暗挖隧道工程衬砌混凝土抗裂防渗性能应用研究  

Study on anti-crack and anti-seepage performance of lining concrete in bored tunnel engineering

作　　者：王德民 刘汉宏 纪宪坤 王海林 龚琛杰 徐可 WANG Demin;LIU Hanhong;JI Xiankun;WANG Hailin;GONG Chenjie;XU Ke(Wuhan Sanyuan Special Building Materials Co.Ltd.,Wuhan 430083,China;Hunan Provincial Transportation Planning Survey and Design Institute Co.Ltd.,Changsha 410200,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]武汉三源特种建材有限责任公司,湖北武汉430083 [2]湖南省交通规划勘察设计院有限公司,湖南长沙410200 [3]中南大学土木工程学院,湖南长沙410075

出　　处：《新型建筑材料》2023年第12期103-106,122,共5页New Building Materials

摘　　要：为研究暗挖隧道工程衬砌混凝土的抗裂性能,在某工程中进行验证。结果表明,采用纤维抗裂防渗复合材料制备混凝土具有良好的抗裂防渗性能,7、28 d抗压强度与基准混凝土基本持平,劈拉强度提高7.5%~11.4%,抗折强度提高11.6%~12.3%,抗渗等级从P8提高到P12。暗挖隧道工程实体结构二次衬砌混凝土在平均厚度450 mm时,应适当延长钢模板带模时间1~2 d或增加拆模后1~2 d内的保温养护措施,使降温阶段前3 d的降低速率控制在5℃/d以内,能够进一步降低早期温度收缩;实体结构内部早期温度修正后微应变最大值约为104με,2周后降低至-72με~-13με,早期较好的抗裂性能可有效降低非结构性收缩开裂的风险。In order to study the crack resistance of concrete lining in bored tunnel engineering,the test was carried out in a project.The results show that,the concrete prepared by fiber crack resistant composite materials has good anti-crack and anti-seepage performance.The compressive strength of 7 d and 28 d age was basically the same as that of control concrete,the splitting tensile strength increased by 7.5%to 11.4%,the flexural strength increased by 11.6%to 12.3%,and the impermeability grade increased from P8 to P12.The monitoring data of the secondary lining concrete of the solid structure of the underground excavation tunnel project show that when the average thickness is 450 mm,the time of the steel formwork with the mold should be extended by 1~2 d or 1~2 d thermal insulation maintenance should be added after the removal of the formwork,so that the reduction rate of the first three days of the cooling stage is controlled within 5℃/d,which can further reduce the early temperature shrinkage.The maximum microstrain value of the solid structure about 104μεafter the early temperature correction,and it was reduced to-72με~-13μεafter two weeks.The early good crack resistance can effectively reduce the risk of non-structural shrinkage cracking.

关 键 词：暗挖隧道工程 衬砌混凝土 纤维抗裂复合材料 抗裂防渗 

分 类 号：TU528.32[建筑科学—建筑技术科学]