运用非线性Mohr-Coulomb破坏准则分析尾矿坝稳定性

为了获得尾矿坝上限安全系数,采用切线法将非线性Mohr-Coulomb破坏准则与极限分析上限法相结合,基于尾矿坝对数螺旋破坏模式,建立了基于极限分析上限定理的尾矿坝非线性安全系数上限分析模型。以某尾矿坝为工程背景,求解得到了不同非线性系数和抗拉强度下的安全系数。结果表明,尾矿坝的安全系数随着非线性系数和抗拉强度的增大,呈递减趋势。在满足尾矿坝设计安全的前提下,运用尾矿坝上限非线性安全系数数学模型,反演设计参数,根据反演结果可优化设计方案。

Stability analysis of tailings dam using the nonlinear Mohr-Coulomb failure criterion

To obtain the upper bound safety factors of tailings dam, the nonlinear Mohr-Coulomb failure criterion was combined with the limit analysis upper bound method by the tangent method, based on the logarithmic spiral failure mode of tailings dam, the upper bound nonlinear safety factor analysis model of tailings dam was established. Taking a tailings dam as an example, using the upper bound nonlinear safety factor analysis model, the safety factors under different nonlinear coefficients and tensile strength were obtained. Results indicated that the safety factor of tailings dam decreased with the increase of nonlinear coefficient and tensile strength. On the premise of satisfying the safety of tailings dam design, the upper bound nonlinear safety factor model of tailings dam was used to invert the design parameters. According to the inversion results, the design scheme can be optimized.