黑哑口隧道出口段围岩稳定性探讨

Stability of Surrounding Rock Mass at the Exit Portal of Heiyakou Tunnel

在隧道工程修建中,尤其在洞口段施工中,经常出现因围岩失稳而致的突水、突泥、顶板陷落、冒顶、塌陷等事故。影响围岩稳定性因素较复杂,有岩石的物理力学性质、岩体完整程度、岩体结构特征、地质构造、地下水情况、施工条件等,这些影响因素之间往往会相互制约,在一定程度上的叠加会加剧围岩失稳状态的演变。以黑哑口隧道为例,结合前人的研究结果,分析隧址出口段工程地质条件和水文地质条件,对隧道围岩完整性、稳定性进行分析探讨,以期为类似围岩稳定性研究提供借鉴经验。

In the tunnel excavations, especially in the construction of the portal segment, various hazards such as water inrush, mud inrush, tunnel roof collapse, and floor failure due to the adverse geological conditions, are frequently encountered due to the instability of surrounding rock mass. The factors affecting the stability of surrounding rock are complex, including physical and mechanical properties of bedrock, integrity of rock mass, structural characteristics of rock mass, geological structure, groundwater conditions, construction conditions, etc. these influencing factors often are often coupled with each other, and the superposition to a certain extent would aggravate the evolution of instability state of surrounding rock mass. This paper presents the Heiyakou tunnel as an example and combines with the previous research results. The engineering geological and hydrogeological conditions of the exit segment of the tunnel portal are presented. The paper analyzes and discusses the integrity and stability of the tunnel surrounding rock mass, in order to provide reference experience for the stability research of similar surrounding rock mass.