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海底隧道相比陆地隧道更易导致突水等灾害,为了研究隧道围岩在孔隙水压力作用下的受力、变形规律、塑性区的变化以及力学参数不易准确给出的问题.首先在弹塑性本构方程积分算法—最近点投射算法(Closest Point Projection Method)中引入修正有效应力公式,使用C++语言编制了考虑孔隙水压力作用的弹塑性有限元求解程序,应用所编程序对不同孔隙水压力作用下隧道的位移场、应力场及塑性区进行模拟;其次基于智能优化算法—差异进化算法(Differential Evolution)和所编弹塑性有限元求解程序开发了智能反分析程序,对不同差异策略下反演参数的精度进行比较,分析了反演参数的演化趋势随着进化代数的变化规律.研究结果表明,所编制的考虑孔隙水压力作用的弹塑性有限元程序可以较好地进行数值计算,计算结果显示孔隙水压力对隧道的受力、变形及塑性区影响比较显著,随着孔隙水压力的增大,塑性区明显扩大.自主开发的智能反分析程序反演结果具有较高的精度,其中差异策略对反演精度影响较为明显,同时在反演时需综合选择算法的变异因子和交叉因子,以达到反演参数最优化的目的,可以将所开发的程序应用于实际隧道围岩力学参数反演,对设计及动态施工起到辅助作用.
Submarine tunnels are more likely to cause water inrush and other disasters than terrestrial tunnels. In order to study the stress, deformation and plastic zone changes of surrounding rocks of tunnels under the influence of pore water pressure, Constitutive equation integration algorithm - Closest Point Projection Method is introduced to amend the effective stress formula, the use of C + + language prepared pore water pressure of the elastic-plastic finite element program, the application of the program for different pore water pressure The displacement field, the stress field and the plastic zone of the lower tunnel are simulated. Secondly, the intelligent inverse analysis program is developed based on the intelligent optimization algorithm-Differential Evolution and the elastic-plastic finite element program. The inversion under different difference strategies The precision of the parameters is compared and the variation trend of the evolvement trend of the inversion parameters with the evolutionary algebra is analyzed.The results show that the elastoplastic finite element program which takes into account the effect of pore water pressure can be well calculated and the results The effect of pore water pressure on the stress, deformation and plastic zone of the tunnel is compared Significantly, with the increase of pore water pressure, the plastic zone expands significantly.The inversion results of self-developed intelligent inverse analysis program have high accuracy, of which the difference strategy has a more obvious effect on the inversion accuracy and at the same time need to be integrated The variation factor and the crossover factor of the algorithm are selected to achieve the purpose of the inversion parameter optimization. The developed program can be applied to the inversion of the mechanical parameters of the surrounding rock of the actual tunnel, which plays an auxiliary role in the design and dynamic construction.