹性)propd1800e-6bu12.5sh5.77i=1,20j=1,10propd2400e-6bu1250sh577i=1,20j=11,20modm(弹塑性Mohr-Coulumb准则)pr
3、opd1800e-6bu12.5sh5.77c0fri20ten0.015regi,j1.7赋给模型边界条件(1)固定边界(结点)Fixxi=1,j=1,21Fixyi=1,21j=1(2)施加边界力(结点)applyyf-10i=1,21j=21或applysyy-10i=1,21j=21或applyxf-5i=21,j=1,21或applysxx-5i=21,j=1,21(3)赋单元内应力(单元)inisxx-10i=1,20j=1,20inisyy-5var04i=1,21j=1,211.8计算Setgrav9.81SetlargeS
4、tep1000Savetest.sav1.9结果显示Plotgrid显示网格Plotbo显示边界Plotplas显示塑性区Plotsig1fi显示最大主应力s1Plotsig2fi显示最小主应力s2Plotsdiffi显示主应力差(s1-s2)Plotstr显示主应力矢量场Plotxdisfi显示X方向位移Plotydisfi显示Y方向位移Plotdisp显示位移矢量场1.10保存与调用结果命令Calltest.txt(或catest.dat)调用数据Savetest.sav保存结果New重新开始Resttest.sav调用结果Quit退出
5、程序2.FLAC运用技巧2.1模型尺寸2.2模拟开挖Modnui=6,15j=5,12(或regioni,j)2.3模拟锚杆支护(端锚)structcablebegingridi1,j1endgridi2,j2segnprop1struprop1e2e5yield0.5a0.235e-3sbond0kbond0.0001struprop1sfri30peri0.2723den7.5e-32.4模拟锚杆支护(全长锚固)structcablebegingridi,jendx,ysegnprop2struprop1e2e5yield0.5a0.2
6、35e-3sbond0.42kbond5.37struprop1sfri30perimeter0.2723den7.5e-32.5模拟锚杆支护(预应力锚固)structcablebegingridi1,j1endi2,j2segnten10prop1structcablebeginnoden1endx,ysegnprop2struprop1e2e5yield0.5a0.235e-3sbond0.kbond0.1struprop1sfri0perimeter0.2723den7.5e-3struprop2e2e5yield0.5a0.235e
7、-3sb0.42kb5.37struprop2sfri30perimeter0.2723den7.5e-32.6模拟断层Modnuj=37int1asfromi1,j1to,i1,j2bsfromi2,j1toi2,j2int1kn1000ks400fri25c0.01t0.00012.7其它技巧(1)网格优化(2)先弹性、后塑性(3)分步开挖(4)动力学问题模拟(5)固流耦合问题模拟(6)合理解释结果(7)多种形式输出结果(8)报告格式Thepurposeofcomputingisin-sight,notnumbers.—FLACManu
8、alsnewplblgr(网格生成)genzonebrickp0000p114000p2010p30060(块的尺寸)size20110(块个数)groupfloorgenzon