公路隧道围岩松动圈的测定研究
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摘要
为了研究公路隧道围岩松动圈的分布范围,以西施坡隧道地质资料和施工方案为基础,运用弹塑性理论计算和FLAC3D数值模拟相结合的方法分析公路隧道围岩松动圈的分布范围,并与围岩深部位移量测结果比对,得出西施坡隧道IV级围岩松动圈范围在2.0~3.0 m。分析结果表明,运用弹塑性理论计算、数值模拟分析、围岩内部位移量测相结合的方法可较为准确的测定圆形断面隧道围岩松动圈分布规律,并为公路隧道支护参数的选取提供较好的理论依据。
To study the distribution of loose zone of surrounding rock in highway tunnel loose circle,based on the geological data and construction program of Xi Shi Po tunnel,using a combined method of elastic-plastic theoretical calculation and FLAC3 D numerical simulation,the distribution of loose zone of surrounding rock in highway tunnel was analyzed,and the results were compared with those obtained from the measured deep displacement of surrounding rock.,It is concluded that the range of loose zone of grade IV rock of Xi Shi Po tunnel is between 2. 0 to 3. 0 m. Analysis showed that,using the combined method of elastic-plastic theoretical calculation,numerical simulation and internal displacement measurement of surrounding rock can more accurately determine the distribution of the loose zone,which provides better theoretical basis for the selection of highway tunnel support parameters.
引文
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