针对渗流条件下的深埋富水隧道围岩稳定性问题,依托老獾顶隧道工程,对DK16+110-DK16+130段进行现场监测,采用流固耦合理论与反演理论,基于FLAC3D数值软件对该区段开挖过程进行数值模拟,与监测结果进行比较分析。研究结果表明:下左台阶开挖后两帮孔隙水压力梯度变化非常快,在仰拱开挖后应力与孔隙水压力变化趋于平稳;通过对孔隙水压力与应力的比值分析得到隧道围岩开挖风险预测函数α,确定了该地质条件下掌子面最危险开挖深度;当隧道围岩开挖风险预测函数值α>4.51时,掌子面极易发生失稳,需要对其排水降压;预测函数具有较高精度,为后续工程提供参考。
Abstract
To study the surrounding rock stability of deep buried water-rich tunnel in the presence of seepage, we conducted numerical simulation of the excavation process of a tunnel project in FLAC3D in consideration of fluid-solid coupling, and further compared the simulation result with field monitoring result. The comparison revealed that the gradient of pore water pressure changed rapidly after the left bottom sidestep was excavated, indicating that water burst would probably occur at both sides along with tunnel excavation; the stress and pore water pressure tended to be stable after the excavation of inverted arch. Furthermore, we proposed an excavation risk function according to α, which is defined as the ratio of pore water pressure to stress, to determine the most dangerous depth of working face excavation. When α is larger than 4.51, the working face is extremely prone to suffer from instability, indicating that drainage is required. The predicative function is of high accuracy, hence could offer reference for future projects.
关键词
隧道工程 /
流固耦合 /
反演理论 /
现场监测 /
数值模拟 /
预测函数
Key words
tunneling engineering /
fluid-solid coupling /
inversion theory /
field monitoring /
numerical simulation /
prediction function
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基金
国家自然科学基金委员会-神华集团有限公司煤炭联合基金资助项目(51174268)
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