软土地基新开河道挡墙水平位移影响研究

Study on Influence of Horizontal Displacement of Newly Opened River Retaining Wall in Soft Soil Foundation

摘要:

挡土墙桩基水平位移计算是上海地区软土地基上水利水运工程挡墙设计的重要环节。常用的m法在实际使用过程中存在多项局限。在上海地区某实地开挖河道工程中，为验证位移原因并计算最终位移量，采用了m法和有限元两种方法。结果表明：根据现行不同规范m值取值推荐进行计算，结果差异较大。将有限元法计算结果与m法计算结果进行比较可以看出地质条件对于位移的影响效应方面有限元法与采用m法按照《地基基础设计标准》和《防汛墙工程设计标准》测算的结果较为接近，但采用有限元法计算的墙顶累计水平位移值较采用m法计算的结果更大。

Abstract:

The horizontal displacement calculation of retaining wall pile foundation is an important link in the design of retaining wall in the water conservancy and waterway engineering on the soft soil foundation in Shanghai. The commonly used m method has many limitations in practice. In a river excavating project on site of Shanghai, Two methods of m method and finite element method are used to verify the displacement cause and calculate the final displacement. The result shows that according to the recommended value of m value in different current specifications, the results are quite different. The comparison of the results by the finite element method and m method can shows that the influence effect of geological conditions on displacement by finite element method is close to that calculated by m method in accordance with Design Standards for Foundation and Design Standards for Flood Control Wall Engineering. However, the cumulative horizontal displacement of the wall top calculated by the finite element method is larger than that calculated by the m method.