摘要
为研究盾构机掘进砂卵石地层时刀具的磨损机理,以福州某地铁盾构施工为例,分析原施工方案存在的问题及引起盾构刀具过度磨损的原因。为改善土壤性能,在每m3渣土中分别添加150 L泥浆和350 L泡沫;采用辐条式刀盘代替原面板式刀盘;采用主、副切削刀,主超前刀,鱼尾刀,盘圈贝型刀,周边刮刀等刀具,并优化刀具在刀盘上的布置。测量计算刀具磨损量及磨损系数,分析土压平衡盾构穿越富水砂卵石地层段的刀具磨损量与切削轨迹的关系。分析表明:优化后刀具的平均磨损系数由0.565 mm/km降至0.013 mm/km,优化后的方案能有效减小盾构刀具在富水砂卵石地层中的过快磨损,显著延长刀具使用寿命,有效提高土压平衡盾构机的施工效率。
Taking the shield construction of a subway in Fuzhou as an example,the existing problems in the original construction plan and the excessive wear causes of the cutters on the shield machine are analyzed in order to study the wear mechanism of the cutters when the shield machine is digging into the sand gravel layer.To improve the soil performance,150 L mud and 350 L foam per m3 are added to the residue soil.At the same time,the original panel-type cutter head is replaced with the spoke-type cutter head to optimize the tool arrangement on the cutter head,where the main and auxiliary cutters,the peripheral scraper,the main leading cutter,the fishtail cutter,the coil shell type cutter,the rim shell cutter and other tools are used.The tool wear and wear coefficient are measured and calculated to analyze the relationship between the tool wear and the cutting path of the earth-pressure balance shield machine passing through the water-rich stratum.The analysis shows that the average wear coefficient of the tool after optimization is reduced from 0.565 mm/km to 0.013 mm/km.The optimized scheme can effectively reduce the rapid wear of shield tools in the water-rich stratum,significantly extend the service life of the tools,and effectively improve the construction efficiency of the earth-pressure balance shield machine.
作者
韩伟
王余鹏
石端文
HAN Wei;WANG Yupeng;SHI Duanwen(Fujian Forestry Vocational College, Nanping 353000, China;China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430000, China)
出处
《山东交通学院学报》
CAS
2021年第1期65-72,共8页
Journal of Shandong Jiaotong University
基金
福建省中青年教师教育科研项目(JAT191258)。
