孔隙水压力作用的弹塑性CPPM算法及隧道围岩力学参数反演  

Elastoplastic CPPM Algorithm and Mechanical Parameters Inversion of Tunnel Surrounding Rock Under the Action of Pore Water Pressure

作　　者：王军祥[1] 姜谙男[1] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026

出　　处：《应用基础与工程科学学报》2014年第3期525-538,共14页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(51079010);中央高校基本科研业务费专项资金项目(2013YB03;3132013315);中央高校基本科研业务优秀科技创新团队培育计划资助项目(3132014326);大连市交通科技项目(2011-10);吉林省交通厅交通运输科技项目(2012-1-6)

摘　　要：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.Subsea tunnel compared to land tunnel is more likely to resuh in water disasters, and the regularity of stress and deformation, the change process of plastic zone and the inaccurate problem of mechanical parameters of subsea tunnel surrounding rock are expected to research under the action of pore water pressure. Firstly, the modified effective stress formula is introduced into the closest point projection method（CPPM） of the constitutive equation ,and the self-developed elastoplastic finite element program is compiled by C ＋＋ considering the action of pore water pressure. The displacement field, stress field and the change of plastic zone of tunnel are simulated under the action of different pore water pressure. Secondly, parameters inversion of surrounding rock which is based on intelligent optimization algorithm-differential evolution algorithm （DE）is conducted, and the precision of the inversion parameters is researched with the different variation strategies of the algorithm. The evolution trend of inversion parameters is analyzed with the change of evolutionary algebra. Finally, the results show that pore water pressure plays an important role in the deformation, stress and plastic zone of circular tunnel. Effective stress decreases along with the increase of pore water pressure, and plastic zone expands significantly. The influence of different variation strategies is quite obvious for the inversion precision, and algorithm parameters are expected to comprehensively select in the inversion calculation so as to achieve the purpose of inversion parameters optimization. It can be applied to mechanical parameters inversion of surrounding rock of the actual tunnel, which plays a supporting role to design and dynamic construction.

关 键 词：海底隧道 孔隙水压力 塑性区 最近点投射算法 参数反演 

分 类 号：TU452[建筑科学—岩土工程]