摘要
岩溶地区隧道工程普遍存在岩溶结晶阻塞排水系统的问题,严重威胁隧道工程的结构安全及其长期运营。文章在疏通岩溶排水堵塞的清洗溶剂制备与效能研究基础上,确定了清洗溶剂为浓度2000 ppm、重铬酸盐指数为17.71%的单分子羧酸类有机酸溶剂,并开展选定清洗溶剂对隧道衬砌结构混凝土与排水系统PVC塑料纤维材料的无损性测评。首先开展有机酸溶剂浸泡混凝土试件的试验,评估溶剂对混凝土侵蚀的强度损伤状况。其次开展有机酸试剂溶液浸泡PVC排水板与塑料盲沟管的试验,从宏观角度和微观角度评估溶剂对隧道排水系统侵蚀的质量损失状况和腐蚀损伤状况。试验结果表明:单分子羧酸类有机酸溶剂的侵蚀降低了混凝土材料强度指标约7%~9%左右,单分子羧酸类有机酸溶剂对排水系统塑料材料几乎没有腐蚀损伤影响。
Drainage system blocked by Karst crystal is often encountered in tunnelling in Karst area,threatening structure safety and long-term operation of tunnels.A unimolecule carboxylic organic acid agent with optimal con⁃centration of 2000 ppm and dichromate index of 17.71%is identified as a cleaning solvent based on a study of prep⁃aration and efficiency of cleaning solvent for removing of drainage clogging in karst tunnel,and a non-destructive evaluation of selected cleaning solvents on tunnel lining concrete and PVC plastic fiber materials of drainage system is conducted.Firstly,a test of organic acid solvent soaked concrete specimens is carried out to evaluate the strength damage of concrete due to erosion by solvent.Secondly,an experiment of soaking PVC drainage board and plastic blind ditch tube with organic acid reagent solution is carried out to evaluate the effect of solvent on quality loss and corrosion damage of tunnel drainage system from the macroscopic and microscopic perspectives.The results indi⁃cate that strength index of concrete material is reduced by about 7%-9%due to erosion of unimolecule carboxylic organic acid reagent,while it barely has any corrosion damage on the plastic material of drainage system.
作者
洪英维
HONG Yingwei(Nanchang Railway Survey and Design Institute Co.,Ltd.,Nanchang 330002;Communications Design&Research Institute Co.Ltd of Jiangxi Province,Nanchang 330200)
出处
《现代隧道技术》
EI
CSCD
北大核心
2020年第4期219-228,共10页
Modern Tunnelling Technology
基金
江西省交通运输厅科技项目(2015H0035)。
关键词
岩溶隧道
单分子羧酸类有机酸
衬砌混凝土
PVC排水管
塑料盲沟管纤维丝
结构无损性
Karst Tunnel
Unimolecule carboxylic organic acid
Lining concrete
PVC drainage pipe
Cellosilk of plastic pipe for blind ditch
Structural non-destruction
