基于修正摩尔库仑本构预留宽缝对闸室底板内力影响的研究

Influence of reserved wide joint on internal forces of chamber baseplate based on modified Mohr Coulomb model

随着船舶大型化和标准化,适应水头大、闸墙高的整体式闸室得到广泛应用。基于修正摩尔库仑本构探究预留宽缝对整体式闸室底板内力的影响,以关桥船闸为例,利用Midas GTS NX对闸室内力进行有限元分析。计算结果表明:1)修正摩尔库仑本构较Drucker-Prager本构在描述土体变形方面更具有优势;2)较无宽缝,预留宽缝可明显降低底板跨中负弯矩;3)合缝时间越晚,底板的最大负弯矩越小;4)综合考虑底板内力和闸墙稳定性,当墙后回填至高程35.5 m时,关桥船闸闸室底板应进行宽缝合缝;5)完建期和运行期,预留宽缝的闸室底板最大正、负弯矩分别发生在完建工况和检修工况,基底最大、最小应力分别发生在高水运用工况和检修工况。

With the upsizing and standardization of ships,the integral lock chamber which is suitable for high water head and high lock wall has been widely used.To explore the influence of the reserved wide joint on the internal force of the baseplate of the integral lock chamber,based on modified Mohr Coulomb model,this paper uses Midas GTS NX to perform finite element analysis of Guanqiao lock chamber.The results show that:1)The modified Mohr Coulomb Model has more advantages in describing soil deformation than Drucker Prager model.2)Compared with the absence of wide joint,the reserved wide joint can significantly reduce the hogging moment in the midspan of the baseplate.3)The later the time of closing joint is,the smaller the maximum of the hogging moment of the baseplate becomes.4)Considering the internal forces of the baseplate and the stability of the lock wall,when the level of the backfill soil behind the lock wall reaches the elevation of 35.5 m,the baseplate of Guanqiao lock chamber should fill the reserved wide joint.5)During completion and operation periods,the maximum of the sagging moment and hogging moment of the baseplate with reserved wide joint occur under the conditions of the completion and maintenance respectively,and the maximum and minimum of the foundation stress occur under the conditions of the high-water-level operation and maintenance respectively.