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  • 《日本科学技术振兴机构数据库（中国）》
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隧道建设（中英文） ›› 2023, Vol. 43 ›› Issue (5): 779-788.DOI: 10.3973/j.issn.2096-4498.2023.05.005

• 研究与探索 • 上一篇    下一篇

加压渗透下隧道喷射混凝土钙析出与水环境变化试验装置研发及验证

王合军1， 汤九科2， 刘禹阳2， *， 张鹏鹏3， 席龙龙2   

  1. （1. 中交路桥建设有限公司， 北京 101100； 2. 长安大学建筑工程学院， 陕西 西安 710061； 3. 河南省栾卢高速公路建设有限公司， 河南 洛阳 471009）
  • 出版日期:2023-05-20 发布日期:2023-06-20
  • 作者简介:王合军（1987—），男，河南濮阳人，2009年毕业于河南城建学院，道路桥梁工程专业，本科，工程师，现从事施工病害整治与项目管理工作。Email： 445764635@qq.com。*通信作者： 刘禹阳，Yuyangliu_lyy@chd.edu.cn。

Development and Validation of Test Device to Detect Calcium Precipitation and Water Environment Changes in Tunnel Shotcrete Under Pressurized Infiltration

WANG Hejun1, TANG Jiuke2, LIU Yuyang2, *, ZHANG Pengpeng3, XI Longlong2   

  1. (1. CCCC Road and Bridge Construction Co., Ltd., Beijing 101100, China;2. School of Civil Engineering, Chang′an University, Xi′an 710061, Shaanxi, China;3. Henan Luanlu Expressway Construction Co., Ltd., Luoyang 471009, Henan, China)

  • Online:2023-05-20 Published:2023-06-20

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摘要： 为探究隧道初期支护喷射混凝土孔隙渗透作用下钙析出规律与水环境改变特征，考虑隧道排水路径和加压渗透作用，研制隧道初期支护喷射混凝土钙析出与水环境变化试验装置，开展隧道初期支护喷射混凝土加压渗透试验，分析围岩水渗流作用下喷射混凝土渗透断面酸碱度分布特征，明确初期支护水钙离子体积质量与水质参数的时间历程变化规律，并与文献对比验证了装置的可靠性与试验结果的正确性。研究表明： 1）该试验装置由围岩水密封加压仓、初期支护喷射混凝土试件仓和排水管回液仓组成，可实现200 kPa加压渗透下初期支护喷射混凝土钙析出与水环境变化的模拟。2）渗流断面内喷射混凝土pH值降低，钙流失明显，钙析出流失引起的喷射混凝土劣化呈不均匀性。3）喷射混凝土渗透作用下初期支护水呈现高钙离子体积质量（大于100 mg/L）、高碱性（大于3 000 mg/L）、高pH值（大于11.5）和高可溶解性固体总量（大于8×10-6 mg/L）特征； 其钙离子体积质量与水质参数均经历1~4 h极速增大、4~18 h短暂稳定、18~68 h波动下降及68 h后基本稳定4个发展阶段，各阶段变化特征与试验开始时间、渗透水量与钙离子结晶沉淀相关。

关键词: 隧道工程, 试验装置, 喷射混凝土, 加压渗透, 钙析出, 水环境变化

Abstract: To investigate the calcium precipitation and change characteristics of water environment during pore infiltration into the shotcrete of tunnel primary support shotcrete, a test device is developed considering the tunnel drainage path and pressurized infiltration. A pressurized infiltration test is conducted on the shotcrete to determine the distribution of acidity and alkalinity under water infiltration into the surrounding rock. The change laws of the time course of the calcium ion concentration and water quality parameters of the primary support are determined and the results are verified by comparison with the literature to validate the reliability of the device. The following conclusions are drawn from the test results. (1) The developed test device comprises a watersealed pressure chamber placed in the surrounding rock, a specimen chamber placed in the shotcrete of the primary support, and a drain pipe as a return chamber. The device can simulate calcium precipitation and changes of water environment of the shotcrete of the primary support under 200kPa pressurized infiltration. (2) Lower the pH of the shotcrete in the seepage crosssection, leads to more severe calcium loss. The loss of calcium by precipitation deteriorates the shotcrete unevenly. (3) The primary support water under the action of shotcreting has high calciumion concentration (greater than 100 mg/L), high alkalinity (greater than 3 000 mg/L), high pH (greater than 11.5), and high total dissolved solids (greater than 8×10-6 mg/L); There are four stages in the development of the calcium ion concentration and water quality parameters: a rapid rise in the first four hours, shortterm stability during 4 to 18 h, fluctuating decline in 18 to 68 h, and stability after 68 h. The change characteristics of each stage are related to the start time of the experiment, the quantity of infiltrated water, and the precipitation of calciumion crystals.

Key words: tunnel engineering, test device, shotcrete, pressurized infiltration, calcium precipitation, water environment change

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