长大隧道IV级围岩段全环开挖工法优化研究  

Study on the Optimization of the Whole-Circle Excavation Method for the Class IV Surrounding Rock Section of the Long Tunnel

作　　者：袁金波 YUAN Jin-bo(Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南理工大学,河南焦作454000

出　　处：《工程建设与设计》2021年第7期60-62,共3页Construction & Design for Engineering

摘　　要：针对长大隧道IV级围岩段采用全环开挖法是否安全稳定的情况,论文以某岩性为灰岩的铁路隧道工程为实例,对比同等条件下IV级围岩台阶法和全环开挖法2种开挖方式,分析隧道在支护条件下的围岩变形、围岩应力和围岩应变。根据各个方面数据对比,可以得出2种开挖方法的数据虽然有差别,但是相差不是很大,而且全环开挖法的数据优于台阶开挖法,数据也都在安全范围内。因此,仅研究在初期支护的情况下,长大隧道IV级围岩段可以采用大型机械化配套全环开挖法施工。In view of the safety and stability of the large-scale mechanized supporting full-loop excavation method for the grade IV surrounding rock section of a long tunnel,this article takes a railway tunnel project with limestone as an example,compared with the same conditions IV-level surrounding rock step method and full-loop excavation,and analyzes the surrounding rock deformation,stress and surrounding rock strain of the tunnel under the condition of support.According to the comparison of various aspects of data,it can be concluded that although the data of the two excavation methods are different,the difference is not very large,and the data of the full-circle excavation method is better than the bench excavation method,and the data are also within the safe range.So,only in the case of initial support,the large-scale mechanized supporting full-loop excavation method can be used for the construction of the IV grade surrounding rock section of the long and large tunnel.

关 键 词：大断面隧道 全环法 数值模拟 

分 类 号：U455[建筑科学—桥梁与隧道工程]