地铁站换乘通道开挖对既有桩基的影响分析

针对北京地铁10号线国贸桥地铁站换乘通道的设计和施工方案,采用有限差分数值模拟方法对不同方案下地铁车站换乘通道暗挖施工过程中上部既有桩基的受力特性及位移变化规律进行模拟,据以制定合理的施工方案。研究结果表明:在不对桥桩采取加固措施的情况下,地表沉降量和桥桩沉降量均较大,桥基承载力损失严重,严重影响到桥桩的稳定性。因此,在换乘通道开挖过程中,必须采取相应的工程加固措施来确保桥桩的稳定。

ANALYSIS OF INFLUENCE OF SUBWAY STATION TRANSFER CHANNEL EXCAVATION ON EXISTING PILE FOUNDATION

Based on the design and construction scheme of transfer channel in International Trade Station of Beijing Subway No. 10 Line, finite difference method is used to simulate the stress characteristic of existing piles and the displacement law during the excavation under subway station transfer channel construction, and the reasonable construction scheme is brought out. It is proved from the result that, if there aren't reinforcement measures on bridge piles, surface subsidence and settlement of bridge piles are large, and the bridge bearing capacity will be reduced seriously, therefore, the stability of bridge piles will be impacted seriously. As a result, during the excavation process of transfer channel, reinforcement measures are necessary to make sure the stability of bridge piles.