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一、概述铁路工程地质技术规范(TBJI2-85)规定:线路应避开溶岩特别发育地带,选择在非溶岩化地区或弱溶岩地区通过。但衡广复线南段跨越广州北郊流溪河上的江村南北两座大桥,却位于溶岩特别发育地带,因其各方面的综合考虑,桥址难于避开此处溶岩地层而挪移它处。这就提出了在地质“禁区”修建桥梁基础的技术难题。本纪初修建的粤汉线江村南北桥在新桥上游约110米处:如图1示。
First, an overview of Railway Engineering Geotechnical Specifications (TBJI2-85) provides that: the line should avoid the special development zone of lava, the choice of non-dissolved rock area or weak lava area through. However, the southern section of Hengguang-Sanxingdian crossing the north and south bridges of Jiangcun on the Liuxi River in the northern suburb of Guangzhou is located in the special development zone of lava. Due to the comprehensive consideration of all aspects, it is difficult for the bridge site to avoid the lava formation and divert it elsewhere. This raises the technical problem of constructing the bridge foundation in the “restricted area” of geology. At the beginning of this century, the construction of the Yue Han Line Jiangcun North and South Bridge in the bridge about 110 meters upstream: as shown in Figure 1.