岩溶隧道排水系统土工布结晶淤堵试验研究  

Laboratory Test Research on Crystallization of Geotextiles for Tunnel Drainage System

作　　者：张学富[1,2] 王铖 肖煜瀚 刘士洋 陈相阁 ZHANG Xuefu;WANG Cheng;XIAO Yuhan;LIU Shiyang;CHEN Xiangge(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Hubei Communications Yichang Expressway Operation Management Co.,Ltd.,Yichang 443000,Hubei,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆400074 [3]湖北交投宜昌高速公路运营管理有限公司,湖北宜昌443000

出　　处：《隧道建设（中英文）》2022年第S02期59-68,共10页Tunnel Construction

基　　金：重庆交通大学研究生科研创新项目(CYS21345);国家重点研发计划子课题(2021YFB2600103-01);在渝本科高校与中科院所属院所合作项目(HZ2021009);武深高速公路始兴联络线项目(WLX(202107)YS1-001)。

摘　　要：为解决隧道土工布结晶淤堵的问题,本文进行了室内模型试验,将现场土工布样品和试验样品进行SEM扫描电镜分析,对结晶体微观形态与土工布间的粘结方式进行研究,得到土工布材质、土工布单位面积质量以及土工布放置坡度对结晶淤堵的影响规律:1)在9种工况下,试验前7 d的结晶速率比余下周期快2.4倍,随后不同程度的减小;在相同的土工布材质条件下,单位面积质量为500 g/m^(2)的土工布结晶速率较300 g/m^(2)和400 g/m^(2)的土工布分别快99%和37%。2)土工布单位面积质量相等时,复合土工布表面结晶量少于长丝土工布和短纤土工布,但当单位面积质量增大到500 g/m^(2)后,长丝土工布表面结晶量反而超过另外2种土工布。3)在单位面积质量和材质都相同的条件下,当以坡度为0°放置时(拱顶位置),长丝、短纤和复合土工布的结晶量最大,分别为153.09、203.97、63.67 g,当以坡度为90°放置时(拱脚位置),长丝、短纤和复合土工布的结晶量分别为59.44、71.43、25.35 g,说明试验坡度将影响土工布结晶淤堵速率,放置坡度越平缓,结晶速率越快。To solve the problem of crystalline blockage of tunnel geotextiles,an indoor model test is conducted,and the on-site geotextile samples and test samples are analyzed using SEM scanning electron microscope.Furthermore,the bonding method between the crystal microscopic morphology and the geotextile is investigated.The influence of geotextile material,geotextile mass per unit area,and geotextile placement slope on crystallization blockage is as follows:(1)Under 9 working conditions,the crystallization rate in the first 7 days of the test is 2.4 times faster than the rest of the cycle,and then decreases in different degrees;under the same geotextile material conditions,the crystallization rate of the 500 g/m^(2)geotextile is 99%and 37%faster than that of the 300 g/m^(2)and 400 g/m^(2)geotextiles.(2)When the unit area mass of the geotextile is equal,the surface crystallinity of the composite geotextile is less than that of the filament geotextile and the staple fiber geotextile;when the mass per unit area increases to 500 g/m^(2),the surface crystallinity of the filament geotextile exceeds that of the other two geotextiles.(3)Under the conditions of the same quality and material per unit area,when placed with a slope of 0°(dome position),the crystallization amount of filament,staple fiber,and composite geotextile is the largest,which are 153.09,203.97,and 63.67 g,respectively;when placed with a slope of 90°(the arch foot position),the crystalline amounts of filament,staple fiber and composite geotextile are 59.44,71.43,and 25.35 g,respectively,indicating that the test slope will affect the crystallization of the geotextile.The smaller the placed slope,the faster the crystallization rate.

关 键 词：岩溶隧道 排水系统 土工布 结晶堵塞 

分 类 号：U45[建筑科学—桥梁与隧道工程]