关键词: 双排桩结构, 预加固处理, 深厚淤泥地基, 主动土压力区, 被动土压力区, 水平变位,

Abstract: Based on the case of double row pile structure foundation soil pre-reinforcement treatment in deep silt of Sanshantu reclamation project in Ninghai County, Zhejiang Province, this paper summarized and calculated the sensitivity of foundation soil pre-reinforcement that aimed at improving the overall bearing capacity of double row pile structure. The influence of the depth and width of pre-reinforcement on the internal force and horizontal displacement of double-row pile structure in the active soil pressure zone and passive soil pressure zone were analyzed by using the large-scale finite element calculation software. Also, the influence of soil treatment depth and anchor action on the internal force and horizontal displacement of double-row pile structure were studied. Through the comparison and analysis on a large number of numerical results, it was found that the soil pre-reinforcement in the passive area and the anchor action of the rear row pile had the most significant effect on the overall horizontal displacement control of the double row pile. The soil pre-reinforcement in the active earth pressure area could effectively reduce the soil pressure of double row pile structure, and the suggested parameters of the treatment range of the passive earth pressure zone and the active earth pressure zone were given. Soil pre-reinforcement between piles was relatively less significant for the overall displacement control of double row pile structure. On this basis of the engineering case, the analysis results can provide relevant technical reference for the popularization and application of double row pile structure.

Key words: double-row pile structure, structure internal force, active earth pressure zone, passive earth pressure zone, horizontal displacement, pre-reinforcement, foundation soil,