隧道洞口滑坡综合治理与监测分析

Analysis of Comprehensive Treatment and Monitoring of Landslide at Tunnel Face

研究目的:受工程地质、水文地质条件及人为因素等的影响,隧道洞口在施工过程中容易发生洞口滑坡等问题,造成隧道进洞施工困难。结合青藏高原东部某隧道洞口的地质概况及滑坡特征,对滑坡体进行分区并对其稳定性进行相应的评价,提出具有针对性的滑坡综合治理方案,并对滑坡体和隧道结构进行系统监测和动态反馈。研究结论:(1)不良地质体在隧道洞口开挖前后的稳定性发生了显著变化,稳定系数存在不同程度的降低;(2)现场监测表明,对不良地质体、主滑体和隧道分别采取设置普通钢筋混凝土抗滑桩、锚索抗滑桩和加强支护等综合治理措施,使得坡体和隧道结构都处于安全状态,治理效果良好;(3)本研究成果可应用于隧道纵向穿越滑坡体的类似工程,具有借鉴和指导意义。

Research purposes： Because of engineering geologic condition, hydrogeological condition and some human activities, it is easy to result in landslide and construction difficulty at tunnel face. Taking into account the geological condition and the landslide feature of a tunnel in the eastern part of Qinghai - Tibet Plateau, the mechanism of landslide is analyzed in four aspects such as geological effect, construction impact, stress function and artificial factor and the stability of landslide is evaluated. Furthermore, a relevant comprehensive treatment design is put forward and the feedback monitoring data are dynamically analyzed and contrasted. Research conclusions：（ 1 ）The stability of bad geological body in tunnel portal excavation has changed significantly, and the stability coefficient is reduced in different degree; （ 2 ） The monitoring results show that the comprehensive control measures such as anti slide pile, anchor cable anti slide pile and reinforced support in the bad geological body, the slope and the tunnel are all in a safe state, and the effect of treatments is good; （3）The research results can be applied to the similar engineering of tunnel crossing landslide, with strong reference and guiding significance.