| 引用本文: | 许宇,李兴高,杨益,牟举文,苏伟林.盾构切刀切削混凝土过程中的动态响应试验[J].哈尔滨工业大学学报,2021,53(5):182.DOI:10.11918/201905250 |
| XU Yu,LI Xinggao,YANG Yi,MU Juwen,SU Weilin.Dynamic response mechanism of shield cutter in concrete cutting[J].Journal of Harbin Institute of Technology,2021,53(5):182.DOI:10.11918/201905250 |
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| 盾构切刀切削混凝土过程中的动态响应试验 |
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许宇1,2,李兴高1,3,杨益1,3,牟举文1,3,苏伟林1,3
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(1.城市地下工程教育部重点实验室(北京交通大学),北京 100044; 2.中铁第一勘察设计院集团有限公司,西安 710043; 3.北京交通大学 土木建筑工程学院,北京 100044)
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| 摘要: |
| 为探究盾构切刀与混凝土的相互作用规律,开展室内切削试验,验证切削的实质是刀具与试件反复碰撞、挤压、切削和剥落的循环过程.通过切削力测试系统得到刀具前后角、刀具形状、切削深度和试件强度等因素对刀具法向切削力Fn与切向切削力Ft的影响规律,并分析得到各影响因素作用下Fn、Ft及切削合力Fc的波动范围.结果表明:刀具切削混凝土的实质是碰撞、切削、剥落的反复循环,切削力始终处于波动状态；刀具前刃面承担主要的破岩任务,前角越大,所需的Fn和Ft及其波动性越小,刀具对试件的拉剪效果越明显；Fn、Ft均值与试件强度和切削深度均呈线性关系,试件强度和切削深度越大,Fn和Ft越大,其方向上的波动性越小；切削深度比试块强度对Fc波动性的影响更为显著,切削深度越大,因剥离而产生的碎屑粒径越大,而刀尖处碎屑均呈粉末状. |
| 关键词: 盾构 切刀 混凝土切削 室内试验 切削力 |
| DOI：10.11918/201905250 |
| 分类号:TU94；TU455 |
| 文献标识码:A |
| 基金项目:国家重点基础研究发展计划(2015CB057802) |
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| Dynamic response mechanism of shield cutter in concrete cutting |
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XU Yu1,2,LI Xinggao1,3,YANG Yi1,3,MU Juwen1,3,SU Weilin1,3
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(1.Key Laboratory of Urban Underground Engineering (Beijing Jiaotong University), Ministry of Education, Beijing 100044, China; 2.China Railway First Survey and Design Institute Group Co., Ltd., Xi’an 710043, China; 3.School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)
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| Abstract: |
| To investigate the interaction between shield cutter and concrete, laboratory cutting experiments were carried out, which verified that the essence of cutting is the cyclic process of collision, extrusion, cutting, and peeling between cutter and specimen. The influence of tool rake and clearance angles, tool shape, cutting depth, and specimen strength on the normal cutting force Fn and tangential cutting force Ft of the tool was obtained through the cutting force testing system, and the fluctuation range of Fn, Ft and cutting force Fc under the influence of each factor was obtained through analysis. The research shows that the essence of cutting concrete with cutters was the repeated cycle of collision, cutting, and peeling, and the cutting force was always in a fluctuating state. The rake face played a major role in the rock breaking task, and the required Fn and Ft and their fluctuation decreased with the increase of the rake angle. The cutter with larger rake angle had more obvious pulling and shearing effects on the concrete. The mean value of Fn and Ft had a linear relationship with specimen strength and cutting depth. The larger the specimen strength and cutting depth were, the larger Fn and Ft were, and the smaller the fluctuation in its direction was. The effect of cutting depth on the fluctuation of Fc was greater than that of the specimen strength. The particle size of the debris increased with increasing cutting depth, while the debris at cutter tip was in powder form. |
| Key words: shield cutter concrete cutting laboratory test cutting force |
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