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[求助] comsol 模拟出现问题了，求指导

用comsol multiphsysics5.1中的solid模块对煤层开挖进行模拟，但是解算的时候出现这些问题，求指导“除零错。
- 函数: /
计算符号微分变量失败。
- 变量: comp1.solid2.Qplast@VDN$comp1.solid2.Sl11@VDN$comp1.solid2.epl11
- 定义为: ((0.083333333333333329*(((3-sin(comp1.solid2.internalphi/unit_rad_cf))^2)*(0.5*((((-0.33333333333333331)*(2*((-comp1.solid2.D13)-(0.33333333333333331*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11)))))))+((-0.33333333333333331)*(2*((-comp1.solid2.D12)-(0.33333333333333331*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11))))))))+(0.66666666666666674*(2*((-comp1.solid2.D11)-(0.33333333333333331*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11)))))))))))-(((((dflc2hs(comp1.solid2.I1s,0)/0)-(dflc2hs(comp1.solid2.I1s-(((comp1.solid2.cohesion*3)*cos(comp1.solid2.internalphi/unit_rad_cf))/sin(comp1.solid2.internalphi/unit_rad_cf)),0)/0))*((((comp1.solid2.cohesion*cos(comp1.solid2.internalphi/unit_rad_cf))-((comp1.solid2.I1s*sin(comp1.solid2.internalphi/unit_rad_cf))/3))*2)*(-(0.33333333333333331*(sin(comp1.solid2.internalphi/unit_rad_cf)*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11))))))))+((((comp1.solid2.cohesion*cos(comp1.solid2.internalphi/unit_rad_cf))-((comp1.solid2.I1s*sin(comp1.solid2.internalphi/unit_rad_cf))/3))^2)*((((ddflc2hs(comp1.solid2.I1s,0)/0)*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11))))*Inf1.#INF)-(((ddflc2hs(comp1.solid2.I1s-(((comp1.solid2.cohesion*3)*cos(comp1.solid2.internalphi/unit_rad_cf))/sin(comp1.solid2.internalphi/unit_rad_cf)),0)/0)*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11))))*Inf1.#INF))))+((((-(sin(comp1.solid2.internalphi/unit_rad_cf)*0.33333333333333331))*(((comp1.solid2.cohesion*cos(comp1.solid2.internalphi/unit_rad_cf))-((comp1.solid2.I1s*sin(comp1.solid2.internalphi/unit_rad_cf))/3))*2))*(((dflc2hs(comp1.solid2.I1s,0)/0)*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11))))-((dflc2hs(comp1.solid2.I1s-(((comp1.solid2.cohesion*3)*cos(comp1.solid2.internalphi/unit_rad_cf))/sin(comp1.solid2.internalphi/unit_rad_cf)),0)/0)*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11))))))+((flc2hs(comp1.solid2.I1s,0)-flc2hs(comp1.solid2.I1s-(((comp1.solid2.cohesion*3)*cos(comp1.solid2.internalphi/unit_rad_cf))/sin(comp1.solid2.internalphi/unit_rad_cf)),0))*((-(sin(comp1.solid2.internalphi/unit_rad_cf)*0.33333333333333331))*(2*(-(0.33333333333333331*(sin(comp1.solid2.internalphi/unit_rad_cf)*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11))))))))))))+((((-(dflc2hs(-comp1.solid2.I1s,0)/0))*(((comp1.solid2.cohesion*cos(comp1.solid2.internalphi/unit_rad_cf))^2)*(((Inf*comp1.solid2.I1s)*2)*(Inf*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11)))))))+((((comp1.solid2.cohesion*cos(comp1.solid2.internalphi/unit_rad_cf))^2)*(((Inf*comp1.solid2.I1s)^2)+(-1)))*(-(((ddflc2hs(-comp1.solid2.I1s,0)/0)*(-((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11)))))*Inf1.#INF))))+(((((comp1.solid2.cohesion*cos(comp1.solid2.internalphi/unit_rad_cf))^2)*(Inf*((Inf*comp1.solid2.I1s)*2)))*((dflc2hs(-comp1.solid2.I1s,0)/0)*(-((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11))))))+(flc2hs(-comp1.solid2.I1s,0)*(((comp1.solid2.cohesion*cos(comp1.solid2.internalphi/unit_rad_cf))^2)*(Inf*(2*(Inf*((-comp1.solid2.D13)+((-comp1.solid2.D12)+(-comp1.solid2.D11))))))))))
计算表达式失败。
- 表达式: d(d(comp1.solid2.Qplast,comp1.solid2.Sl11),comp1.solid2.epl11)
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