云桂高速铁路南盘江特大桥5号拱座边坡岩体卸荷带特征分析

发布时间：2018-01-18 15:29

本文关键词：云桂高速铁路南盘江特大桥5号拱座边坡岩体卸荷带特征分析　出处：《铁道标准设计》2017年04期 　论文类型：期刊论文

【摘要】：云桂高速铁路南盘江特大桥为主跨416 m的上承式钢管混凝土拱桥,为云桂高速铁路的控制性工程之一。通过工程地质测绘、钻探及平硐勘探等方法和手段,查明特大桥5号拱座边坡岩体的卸荷性状,并在现场平板静力载荷试验的基础上,确定5号拱座基础的承载力,为特大桥的设计和施工提供可靠的地质参数。分析表明:南盘江特大桥5号拱座边坡岩体强卸荷带水平发育深度18~25 m,弱卸荷带水平发育深度26~43 m。边坡岩体具有卸荷带与风化带同时共存的双层地质结构特征。边坡岩体卸荷带发育的深度与边坡形态相关,且受地层岩性和地质构造影响严重。根据现场平板静力载荷试验及相关规范,确定5号拱座基础其基本承载力σ0处于742~867 k Pa。
[Abstract]:Yun Gui high-speed railway Nanpanjiang bridge main span of 416 m steel tube concrete arch bridge, one of the Yun Gui high-speed railway control projects. Through the engineering geological mapping, drilling and exploration adit and other means, to identify characters of bearing Unloading Bridge No. 5 abutment rock slope, and on the basis of field static plate load test, determine the capacity of No. 5 abutment foundation, provide reliable geological parameters for the design and construction of the bridge. The analysis shows: Nanpanjiang River Bridge No. 5 abutment rock slope with horizontal development depth of strong unloading 18~25 m weak unloading zone development level 26~43 M. depth of rock slope with unloading belt and with double weathering characteristics of the geological structure coexist. The depth of the slope rock mass unloading zone associated with the shape of the slope, which is affected by geological structure and lithology. According to the static plate loading test and related No. 5 standard, determine the basic bearing capacity of arch support in 742~867 K Pa. 0.

【作者单位】：中铁二院工程集团有限责任公司;
【基金】：国家铁路局科技研究计划(KF2014-019) 中铁二院工程集团有限责任公司科研项目(院计划14126005(14-17))
【分类号】：U442.2
【正文快照】： 高陡边坡岩体卸荷是自然界普遍存在的一种地质现象,是伴随着构造作用下河谷侵蚀下切或边坡开挖的过程中,坡体内三向体积力逐渐转向两向平面应力的过程中由岩体内侧向外应力释放,使得边坡岩体向临空面产生卸荷回弹变形,而谷坡应力场产生新的调整并达到新的动态平衡,伴随这一过

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