隧道洞口处巨型黄土老滑坡稳定性综合评价
Comprehensive evaluation of stability of giant loess landslide at tunnel portal
李鸿娟 1寇丹晖1
作者信息
- 1. 河南省第四地质勘查院有限公司,河南郑州 450000
- 折叠
摘要
为有效评价隧道洞口段滑坡的稳定状态,以隧道洞口处胡家村滑坡为工程背景,先结合其地质条件,通过数值模拟开展洞口段滑坡稳定性的初步评价,再以洞口段地表变形监测成果为基础,通过变形预测实现滑坡稳定性的预测评价,以保证滑坡稳定性评价结果的全面性.结果表明:隧道洞口处滑坡未见整体滑移迹象,整体稳定较好,但不排除在暴雨工况、地震工况或剧烈工程活动影响下发生局部滑坡的可能.在滑坡洞口段局部稳定性评价结果中,经数值模拟结果的初步判断,洞口段滑坡在不利工况条件下存在较大的局部失稳风险,尤其是在地震工况条件下失稳风险较大;经变形预测,验证了 FA-LSTM-CNN模型的预测能力,且得出洞口段滑坡的后续变形趋势等级为Ⅱ级,即后续变形的收敛趋势一般,稳定性会暂时维持现状,但不排除进一步减弱的可能,因此,需尽快开展洞口段滑坡的防治工作.
Abstract
In order to effectively evaluate the stability of the landslide at the tunnel entrance,taking the Hujia Village landslide at the tunnel entrance as the engineering background,a preliminary evaluation of the stability of the landslide at the tunnel entrance is conducted through numerical simulation based on its geological conditions.Then based on the monitoring results of surface deformation at the tunnel entrance,a prediction and evaluation of the landslide stability is achieved through deformation prediction to ensure the comprehensiveness of the landslide stability evaluation results.The analysis results show that there is no o-verall sliding sign of the landslide at the tunnel portal,and the overall stability is good,but it does not ex-clude the possibility of local landslide under the influence of rainstorm conditions,earthquake conditions or intense engineering activities.In the evaluation results of the local stability of the landslide portal section,based on the preliminary judgment of the numerical simulation results,there is a greater risk of local insta-bility of the landslide portal section under adverse working conditions,especially under seismic conditions.Through deformation prediction,the prediction ability of the FA-LSTM-CNN model has been verified,and it is concluded that the subsequent deformation trend level of the landslide at the portal section is Level Ⅱ,that is,the convergence trend of the subsequent deformation is general,and the stability will temporarily maintain the current situation,but further weakening is not ruled out.Therefore,it is necessary to carry out the prevention and control work of the landslide at the portal section as soon as possible.
关键词
黄土滑坡/隧道/数值模拟/变形预测/稳定性评价Key words
Loess landslide/Tunnel/Numerical simulation/Deformation prediction/Stability evaluation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据