高速铁路富水黄土隧道隧底循环动载试验研究

振动与冲击 ›› 2010, Vol. 29 ›› Issue (9) : 226-230.

PDF(1229 KB)
PDF(1229 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (9) : 226-230.
论文

高速铁路富水黄土隧道隧底循环动载试验研究

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Cyclic dynamic test of water-rich loess tunnel subgrade for high-speed railway

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摘要

在高速列车循环振动荷载作用下,隧道仰拱和仰拱底部地基土中垂直振动速度和土压力沿深度的传递与衰减规律,是隧道设计不可缺少的重要参数。对于洞身位于地下水位以下的隧道,还需要考虑水压力的影响。国内外尚未见到有关这些问题研究的任何报道。依托铁道部科技研究开发计划重大课题,首次在富水黄土隧道内进行了模拟高速列车振动效应的循环动载试验,获得了不同加载频率下隧底垂直振动速度和土压力沿深度的衰减规律、恒定加载频率下不同深度的土压力变化规律、仰拱底部超静水压与不同频率下加载次数的关系。研究成果为隧道仰拱厚度和填充材料的优化设计提供了可能,为类似条件下隧道的设计和施工提供了试验依据和技术支持。

Abstract

It is an indispensable important parameter for tunnel design that the rules of transmission and attenuation for vertical vibration velocity and earth pressure with depth in arc of tunnel and soil bellow the arc under cyclic dynamic load of high-speed train. Effects of water pressure should be taken into consideration as for tunnels with most part below water table. There is no any report concerning these issues at home and abroad. Relying on important issues of scientific research and development plan of the Ministry of Railways of P.R.C, cyclic dynamic test that simulates high-speed train vibration effect has been put into practice in water-rich loess tunnel for the first time. Attenuation laws for vertical vibration velocity and earth pressure in and below tunnel invert arc under different frequencies are obtained. Changes rule for earth pressure at different depth under constant frequency are obtained. Relationships between excess pore pressure versus loading frequency and loading number are obtained and analyzed comparing with monitoring results. Research fruits provide possibility for optimizing design the invert thickness and filling materials of tunnel, provide experimental basis and technical support for design and construction of tunnel under analogous conditions.

关键词

富水黄土隧道 / 循环动载试验 / 垂直振动速度 / 动土压力 / 超静水压

Key words

water-rich loess tunnel cyclic dynamic test vertical vibration velocity dynamic earth pressure excess pore pressure

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高速铁路富水黄土隧道隧底循环动载试验研究[J]. 振动与冲击, 2010, 29(9): 226-230
Cyclic dynamic test of water-rich loess tunnel subgrade for high-speed railway[J]. Journal of Vibration and Shock, 2010, 29(9): 226-230

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