【作者】 裴颖洁；

【导师】 刘建起；

【作者基本信息】 天津大学 ， 港口、海岸与近海工程， 2004， 硕士

【摘要】 本文在模型试验研究的基础上，针对地下连续墙与土相互作用的特点，采用大型通用有限元软件Ansys分别建立以极限平衡理论、弹性抗力理论以及考虑土体弹塑性的有限元理论为基础的三类数值模型，并进行数值模拟计算。在研究三类模型的土与墙体的相互作用时，分别采用了等值梁法、m值法以及Ansys中的接触方法，对等刚度和变刚度模型墙体进行了分析计算，并利用试验数据对计算结果进行了比较。墙体位移以及内力值与试验结果吻合较好，证明数值模拟是合理可行的。其中着重讨论了模型墙体在两端铰接情况下其内力以及变形的特点。从试验数据和计算结果中可发现，墙端铰接以及墙体的刚度变化会给内力以及变形带来显著的影响，产生的横向弯矩在量值上几乎与纵向弯矩相等。在实际工程领域，设计人员在计算地下连续墙体的内力值时，往往不考虑横向弯矩的影响，只是按照构造配筋，这是不妥当的。此外，本文还对弹性抗力理论中的m值法进行了讨论。在实际当中，设计人员一般都是通过查表的方法来找出m值，而规范给出的m值的范围太大，势必会造成计算上的误差。因此本文通过拟合试验数据，找出m值与土面位移的非线性关系，然后通过模拟软件反复迭代的方法，找出最合适的m值，从而得出较为准确的墙体内力变形值。更多还原

【Abstract】 On the basis of the experiment, considering the characteristics of interaction between the diaphragm wall and soil, general finite element software Ansys is used to set up three kind of numeral models which based on the theory of ultimate balance, the theory of the elastic compressive resistance and the theory of finite element which considered the elastoplasticity of the soil. And they were calculated with numerical analysis. The model wall with changeless rigidity and varying rigidity were calculated by the method of equal value beam, the method of m and the method of contact surface in the Ansys software. Compared with the results of the model test, the calculated values of displacements and moments are accurate enough. It is proved that the numerical analysis is feasible. The moments and displacements of the model wall with hinged ends are studied specially. I found that the hinged ends and the varying rigidity can affect the values of moments and displacement very much. The values of transverse moments are almost equal with longitudinal moments. Many engineer often ignored the transverse moments and the reinforcement is designed as constructional reinforcement. Obviously, it isn’t right.What’s more, this paper has discussed the m method. In practice, many people look for the m value in the m table which has been specified by the codes. But the range of the values of m is so large that it leads to more error. For the reason of this, this paper provide a new method to find out more accurate m value. By the way of modifying the function between the test results of m value and the displacement of model wall, put the m value into the Ansys procedure and calculated iteratively, then it would find the most accurate m value.更多还原