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由于地质构造作用以及风化作用,工程场地岩体中多存在围岩强度不均地段。在隧道施工过程中就经常遇到软硬岩石交汇而形成的地质条件复杂地段;给隧道的施工带来了很多不利情况,并且也是导致隧道塌方的原因之一。2006年1月,承德韩郭线二级公路工程,喇嘛梁隧道软硬岩石交汇地段由于地下水作用导致围岩风化程度不均,产生软弱结构面并造成了大面积塌方。基于现场的追踪调查与考察,本文详细描述了利用拱顶架设工字钢梁并配合超前注浆小导管的支护方法来处理这类围岩。
Due to the geological tectonics and the weathering effect, there are many sections of rock mass with uneven strength in the rock mass of engineering site. In the process of tunnel construction, the complicated geological conditions formed by the intersection of soft and hard rocks are often encountered. Many adverse effects are brought to the construction of the tunnel and one of the causes of the tunnel collapse is also caused. In January 2006, the Chengde-Hanjin-Guo Class II highway project and the intersection of soft and hard rock at Lamailiang Tunnel resulted in uneven weathering of surrounding rock due to groundwater, resulting in a weak structural plane and causing large-scale landslip. Based on the field investigation and investigation, this paper describes in detail the use of vault erection of I-beam and with the advance grouting small duct support method to deal with such rock.