悬臂掘进机在滇西红层隧道中的应用研究  

Application of Boom-Type Roadheader in Red-Bed Tunnel in West Yunnan

作　　者：朱廷宇 王唤龙[1] 宋智来 罗茂林 张磊[1] ZHU Tingyu;WANG Huanlong;SONG Zhilai;LUO Maolin;ZHANG Lei(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,Sichuan,China)

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《隧道建设（中英文）》2021年第3期458-466,共9页Tunnel Construction

基　　金：中国国家铁路集团有限公司重大课题(P2018G048)。

摘　　要：为解决滇西红层隧道支护变形风险高、单线小断面铁路隧道由于空间受限施工速度慢等问题,结合滇西红层以紫红色泥岩、砂岩为主,节理裂隙较发育,围岩强度适中等工程地质特征,依托大瑞铁路秀岭隧道进口平导,在滇西红层小断面隧道中引入悬臂掘进机施工,通过在适应性、设计参数等方面的深入研究,并与钻爆法在投资、施工进度、安全质量等方面进行对比分析,证明悬臂掘进机在滇西红层地区具有较好的适应性,具备较高的推广应用价值。应用研究结果表明:(1)悬臂掘进机适用于围岩强度适中、围岩(较)破碎、节理裂隙(较)发育以及地下水不(弱)发育的隧道;(2)悬臂掘进机对滇西红层围岩扰动小,初期支护可取消系统锚杆,并可以加大钢架间距;(3)悬臂掘进机在滇西红层隧道施工中进度优势明显,特别对于Ⅳ级围岩,进度较钻爆法提高了近67%;(4)悬臂掘进机早期资金投入较钻爆法高,且各级围岩条件下悬臂掘进机开挖单价为钻爆法的4~5倍。The support deformation risk of tunnel in red beds in west Yunnan is high,and the construction speed of single-track small cross-section tunnel is low because of space limitations.The geological conditions of red beds in west Yunnan include purplish-red mudstone and sandstone,developed joint fissures,and moderate surrounding rock strength.Accordingly,a boom-type roadheader is adopted in a small cross-section tunnel of the pilot heading of Xiuling tunnel on Dali-Ruili railway in red beds in west Yunnan.An in-depth study is conducted on the feasibility and design parameters of the boom-type roadheader,and it is compared with the drill and blast method in terms of cost,schedule,and quality.The results show the following for the boom-type roadheader:(1)Suitability for tunnels with moderate surrounding rock strength,broken surrounding rocks,developed joints and cracks,and insufficient underground water.(2)It mildly disturbs the surrounding rock of red beds in west Yunnan;thus,the system bolt for primary support can be eliminated,and the steel frame spacing can be increased.(3)Superiority to other methods in red beds in west Yunnan in terms of construction speed,especially for GradeⅣsurrounding rock,the boring speed can be improved by approximately 67%.(4)A higher early capital investment than the drill and blast method,with excavation cost per unit of approximately 4~5 times that of the drill and blast method.

关 键 词：悬臂掘进机 滇西红层隧道 适应性 设计参数 钻爆法 

分 类 号：U45[建筑科学—桥梁与隧道工程]