聂崇欣, 饶军应, 刘建浩,等.隧道排水管道结晶体成分及结晶机理研究[J].河南理工大学学报（自然科学版）,2022,41(6):196-202.

NIE C X, RAO J Y, LIU J H, et al.Study on the crystal composition and mechanism of tunnel drainage system[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(6):196-202.

隧道排水管道结晶体成分及结晶机理研究

聂崇欣1, 饶军应1, 刘建浩1, 李元1, 王石光2, 谢财进1

1.贵州大学 土木工程学院，贵州 贵阳  550025；2.中铁十八局 第二工程有限公司，河北 唐山  063000

摘要:为提出有效的隧道排水系统结晶处置方案，以白岩脚隧道采集排水系统结晶体为样本，通过X射线衍射（XRD）分析结晶体物相，再用扫描电子显微镜（SEM）观测试样微观结构，并现场测量取样处pH和水温，研究隧道排水系统中产生结晶体物质成分和成晶机理。结果表明：白岩脚隧道排水系统中，结晶体物相成分为方解石（CaCO₃），水镁石（Mg（OH）₂）和白云石（CaMg（CO₃）₂）；按照结晶形态可分为附着生长型方解石结晶和搬运沉积型方解石结晶；结晶化学反应机理为去白云化结晶机理，结晶形成物质基础由衬砌和可溶岩共同提供，产生结晶的排水位置处pH为9.1～12.3。

关键词:白云岩;隧道排水;结晶机理;结晶形态;结晶物相

doi:10.16186/j.cnki.1673-9787.2020110019

基金项目:国家自然科学基金资助项目（51968010，51608141）；贵州省科技计划项目（黔科合基础［2016］1041，黔科合平台人才［2017］5788）；贵州省土木工程一流学科建设项目（QYNYL［2017］0013）

收稿日期:2020/11/05

修回日期:2022/03/10

出版日期:2022/11/25

Study on the crystal composition and mechanism of tunnel drainage system

NIE Chongxin1, RAO Junying1, LIU Jianhao1, LI Yuan1, WANG Shiguang2, XIE Caijin1

1.School of Civil Engineering，Guizhou University，Guiyang  550025，Guizhou，China；2.Second Engineering Co.，Ltd.,China Railway 18th Bureau Group ，Tangshan  063000，Hebei，China

Abstract:In oder to find effective crystallization disposition plan of the tunnel drainage system，taking the drainage system crystal material from Baiyanjiao Tunnel as the sample，the crystal phase was analyzed by X-ray diffraction（XRD），then the microstructure of the sample was observed by scanning electron microscope（SEM），and the pH and water temperature at the sampling site were measured in situ.The crystal material composition and crystal formation mechanism of the tunnel drainage system were analyzed and studied.It was found that in the drainage system of The Baiyanjiao tunnel，the crystals were divided into calcite（CaCO₃），brucite （Mg（OH）₂）and dolomite（CaMg（CO₃）₂）.According to the crystal form，it could be divided into adherent growth calcite crystal and conveyance deposition calcite crystal.The mechanism of crystallization chemical reaction was the mechanism of dolomization crystallization.The material basis of crystallization was provided by the lining concrete and the soluble rock together.The pH of the drainage place where the crystallization occured was between 9.1 and 12.3.

Key words:precipitation;tunnel drainage system;precipitation mechanism;crystallization dynamics;crystal phase

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