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在隧道施工中洞口的边、仰坡处理采用注浆锚杆对岩层进行加固,通过注浆,提高边、仰坡岩体的内摩擦系数;采用锚网喷来进行边仰坡加固,可防止地表水、雨水渗入边仰坡,增加围岩的不稳定因素,引起坍塌,影响洞内施工。本文通过陕西省小康高速公路大棕坡隧道工程实例,介绍隧道洞口长管棚超前支护的施工技术及施工时的注意事项。
In the process of tunnel construction, the grouting bolt is used to reinforce the rock formation on the sides and back slopes of the mouth of the tunnel, and the internal friction coefficient of the rock mass on the sides and back slopes is enhanced by grouting; Surface water and rainwater infiltrate the side of the slope, increasing the instability of surrounding rock, causing collapse, affecting the construction of the cave. In this paper, through the example of Dayampo tunnel project of Xiaokang Expressway in Shaanxi Province, the construction technology and construction precautions of advanced support of long tunnel of tunnel entrance are introduced.