基于CaCO3析出影响的隧道初期支护力学性能试验  

Mechanical properties test of initial tunnel support based on the influence of CaCO3 precipitation

作　　者：蔡永洪 刘真 张黎明 罗旭琴 郑棚艺 CAI Yonghong;LIU Zhen;ZHANG Liming;LUO Xuqin;ZHENG Pengyi(Guizhou Provincial Highway Engineering Group Co.,Ltd.,Guiyang 550008,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;The 9th Engineering Company of Guizhou Provincial Highway Engineering Group Co.,Ltd.,Guiyang550001,China)

机构地区：[1]贵州省公路工程集团有限公司,贵州贵阳550008 [2]重庆交通大学土木工程学院,重庆400074 [3]贵州省公路工程集团有限公司第九工程公司,贵州贵阳550001

出　　处：《粘接》2025年第3期165-168,共4页Adhesion

摘　　要：地下水在渗流运动的过程中,会和隧道初期支护喷射混凝土接触产生碳酸钙结晶析出,使得初期支护喷射混凝土的力学性能下降,从而影响整个隧道初期的稳固性。为此,研究公路隧道初期支护力学性能。根据现场采集水样的离子构成,配置与隧道地下水主要离子成分相同的试验溶液,模拟地下水与隧道初期支护喷射混凝土接触后产生结晶这一过程。研究表明:(1)随着时间的变化,混凝土外观结晶量增大,结晶覆盖面积也逐渐增大;(2)混凝土中Ca+不断的析出,试样质量也不断降低直至趋于平稳;(3)试样的抗压强度不断下降,试样的平均抗压强度损失率也在不断地上升,最终逐渐地减缓;(4)试样的弹性模量平均损失值呈上升趋势,使得混凝土刚度下降,影响隧道结构整体的稳定性。In the process of seepage movement,groundwater will come into contact with the initial support shotcrete of the tunnel to produce calcium carbonate crystallization precipitation,which will reduce the mechanical properties of the initial support shotcrete,thereby affecting the stability of the whole tunnel at the beginning.Therefore,the mechanical properties of the initial support of highway tunnels were studied.According to the ionic composition of the water samples collected on site,the test solution with the same main ionic composition as the groundwater of the tunnel was configured to simulate the crystallization process of groundwater after contact with the shotcrete of the initial support of the tunnel.The results showed that:(1)With the change of time,the crystallization amount of concrete appearance increased,and the crystallization coverage area also increased gradually;(2)Ca+in the concrete was continuously precipitated,and the quality of the sample was continuously reduced until it tends to be stable;(3)The compressive strength of the sample decreased continuously,and the average compressive strength loss rate of the sample also increased,and finally gradually slowed down;(4)The average loss value of the elastic modulus of the sample showed an upward trend,which made the concrete stiffness decrease and affected the overall stability of the tunnel structure.

关 键 词：CACO3 力学性能 结晶时间 公路隧道 

分 类 号：U457[建筑科学—桥梁与隧道工程] TQ039[交通运输工程—道路与铁道工程]