双排桩支护在某综合交通枢纽工程应用探讨

Application of Support Structure of Double Row Pile in Construction of Comprehensive Traffic Hub

研究目的:结合某市在建综合交通枢纽工程,针对工程所处的城市垃圾填埋区的特殊地质条件和工程自身的特点,对如何运用双排桩支护结构形式在这一典型工程中进行设计探讨。研究结论:通过具体的工程实践,取得了双排桩设计的相关经验参数,与单排桩相比,双排桩支护结构能有效地控制基坑侧向变形和减小桩身弯矩,桩身弯矩更合理;考虑桩土相互作用的计算模型研究表明,随着开挖深度的增加,在影响范围内土体的水平位移逐渐增加,且基坑开挖对土体水平位移的影响程度随着土体的深度逐渐减小。

Research purposes： The article aims to combine the Hub Project, for the special geological conditions of the project in which the city landfill area and project their own characteristics, to explore how to use the double pile retaining structure in the typical project. Research conclusions： The relative parameters for design of the double - row pile was obtained by conducting the construction practice. Compared with the single - row pile, the structure of the double - row pile could effectively control the side -directional deformation of the foundation pit and reduce the bending moment of the pile to make the pile＇s bending moment more reasonable. The research on the computational model on consideration of the interaction between the pile and soil showed the horizontal shift of the soil in the influencing range gradually increased with increase of the excavation depth, but the influence of the excavation of the foundation pit on the horizontal shift of the soil gradually reduced with increase of the excavation depth.