大前石岭隧道进口岩堆基本特征及防治措施  

Basic Characteristics and Preventive Measures of Rock Heap at the Entrance of Daqianshiling Tunnel

作　　者：罗炬华[1] LUO Juhua(China Railway 18th Bureau Group Co.Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《铁道建筑技术》2024年第7期157-161,共5页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研发计划项目(2022-C24)。

摘　　要：由于松散岩堆体裂隙发育、稳定性差的特点,隧道下穿岩堆体易发生坍塌事故。为此,本文依托大前石岭隧道进口下穿岩堆体工程背景,从岩堆地貌、工程地质条件、岩堆稳定性三个方面分析了岩堆基本特征。基于先整体后局部的整治原则,提出了“岩堆加固+隧道加固”联合处理方案。通过现场监测隧道围岩变形及变形速率、隧道结构受力状态,评估了岩堆处理方案的合理性。研究表明,隧道进口段为松散的崩坡积层,考虑到隧道开挖对岩堆体的扰动,隧道施工安全难以保证;隧道施工过程中,围岩受力变形、钢拱架应力首先迅速增大,随后增速放缓,最终趋于稳定,说明所提出了“岩堆加固+隧道加固”联合处理方案合理科学。Due to the development of cracks and poor stability in loose rock formations,it is prone to occur collapse accidents when the tunnel passes beneath rock formations.Therefore,this article analyzed the basic characteristics of rock heaps from the aspects of rock heap topography,engineering geological conditions,and rock heap stability under the background of the Daqianshiling Tunnel entrance passing beneath rock heap engineering.Based on the principle of overall improvement followed by local improvement,a joint treatment plan of“rock heap reinforcement+tunnel reinforcement”was proposed.The rationality of the rock heap treatment plan was evaluated through on⁃site monitoring of the deformation and deformation rate of the tunnel surrounding rock,as well as the stress state of the tunnel structure.Research has shown that the entrance section of the tunnel is composed of loose landslide layers,and considering the disturbance of tunnel excavation on the rock mass,it is difficult to ensure the safety of tunnel construction;during the tunnel construction process,the deformation of the surrounding rock and the stress on the steel arch first rapidly increase,then the growth rate slows down,and finally stabilizes,indicating that the proposed joint treatment plan of“rock heap reinforcement+tunnel reinforcement”is reasonable and scientific.

关 键 词：隧道进口 大前石岭隧道 岩堆 基本特征 防治措施 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]