影响含硫化物的地下工程围岩中锚固体系侵蚀的主要因素研究

摘要

The durability of shotcrete and rockbolt support system has direct influence on structure stability and operating life in tunnel and underground engineering projects with composite lining. Anchor system, which is mainly made of steel elements, is readily subjected to corroding. Based on the structural features of the tunnel and underground engineering project with composite lining, it can be deduced that the erosion of a bolt can be mainly attributed to the interaction between the anchor system and erosive underground water from wall rocks. In this paper, the dominant factors, influencing the erosion of anchor system of underground structure in sulfide-bearing wall rocks are discussed, especially the formation of erosive underground water in wall rocks and the physico-chemical mecha-nism for the erosion of a bolt under this condition are described. Based on this mechanism, and a method for estimating the operating life of an anchor system in sulfide - bearing wall rocks is proposed.%采用复合式衬砌的隧道及地下工程,锚喷支护系统的耐久性直接影响结构的稳定性和运营年限.锚杆主体属于钢构件,极易遭受侵蚀.从采用复合式衬砌的隧道及地下工程的结构特点可知,对于一定形式的锚杆,所遭受的侵蚀作用主要取决于锚杆与采自围岩的侵蚀性地下水的相互作用.本文探讨了含硫化物围岩中影响锚杆侵蚀的主要因素,描述了侵蚀性地下水的形成,以及锚杆侵蚀作用的物理化学机理,并提出了基于此机理的含硫化物围岩中锚杆使用年限的估算方法