中国铁道科学2025，Vol.46Issue(6)：99-110,12.DOI:10.3969/j.issn.1001-4632.2025.06.10
铁路隧道排水盲管结晶堵塞机理及喷射混凝土钙溶蚀研究
Research on the Crystallization Blockage Mechanism of Drainage Blind Pipe and Calcium Dissolution of Shotcrete in Railway Tunnel
摘要
Abstract
To address the issue of crystallization blockage of drainage blind pipes in railway tunnel,a loess railway tunnel project in non-karst area was taken as the background.First,the titration method and equipment such as nuclear magnetic resonance(NMR),X-ray diffractometer(XRD),inductively coupled plasma mass spectrometry(ICP-MS),scanning electron microscope(SEM),and energy dispersive spectrometer(EDS)were employed to test the types and concentrations of ions in water samples from different locations along the tunnel drainage path,as well as the mineral composition and microscopic morphology of crystalline deposits,thereby elucidating the crystallization mechanism.Secondly,the accelerated dissolution experiment was designed and conducted to analyze the variation patterns of pore structure,hydration products,and erosion morphology of shotcrete under the influence of NH4Cl accelerated dissolution.On the basis of this experiment,the blockage time of drainage blind pipe and the dissolution rate of Ca2+were calculated.The results show that crystalline deposits in drainage blind pipes of the tunnel mainly consist of CaCO3 with morphologies such as prismatic spherical,scaly,irregular square,and spindle shaped,which are primarily formed from the reaction of Ca2+dissolved from Ca(OH)2 in shotcrete with CO2 from the air.The dissolution of Ca2+leads to the increase in the number of micro-pores and mesopores in the shotcrete,exacerbating the formation of crystalline deposits and blockage issues.The accelerated efficiency in the calculated accelerated dissolution test is 14.4 times that of natural dissolution.Based on the fitting function of the Ca2+dissolution rate of shotcrete obtained from the relied project,the critical Ca2+dissolution rate without pipe blockage over any service life can be determined,and the specific time at which pipe blockage occurs in the tunnel can be inversely calculated.关键词
铁路隧道/排水盲管/喷射混凝土/结晶/碳酸钙/Ca2+溶出率Key words
Railway tunnel/Drainage blind pipe/Shotcrete/Crystallization/Calcium carbonate/Ca2+dissolution rate分类
交通工程引用本文复制引用
于本田,赵康康,杨玉祥,李盛,王天勇,白银银..铁路隧道排水盲管结晶堵塞机理及喷射混凝土钙溶蚀研究[J].中国铁道科学,2025,46(6):99-110,12.基金项目
甘肃省科技计划项目(25JRRA1161) （25JRRA1161）
中央引导地方科技发展资金资助项目(22ZY1QA005) （22ZY1QA005）
甘肃省基础研究创新群体项目(21JR7RA347) （21JR7RA347）
宁夏回族自治区重点研发计划项目(2022BEG02056) （2022BEG02056）
甘肃省自然科学基金资助项目(24JRRA233) （24JRRA233）
