框架型深路堑支挡结构计算及支护效果对比分析

Calculation of Retaining Structure for Frame-type Deep Cutting and Comparative Analysis of Support Effect

研究目的:以哈尔滨西客运站工程实施为基础,提出一种新型深路堑支护结构———框架型桩板墙,并与灌注桩连续墙支护结构进行结构计算及对比分析,探讨框架型桩板墙在受力、变形和稳定性方面与常规支护结构的区别。研究结论:(1)框架型桩板墙通过横撑将支挡结构连接成一个整体,形成框架型整体空间结构。(2)框架型桩板墙结构受力均匀、整体变形协调,稳定性高,可以实现常规结构难以达到的支挡高度,且对周围建筑的影响较小,可以大幅减少征地拆迁。(3)与常规支护结构相比,框架型桩板墙结构对保证复杂环境下深路堑的稳定性有很好的作用,对路堑两侧土体的水平位移和路堑基地的上隆位移都能起到较好的约束作用,并能够较为有效地阻止路堑发生滑坡失稳,确保路堑整体结构的稳定。(4)研究成果可应用于超高支挡要求的路堑支挡工程以及环境复杂的城市地区、狭窄不利的场地等条件下的铁路、公路修建,对相应的铁路工程规划和建设有很强的借鉴和推广意义。

Research purposes： Compared with construction of Harbin West Station, a new kind of retaining structure of the frame- type pile plate wall for the deep cutting was presented and the calculation and analysis were made for its structure compared with the retaining structure of the boring pile to verify its distinctions with the conventional retaining structures in the areas of load bearing, deformation and stability. Research conclusions：（ 1 ） The frame -type pile plate wall is connected as a whole through its transverse supports to form a frame - type integral spacial structure. （2） The frame - type pile plate wall has the features of the evenly loading bearing, entirely coordinated deformation and high stability. So it can reach at the height that the conventional retaining structure can not reach at, with less impact on the surrounding building so that the land acquisition and demolition works can be much reduced. （3） Compared with the conventional retaining structure, the frame -type pile plate wall can play a big role in ensuring the stability of the deep cutting under complex environment and restricting the level shift of the soil on the both sides of the cutting and raising movement of the cutting foundation so that the landslide and unstability of the cutting can be effectively prevented and the stability of the whole cutting structure can be guaranteed. （4） This research result is available for the cutting project that needs high retaining and for constructions of railway and highway in the city proper with complex environment and in the narrow space, and it has the reference and applicable meanings for planing and construction of the similar railways.