异型水泥土重力式围护墙的变形和经济效益分析

Analysis of Deformation and Economic Benefit of Shaped Gradient Cement-Soil Gravity Wall

摘要: 基坑设计过程中，若基坑的重力式围护墙水平位移略大于规范要求，应选择何种方式加固重力式围护墙受到了越来越大的关注。根据复旦大学江湾校区化学楼与环境科学楼基坑开挖过程中实时监测数据，利用有限元反演方法，建立Plaxis应力应变分析模型。结果表明，采用反演法分析得到的土体参数优于土工试验数据，更适用于实际工况。并在此模型基础上，考虑分析了五种加固重力式围护墙的方法。得出结论，台阶加宽、底部台阶靠近坑内两种围护墙加固形式更优，更为经济。理论上，台阶加宽是最为经济的加固方式。并发现，靠近坑内底部台阶长宽比越大，加固方式越经济；而加宽的台阶长宽比越小，加固方式越经济。本文对异型水泥土重力式围护墙的经济效益展开分析，对类似工程具有参考意义。

Abstract: If the horizontal displacement of the gravity-type retaining wall of the foundation pit is slightly larg-er than the specification requirements in the design process of the foundation pit, the way to strengthen the gravity-type retaining wall should be paid more and more attention. This paper uses the finite element numerical inversion method to establish the Plaxis stress and strain analysis model with reference to the real-time monitoring data in the excavation process of the chemical building and environmental science building of Jiangwan Campus of Fudan University. And the re-sults show that the soil parameters obtained by the inversion method are better than the geotech-nical experimental data, and are more suitable for practical conditions. Based on this model, five methods for reinforcing the gravity retaining wall are put forward. It is concluded that the steps are widened and the bottom steps are close to the pit in this paper. The two types of retaining walls are better and more economical. In theory, widening the steps is the most economical way to reinforce. It is found that the larger the aspect ratio of the step near the bottom of the pit, the more economical the reinforcement method; and the smaller the aspect ratio of the widened step, the more economical the reinforcement method. This paper analyzes the economic benefits of the gravity-type retaining wall of special-shaped cement soil, which has reference significance for similar projects.