浅埋隧道超前支护措施对比分析

Comparative Analysis on Measures for Advanced Support of Shallow-buried Tunnel

浅埋隧道由于其埋深较浅、围岩稳定性差,施工中易出现拱顶不稳、变形大,甚至坍塌等工程事故,所以在工程上常采用超前支护的方式来提高围岩稳定性。对超前小导管法、超前管棚法、冻结法、地表注浆法四种超前支护措施的施工工艺和作用机理进行系统阐述,分析了这几种超前支护措施的适用性和优缺点。

Due to the shallowburied depth and poor stability of surrounding rock,the shallow-buried tunnel is prone to unstable vault,large deformation,even collapse and other engineering accidents in construction,so the way of advanced support is often used in engineering to improve the stability of the surrounding rock.The construction technology and the mechanism of action of four kinds of measures for the advanced support are systematically elaborated,including advanced small pipe method,advanced pipe shed method,freezing method and surface grouting method,and the applicability,advantages and disadvantages of various measures for the advanced support are analyzed.